Volcanic Mishaps 1: Teneguia.

http://www.youtube.com/watch?v=pM9cIVYG15Y

Well, it was a day of mishaps, but thankfully not catastrophes, me n’ Lizzie arrived at Fuencaliente on the bus from Playa Cancajos and after a quick stop at the bar headed for Volcan San Antonio on the edge of town. Having recently walked the rest of the Ruta de los Volcanes we fancied a day that didn’t involve too much schlogging up hill…


It had a minor eruption in 1677 from two vents, one near the summit and one at the base; causing the death of one shepherd from asphyxiation, the loss of the Fuente Santa (Holy Spring) and the destruction of a few houses. 3 euros entry gets you a look round the small (but good) visitors centre and a walk around the ancient crater rim; it’s quite classic and well preserved.

This was where the first mishap occurred, it was a windy day, and Lizzie’s hat blew off and fell slowly into the crater, way beyond any hope of rescue… Which triggered off the second mishap; an attack of vertigo which meant that Lizzie didn’t get to see the view:


San Antonio was the preferred outlook for observing the 1971 eruption and some of the video was filmed from there. After mentally replaying the video and generally taking it all in, I collected Lizzie from her refuge and we headed on down for a closer look at the second most recent eruption in The Canaries.

This was a nice section of walking: two steep, quick, easy on the knees paths; one a steep switchback, the other a lovely “glissade” straight down. The paths were fine tephra (picon in Spanish) with a stretch of dirt road in between. Half an hours walking with pauses to empty our boots and we were at the base of Teneguia.

Lizzie decided to give it a try despite the earlier attack of vertigo, it’s not a manicured path and two thirds of the way up there’s a scramble with an unprotected, steep drop to the left, Lizzie wisely decided that if even if she made it up she might not make it back down…

This was the third mishap and since I am a Gentleman it was only proper that I escort my sweet love down and to a shady spot.

This is how the locals go down hill:

Having had a good swig of water and some jellybabies for instant energy I headed back up without my rucksack, which was nice because I carry the heavy stuff like 4litres of water etc. when we’re walking… All was fine until I took a nasty stumble (not a tumble or a plunge) and scared the bejesus out of myself; exactly where Lizzie had turned back… the penultimate mishap!

I made it to the top without further ado and got a nice view for my efforts:

http://www.360cities.net/image/view-from-teneguia-canary-islands#279.91,18.05,38.1

So, after some contemplation and gazing I headed back down to my sweet love and we took some time to decide how to get back up. We followed the dirt road back to the schwitchback path, and not fancying the alternative route (longer and via a main road with no pavement) we headed back the way we had come… After much cursing; the path is not only steep, but the picon; which is such a joy to descend, works against you climbing up: I guesstimate half a pace down for each pace up…we made it to the top.

We walked back through the town (still steep but paved) and stopped for a beer at a nice little bar by the bus stop. When I asked for “dos jarras grandes” he showed me two 2 litre glasses, to the great amusement of the locals… Explaining that we were waiting for the bus and had an hour’s journey ahead, I asked if he had something a little smaller!!! (To the great amusement of the locals)

So settling in with our pints of beer we chatted about the day’s adventure (it was months later that I told Lizzie about the penultimate mishap; she also suffers from vertigo by proxy!) and kept one eye on the bus stop, in case he arrived early. Five minutes after we got to the bar, a bus marked Faro (lighthouse) turned up… Hmmmm; which Faro would this be? A lightning deduction later and I began teasing Lizzie (who is in charge of the bus timetables) mercilessly; this bus had come from the lighthouse just down the hill from Teneguia!!! Regular service every day including Sundays… We could have strolled down, chillaxed for a bit and had a hairy but easy ride back to town…. The ultimate mishap!!!

Well; there you have one way to visit Teneguia, other options:
– It is possible to drive to the base of Teneguia, (via Volcan San Antonio) but do go careful with yr hire car.
– I would say best of all is to bus to/ park yr car in Fuencaliente: walk down and bus back up…
-Alternatively (of course) you can bus there and back from Fuencaliente, saving yr knees for the climb to the summit and putting a few more Euros into the island’s bus company; which is a co-operative; established 1952…

Disclaimer: La Palma is a volcano- hikers paradise, but the gradients and vertigiousness are challenging, be realistic about your abilities and do some research before you go, La Palma is the steepest island in the world; depending on how you calculate it, certainly in the top three…The driving is fair to middlin’ hazardous; which is why we let the locals take the strain x

Schteve n’ Lizzie x

References:

Photos, videos and 360 degree view as per the links.
http://transporteslapalma.com/transportes/index.htm is the bus company.

If you want to know whether you suffer from vertigo by proxy check here:

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150 thoughts on “Volcanic Mishaps 1: Teneguia.

  1. Thank you Schteve! I enjoyed reading it a lot.
    On the post.. The first Video just would not load. But checkit out, it is worth watching. And check the view from Teneguia, it is interactive!

    • Hi All.
      Just a flying visit as I am at work, glad you enjoyed the post, it was lovely for us to relive the day.
      Lizzie says she didn’t know about my stumble until she was reading throught the draft, I may have told her when we were drunk one time, to be fair…
      Thanks for editing it Spica looks really good.
      BBGN 🙂

  2. Thanks Schteve, loved the post. Not so sure about the Free Soloing video though. WOWWWW, I think my blood pressure rose just watching that. What a gifted young man.

    • Hey Newbie 🙂 How ya doing? Gifted? Not sure that is the right word. Unusual yes. I am not sure if he has the right genes for survival or is he is an ultra survivor. I just hope nobody tries to copy without the hours of practice and training he has opted to undertake. His hands and fingers must have incredibly developed muscles.

  3. Many thanks!

    In all likelihood, I will not have the opportunity to travel to any of the volcanoes that I read about, or make plots of and study the literature of.

    Allowing us this vicarious experience fills in the gaps that we would otherwise likely never enjoy. I think it’s a very good addition to the blog. 😀

  4. OT:

    Superstition is a belief in supernatural causality: that one event leads to the cause of another without any physical process linking the two events, such as astrology, omens, witchcraft, etc., that contradicts natural science.


    In statistics, dependence refers to any statistical relationship between two random variables or two sets of data. Correlation refers to any of a broad class of statistical relationships involving dependence.

    Familiar examples of dependent phenomena include the correlation between the physical statures of parents and their offspring, and the correlation between the demand for a product and its price. Correlations are useful because they can indicate a predictive relationship that can be exploited in practice. For example, an electrical utility may produce less power on a mild day based on the correlation between electricity demand and weather. In this example there is a causal relationship, because extreme weather causes people to use more electricity for heating or cooling; however, statistical dependence is not sufficient to demonstrate the presence of such a causal relationship (i.e., Correlation does not imply causation).


    The Redskins Rule is a trend involving National Football League games (American style football, with the oblong ball and lots of pads, helmets and neck injuries) and United States presidential elections. Briefly stated, there is a high correlation between the outcome of the last Washington Redskins home football game prior to the U.S. Presidential Election and the outcome of the election: when the Redskins win, the incumbent party wins the electoral vote for the White House; when the Redskins lose, the non-incumbent party wins. This coincidence has been noted by many sports and political commentators and has held true in every election since 1940, except for that of 2004.

    Curious about this… I took a look at the data and calculated the the Pearson’s correlation coefficient for the relationship. (true/false for each variable).

    In a perfect correlation relationship… you get 1.0. For absolutely no correlation, 0.0. Pearson’s looks for linear relationships, Spearman’s Rank correlation (rho) looks for any relationship. (even one based off of a curve) I only mention this as a sidenote, no Spearman’s rho was calculated.

    So… I was quite amazed that the correlation coefficient for this “Redskins Rule” was 0.89.

    That’s like… “WTF?”

    I can think of no reason for there to be a relationship… but the coefficient is there. Different coefficients have different meanings… 0.5 might be notable in social sciences, but generally, when you get into hard sciences or medicine, 0.8, or 0.9 might be more appropriate as indicating something.

    0.89… I’ll be damned.

    0.0 – 0.3 → Weak Correlation.
    0.3 – 0.7 → Moderately Strong Correlation.
    0.7 – 1.0 → Strong Correlation.

    BTW: The Redskins lost.

    • That is an approximately 0.0004% chance to get 18 hits (with “revised rule” ;-)) or 0.0008% for 17 matches.
      But if one multiplies with 32 teams (NFL) + 30 (Major League Baseball) + 19 (Major League Soccer) + 30 (National Basketball Association) + 30 (National Hockey League) = 141 teams, the a priori chance that any of those national teams achieve that exact result is about 0.1%.
      Times different conditions to choose from (e.g. first/last home/away game, etc.) you quickly arrive at single-digit percentage probabilities. Not so impressive after all. Especially since the correlation was “discovered” in 2000, so prior “predictions” don´t actually count.

      But everyone just loves superstition, like Germans Paul the octopus :-).
      http://en.wikipedia.org/wiki/Paul_the_Octopus

      But there still might be a causation, if the same people who manipulate the game outcome manipulate the elections 😉

      Cheers!

      • It’s still pretty wild… even if those damn reptile overlords are fiddling with the outcome.

        BTW, thanks for the combined probability refresher. I was able to duplicate your process all the way through!

        • Actually it helped quite a bit. It keeps me from perusing a statistical oddball that would have nagged at the back of my mind until I figured it out why there seemed to be a connection.

          This is one of those “fat tail” sort of artifacts that has to exist… but that you don’t expect. The same thing that makes people miss out on the reality that Black Swans are real.

          Carl would love this little exercise, it fits his idea that the area in the tail is actually larger than the region near the middle and should be much more likely than expected.

  5. Schteve, thank you for the post; an enjoyable read.

    The Free Soloing clip did not worry me, despite getting vertigo – odd 😕

    • Thanks Schteve, I also enjoyed your post.

      Karen, I had the same feeling with the clip, that this was ok, in spite of usually having some vertigo, I think it’s because the camera in the clip is positioned so that it looks into the wall that the guy is climbing and so you see the wall ahead of you. Whereas if you are standing on a path in a mountain wall, you look away from the wall and only see empty space. That’s when the vertigo gets baaaaaad…

  6. Thank you Schteve! I’m not that great at climbing, scrambling or even going up steep hills. I’m more of a look up at the mountains from the valley sort of person, so your post is very much appreciated. As for the solo climber – I cannot imagine the sort of person that can do that – it’s so beyond my experience. I once froze on a “cliff” approximately 3 ft high! It’s lovely to think there are people in the world who can climb so joyfully! 😀

  7. Lovely post Schteve and Lizzie!
    You have admirable perseverance despite all the mishaps. Me as a lowlander would fail epically on the first slope until I could get hold of a Harkonnen anti-gravity device.

  8. Thanks Schteve – really enjoyed that and had a good chuckle. I love to hear of other folks’ experiences – good and bad 🙂 (Every sympathy with Lizzie – vertigo has struck me a few times on mountains/cliffs and I just couldn’t move. A weird feeling without any logic)

    • Vertigo is not without logic, it´s protective:
      “… Some high-profile climbers have been killed free soloing, including John Bachar, Derek Hersey, Michael Reardon, Vik Hendrickson, Robert Steele, Tony Abbott, Dwight Bishop, Jimmy Ray Forrester, Jimmy Jewell, Tony Wilmott, John Taylor” (Wikipedia)

      • The problem with adrenaline junkies like this is not that they aren’t talented enough to *not* ever fall from the cliff, but rather that they only ever think about problems and errata within their own control.

        The same goes for Base Jumpers (the people who jump off a cliff only to parachute down henceforth). Most base jumping hobbyists are “addicts” to adrenaline inducing events, and from what I’ve read, most serious base jumpers generally know anywhere from 5 – 10 people who’ve been killed in the act of base jumping, yet they continue to do so anyway.

        But back to the problem of “things out of their control” – for someone like this who free solos a lot, they’ve likely climbed mountains hundreds of times with a rope and didn’t need any outside assistance, so they start on with some small free-soloing and then go up from there. But they rarely ever account for small other errata that is what typically causes people to fall off cliffs. Something such as a rock cracking away, or a suddenly strong gale of wind coming through at an inopportune time, or even something seemingly innocuous such as a bad headache or stomach flu while climbing are what causes death rather than the lack of ability or confidence in the ability to climb to such heights.

  9. Great post Schteve, thank you very much! I really love to read first hand experiences. Good things, bad things, together it makes a unique and interesting story.

  10. In the past, I have had to work up “on the stick.” That’s where my antennas were at. I enjoyed it quite a bit… but I always had a recurring nightmare of being at the top of a small lattice antenna with no easy way down and the bolts holding the section that I was on being loose.

  11. Thanks Schteve. I did enjoy reading that. It’ was so natural. . National Geographic adventures are all so “posed”. Even their problems look arranged. Your adventures I can empathise with!
    I too have frozen on a steep ledge in the lake district. Alan behind me gave me a shove. I nearly went Ar## over Ti~ but managed to stumble onwards without further mishap. Shaken and very stirred!!! Since that incident I seem to get vertigo much more frequently, even on top of my kitchen steps. ( I seem to be getting shorter and need these to reach the top cupboards) !!

    • “Seem to be getting shorter”

      My wife actually did get shorter. She used to be six foot… now she is like five foot ten or so. It has to do with aging and posture.

    • It’s odd what triggers it. For me it was going into a big ditch at 60 mph in the back of a Land Rover. Brought on a whole bunch of phobias that went quite quickly, but the vertigo (in certain circumstances) stays.

      • Interesting. I have been in what is politely termed a 747 incident. No problems flying but I am now a complete wreck in a cable car. Seems the fear has transferred itself 😕

      • I had a returning nightmare in my childhood – sitting in a car which drove up a mountain, on a road which got steeper and steeper until more than vertical (!) and the car fell backwords into the ravine. Driving on very steep, narrow mountain roads still can make me panic. Once I get out of the car, everything is OK.

        • We used to drive up what seemed like vertical roads when I was a child (it was in the bush and the roads were re-cut every dry season and had to cope with old lava flows, trees stumps and whatnot) so I class that as a ‘real’ fear. My phobia of caving, potholing and all things underground is not at all real as I’ve never been in a situation where I could get stuck. The very thought of potholing gives me the heebie-jeebies. I can go into well-lit caves and can survive a trip on the London Underground but usually emerge with a tension headache and in a really foul mood! I have nightmares of being stuck somewhere and the only way out is a really small space.

  12. Mornin’ everyone,

    just a quick activity update, Raung has just been confirmed to have been erupting after a Volcano Discovery team discovered the activity in the crater: http://www.volcanodiscovery.com/raung/news/21309/Raung-volcano-East-Java-strombolian-activity-observed-from-crater.html

    Another Indonesian volcano, Paluweh is still showing signs of activity: http://www.volcanodiscovery.com/paluweh/news/21432/Gas-plume-seen-in-satellite-imagery.html

    • Do you happen to know if there are webcams available?
      And i liked the interview with Dr. Boris Behnke and the last Bulletin. Wish we could ask his opinion on whats up with INGV and post it here.

      • Hello Spica,

        there are no webcams that I know of. Thanks for saying you liked the interview, makes it all worth it. I’ll try and contact Boris in the next few day’s and ask about the INGV.

        Hopefully i’ll get an interview with Clive Oppenheimer for next month.

        • Afternoon Lucas and All,
          Just wanted to say that I enjoyed the interview too, also thanks for the book list.
          Will let you know re the Teide book, the next in the series is to be about the Azores which is a mouthwatering prospect…
          Talking of books; just scored: Nyiragongo; The Forbidden Volcano by Haroun Tazieff, lavishly illustrated; First English edition, published by Cassell, ISBN 0304302295 in my local charity shop (thrift store in American 🙂 ) The price: £1.50… I nearly snatched his hand off!!!

      • I don’t blame you, I can’t quite figure out which fault plane is the one that slipped. They both look equally unlikely, oh hang on, I get it. Makes sense. Typical subduction thrust quake with the overriding plate jumping up (they solid yellow quadrant).

        • Got the yellow bit sorted (it was even aligned as I would have expected 😀 ) but have not got the white bit sorted – well not quite.

        • P axis denotes the quadrant where first motions are compressive. These are the regions where the seismo trace makes an initial upward swing. Usually a dot, or the white part of the ball.

          The T axis denotes the quadrant where first motions are in tension, (stretch). These are the regions where the seismo trace makes an initial downward swing. Usually a circle, or the shaded part of the ball.


          From what I can tell, this was an oblique reverse fault style of quake. That’s a combination of strike-slip and reverse faulting.

          Using the formulas in Wells-Coppersmith (1994) I get value of 2.02 meters max displacement, with an average of 0.71 meters. In reverse faulting their formulas don’t have 95% confidence. Using the “All Faults” formulas, you get 2.94 meters max displacement, with an average of 2.02 meters.

          The max surface manifestation is calculated at 19.4 to 206.8 km, but with a depth of 41.6 km and a down-dip rupture width of 26.55 km, I doubt that this quake showed up on the surface/seafloor as a semi-permanent movement.

  13. There were again some quakes at Torfajökull. http://www.vedur.is/skjalftar-og-eldgos/jardskjalftar/myrdalsjokull/

    I like the hiking path through Graenagil (a small canyon within its caldera) a lot http://isafold.de/sprengisandur96/img_laugahraun.htm (at the foot of the mountain to the right), but once, when I was there, the path had been gone at a point, disappeared under a small landslide. So it is good to watch your way there. Also, just in case, tell the people in the huts near the hot spring in Landmannalaugar about something like that. http://isafold.de/sprengisandur96/img_landmannalaugar.htm In my case, though a lot of people had taken this hiking path, I was the first to point it out to them.

    Nice article also on Torfajökull by the a.m. mentioned Mr. McGarvie (fine that you liked his article on Katla): http://davemcgarvie.wordpress.com/2012/05/18/torfajokull-waiting-in-the-shadows-7/ The geologist is a bit specialised in this matter, eg. : http://eprints.lancs.ac.uk/18/2/Microsoft_Word_-_Tuffen_et_al_2001.pdf And he interprets the quakes as magma movements, esp. under the western part of the caldera where there could be a magma reservoir. 🙂

    Sorry Inge, Akismet cleared this comment to Pending. I restored it. Spica

    • Oh how I love Torfajokull. Its a beautiful scenery there and it is a large caldera and nearly free of glacier to be explored by us, humans. Unlike Katla. And it is also the co-source of some of the greatest eruptions in Iceland, like Veidivotn (together with Bardarbunga).

      You can find plenty of extremely colorful rhyolite and hot springs, several lava fields, amazing canyons, plenty of obsidian, ice caves, and even pumice fields. Where else can you find such a mix?

      • But like Inge says it’s a place to tread carefully.

        I was there last September, just as the huts were closing for the year (before the winter), and for a few ocasions I felt I could have died there, while venturing in some icy slopes, without crampons. I was also surprised by a snowstorm where I was right at the center of the caldera, near Hraftinusker.

        But the view from there is gorgeous with the whole dead zone and Vatnajokull visible to the east, Hekla to the west, Myrdalsjokull and Eyjafjajokull majestic to the south, and the other large glaciers to the north.

    • Thanks very much for the Dave McGarvie links Inge. Looks like you’ve found another bookmark for my Symbolleiste (what’s that thing called in English?) to go alongside Erik’s and Chris Rowan’s.

  14. For those who wonder how HEKLA looks like in the top, here is a few photos:


    And a view to the lowlands down. Next volcano (mountains) in the horizon is Torfajokull

      • Yes, about 70ºC when you touch the ground. Because last eruption was quite recent (2000).

        In Eyjafjallajokull, I melted the rubber of my shoes in the fresh solidified lava. The rock (new ground) was probably 150ºC when I was walking over it. The lava was still liquid 1 meter below, a few months after the eruption, and it is still very hot in there 2 years later.

        In Krafla (eruptions 30 years ago) and at the Westman Islands you can find wide areas of warm ground that reaches usually 40ºC but larger at some spots. Basically if you touch a vent it will very hot. The temperatures can be often 200ºC a few meters below. My impression is that the lava stays very hot as some depth inside the volcano but near the surface, for many many years, cooling down very slowly.

        Even in Torfajokull or Reykjanes you can find warm areas near the site of their last eruptions 500 years ago, and 800 years ago, respectively.

  15. There appears to have been a bigish quake near El Hierro. The CHIE station is not working nor it seems is Las Palmas However something made a large signal early this morning showing larger towards the west . Here is Gomera signal. Nothing else is showing or has been noted so far.
    http://www.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=EGOM_2012-11-07&estacion=EGOM&Anio=2012&Mes=11&Dia=07

    On facebook the following comment from Enma Guedes
    Conred press conference: The President of the Republic, Otto Pérez Molina, indicates that INSIVUMEH recorded 19 replicas between 4.2 and 4.6 degrees on the Richter scale after the earthquake that occurred in the morning.
    I am not at all sure what is happening but I will try to find more references to this.

  16. A (preliminary) 6.3M earthquake hit 182km away from Port Hardy, Vancouver Island, Canada at a depth of 16km. Vibrations of the earthquake could be felt in the island, if you have felt the earthquake please write down on the “I felt it” your experience. A max. shaking of III-IV is expected.
    With thanks to Earthquake report. http://earthquake-report.com/

    • When they had that 7+ in the Queen Charlotte Islands I wondered if it didn’t wake that ‘ol
      Demon that lives under the Juan De Fuca…
      I do not use that term lightly-an 8-9+ would be far, far, worse than Sandy…

  17. Hi

    Here is the update on time lapse earthquake animation for iceland in TFZone up to 121107
    On the first part of the video elevation is shown
    on the following parts, the color of the dots denotes the age of the earthquakes (7 days max)
    Size of the dtos is proportional to earthquake magnitude.
    The moho is shown also.

  18. I’ve been reading into the Philippines / Luzon Volcanic arc quite a bit recently. It’s a really interesting area that’s similar to Kyushu in Japan, and Northern New Zealand in that it’s volcanically active area with a large cluster of super-sized caldera systems combined with a group of fairly explosive stratovolcanoes.

    (basic introduction to the area)
    http://www.agu.org/books/gm/v027/GM027p0157/GM027p0157.shtml

    The famous Pinatubo is one of the smallest volcanoes of this area, and this also includes the decade Volcano Taal. I would be interested to see of Laguna de Bay caldera (the largest, and central caldera in the map below) is still considered active, or if it’s dead as a doornail. It supposedly initially erupted around 1 million years back, but it was also said to have erupted another large-scale eruption approximately 30,000 years ago.

    I made a quick map through Google Earth and highlighted in pink the Large caldera systems in the arc. I didn’t highlight the small(er) calderas with the exception of the Pinatubo Caldera in the upper left corner. It’s amazing that such a large eruption only produced a comparitive blip of a caldera when looking at the other volcanic areas on the map..

    Is there any way to post the image directly in the post here (link below)?

    GL Edit: Not really, but I can do it for you.

    • ohh.. very cool. More juicy bedtime reading. Another region with loads of calderas (though I have never found any decent material on it) is New Britain.

      • eech… paywall. Does anyone know of a , cough, legal way of getting the full text.. I’m happy to pay but $25 seems a bit steep.

      • Guess it seems that Laguna is still at least somewhat active, albeit much less so than Taal.

        I searched for articles on lake Naujuan Caldera (which is the southernmost caldera in the region) and there was absolutely nothing listed anywhere. Naujan is not even listed in the GVP database anywhere.

        Similarly, the Batangas Bay Caldera has little to no research performed on it, and it’s only referred to in the GVP database as being a potential submarine caldera (although the AGU article more officially refers to it as a real caldera). Panay, a small andesitic volcano is likely a Somma of the Batanga caldera. With that said, the only particularly active system is Taal (and monitored for good reason) outside some fumerales in Laguna as Karen mentioned.

        I didn’t highlight the two volcanoes south of Pinatubo adjacent to Manila bay (Mariveles, and Natib), but they also have decent sized summit calderas, although they’re much less active despite their very large sizes.

          • I wish I were more knowledgeable on this subject. I’d like to think i’m better at bringing up questions than finding answers (see Tondano Caldera instance for example).

            Where is Carl when you need him?

        • Does not matter cubs, you are still much more knowledgeable than us and maybe some of your questions could even be answered in the discussion that will most likely follow such a post if it also asks questions.

        • Well… since cbus20122 is apprehensive to write a post on it, I will sweeten the pot by writing it myself. I’m pretty sure that the follow on discussion will fill in the blanks for what I miss.

          (BOSEG)

          • I can help out – I’m at work right now however, so writing an entire post will take a while.

            One thing that’s driving me crazy about the Philippines, is the nature of the subduction zones.

            First off, the entire area is a subduction zone logjam, with faults everywhere in between. Just look at the mish-mash of the islands, and you can see how fault systems have affected them.. it looks like they’ve been split into 60 different fractions.

            But more than just that, what really bugs me is how there are areas where it would appear that two slabs are subducting right into each other. This is a lot easier when you look at it visually here http://www.phivolcs.dost.gov.ph/images/active.faults/af_trench_with_capitals.pdf .

            I can’t begin to wrap my mind around what’s going on to the subducting slabs when they are subducting below the narrow strip of land.. Wouldn’t the subducting phillipine sea plate run into the subducting south china sea plate as they both subduct beneath the Phillipine islands?

          • The post is finished. As soon as Spica gives it the final look it will be available.

            KarenZ says:
            November 8, 2012 at 23:27 (Edit)

            From this, it looks as though the Philippines plate is being subducted under the Sunda plate.

            It gets more weird than that. 😀

          • Eh… It’s not a long post. But it gets the topic organized for better discussion and I always wanted to know more about Taal.

            Like I said earlier, I can get the framework out, I’m relying on the knowledge of the readers to fill in the blanks.

            As for writing under pressure… back when I was active duty, you should have seen me trying to write 12 performance evaluations with my Chief staring over my shoulder.

          • After sifting through tons of hard-to-read scientific journals (I’m not a scientist..) and paywalls, I came across a degree of more interesting factoids to add.

            Some interesting notes to take away from this paper and a few other papers I’ve skimmed through (what wasn’t paywalled at least)

            1. The island of Luzon (north island of the Phillipines) is largely defined by subduction related volcanism as one would expect, but also has an area of crustal extention and thinning (AKA, a rift zone) known as the Macolod Corridor. The Macolod Corridor is located in the southwest area of Luzon near Manila, and is occupied by the massive Laguna and Taal caldera systems.

            2. The island of Luzon sits on a island arc, sandwiched between two opposing subduction zones: The Manila Trench on the western side of Luzon, and the Luzon trench on the eastern side of the island. For a bit of perspective, if you were to take the state of Washington on the cascadia subduction zone – cut off the rest of america, then put another subduction zone on the other side of the state, you would get something similar. Wild, right?

            3. Between the two subduction zones, there lies an extensive north-south strike slip fault line.

            4. During much of the Pleistocene, the entire southern portion of the Luzon Island was covered in ash resulting from large scale eruptions. While tuff deposits have been discovered from Taal & Laguna, there are other large tuff deposits that have not been sourced at this point.

            5. Explosive volcanism has migrated from the northeast portion of the Macalod corridor (where Laguna caldera is at) to the southwest in more recent times (taal), which is speculated to be a partial result of a change in the angle of subduction of the western oceanic crust.

            6. I’m not positive on this one, but I believe that the thinned crust of the macalod corridor due to rifting caused largely by tectonic processes is combined with subduction oriented magma production – which creates a combo rift / subduction area. So that makes Taal and Laguna both rift as well as subduction zone volcanoes (although not traditional rift volcanoes as seen in africa, but still cool if true).

    • Frankly I don’t know what to make of it. And there’s the fact that there is no more earthquakes since 3 days. Also CHIE is down since Nov 2nd….

        • Hi Karenz and DFM,
          Egom in particular is showing a fair bit of red at 0.26 hz.
          http://www.ign.es/ign/head/volcaSenalesAnterioresDia.do?nombreFichero=EGOM_2012-11-08&ver=s&estacion=EGOM&Anio=2012&Mes=11&Dia=08&tipo=2
          I did pose the question the other night; could this be magma receding back down the conduits due to loss of pressure below? Tremor is caused by the interaction of moving magma with the conduit walls; presumably this would work in reverse?Therefore maybe the recent (and few) quakes that we’ve seen have been settlement; The GPS readings show some deflation too…
          http://www.ign.es/ign/resources/volcanologia/html/deformacionHierro.html
          Carl would probably know…

          • Yeah, should read “The GPS maybe shows some downward movement at some of the stations; according to ultra rapid data” 🙂

          • Lava flows down the side of the volcano when the lava lake empties or it is sucked out by rising magma elsewhere in the volcano’s reservoirs.

            Not heard of a lava lake draining to form a pluton – but am still learning.

          • Ah ha!! The famous disappearing magma trick. It certainly does happen, not only at Kilauea (where entire lava lakes go down the drainhole) but also volcanic edifices that deflate must signify, if not magma receding, at least a drop in pressure. Question is why?
            Possibilities that I can think of:
            1. rifting opens up space somewhere in the crust that is filled by magma.
            2. magma pressure itself opens up a sill to accomodate the mantle
            3. down sagging of the crust into the mantle reduces pressure in the system, which albeit slight is magnified in the small contained magma system (i.e. a tiny widespread movement at depth translates into meters of vertical movement in a lava lake with a relatively much smaller surface area)
            4. mantle plumes not only push up the crust but also pump up a magma system. When the plume runs out of steam the system collapses a bit.

            .. any other ideas out there?

  19. You have to hand it to the USGS. They have managed to take a highly functional web user interface and turned it into a very pretty, piece of crap.

    Most of the tensor data links yield blank pages due to malformed URLs, the thing is bogged down with superfluous java code…

    Yep… a very expensive bit of website coding that works like the pile of fecal matter that it is.

    Our tax dollars at work.

    • You’ve heard of the NHS uber- computer that cost £18 gazillion and never once went operational? The contractors bailed out with the excuse that it was too complicated…
      The Olympics: G4S contracted to supply so many security guards for so many £gazillion
      and totally failed to do so…
      Somehow both of these companies are still in business, and the govt are actually considering a tender from G4S for prisons or something!!!
      WTF?

    • The thing about Private Prisons that really bothers me… is that how much money they get depends on how many prisoners they have. Prisoners are their commodity. It is in their best interest, financially, to hang onto, or keep as many prisoners as possible. If a prisoner makes parole, that’s money lost.

      It would not be too difficult a reach, logically, to see that as a motivation to ensure that a difference of opinion occur at sometime during a prisoners stay… just to keep the population up and the money rolling in.

      Along those same lines… do you really think that a company that operates prisons would lobby for more lenient laws? Of course not. This sort of company would do everything it could to lobby for stricter sentences.

      After all.. more prisoners = A greater opportunity to make money by “caring” for them during their incarceration.

    • This short story is anonymized to protect people I know.

      A process server that I know, tried to serve foreclosure papers to a house in a nearby county. No one was home, and each time they went there, the dogs in the house were jumping up and looking out the window.

      Eventually, with this pattern going on, they contacted animal control/human shelter since there did not appear to be anyone there but the animals… locked inside. This was about a month ago.

      This week, according to the news, they found most of the animals dead of starvation. The decay stench is what alerted them.

      Now… why in the flying @#$@ didn’t they go investigate it when they were called?

      • I worry that I get more angry with human behaviour when animals are concerned than their behaviour to another human. I feel guilty. I DO care about people, but when I see mindless behaviour that causes suffering to animals, I get very angry.
        I work on the premise that if the people treat animals badly, carelessly and thoughtlessly they will do the same tothe humans in their society.
        I do admire the USA and other countries who give legal power to the animal welfare officers. We don’t have that here. The RSPCA and others rely on charity to do their work.
        They do prosecute but rarely.
        Lurking you have almost set me off on a rumination! However the phone is ringing and I need coffee #2

        My poor husband pushed open a gate, quite a posh wrought iron one hung on two large , tall pillars, a mark of wealth from the victorian days. As he pushed the gate open , so the pillars and the wall followed his energy and collapsed. Luckily only catching his elbow and arm. It could have killed certainly a small child!
        All was duly written in the accident book when he finished his post round.
        This morning he can hardly use his arm , so he phoned in sick, just until the swelling subsides. Nothing broken ,nothing any Doc can do it just needs a day or two to start healing. The phone has gone twice and messages left. “How long will you be off?” Can you just come in and sort the mail?”……… Now this harrasment makes me mad too! He went in on his day off on Wednesday to help them out. he does extras at Xmas time, the overtime pay is really not worth it, but he is a kindly soul and will help others.
        As soon as posties have a day off even after an accident at work, they are called in and given a verbal warning about absenteeism! Eric has cancer and still goes to work between chemo sessions. Even he got warnings!!
        My hubby actually likes the job and feels lucky to have one…..but long gone are the days of appreciation of loyalty at work.

        • Yes. But…
          There’s more voluntary work and donations for animals than for orphans or poorest / mistreated children. If what I read some weeks ago but can’t find any more was right. But it was in some kind of newspaper or news site, not on some madman’s blog or whatever – so should somehow have a bit of trugh in it. And I in fact know more people donating for animals than for human kids.
          That was not meant to excuse any bad treatment of animals. Touch my jack and you’ll see what I think and feel about that kind of stuff… Although some might doubt my feelings when they see me yell at it and pull it as it thinks it is a dominant rhino…

          • Good morning GeoLoco. Yes I read that too. Now why would a human prefer to spend money,time and affection on an animal and not on a small human? It’s pure selfishness on the part of a human. There has been many studies on the relationship between animals and humans.. This paper is most accepted at the moment and does explain in detail the suggested psychological reasons. basically the animal can give exactly what a human wants in an ideal relationship. Read on
            http://www.ehbonline.org/article/S0162-3095(99)80001-4/abstract

          • ….And since it’s Friday again and nearly Sheepy Dalek time…….This should get us all in the mood! Human/animal relationships? Jog on Sheepy!!!

            • Yes it is friday, i mailed with GeoLurking earlier and it is Ok if i update the post with the riddles later ( around the usual time) with the riddles.

        • And as I’m sort of “multitasking” and going fast I didn’t write my best wishes for your husband. I also think it’s our society’s decay when the value of an employee is not recognized as being more than only what a machine could do. We have very concerning cases and decisions going on where I work. Who has not had a burnout could do more, and as soon as someone had it he’s seen as week. It’s sad how things evolve.
          And cancer is a fucking bitch.

          • Oh! You mean the gatepost and wall? Again Nahhhhh! The mortar was rotten. That’s the trouble with old brick houses the bricks are strong but if the mortar crumbles, as it does, the whole structure collapses.
            It’s a good job we are not moving towards a subduction zone, rift or hotspot as most of our dwellings here in the UK would collapse!

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