# Images of El Hierros magmatic system

Image: GeoLurking, rights reserved. Basic triangulation, how to find a spot or a station

First, my qualifications. None. I have been a fan of geophysical processes and phenomena for the last 35 years. More so if you count the time spent hanging out in the archeological part of the library.

Image: GeoLurking, rights reserved. Margin of error from one station within one standard deviation

When an earthquake occurs, the energy from that quake travels directly to the seismic station. Granted, there is more to it than that, and it actually takes a curved path through the earth depending on the density of the material (refraction), but for our purposes it’s a direct path.

When an earthquake appears in a seismic catalogue, you are given the latitude and longitude of the epicenter, and the depth. The addition of depth turns that position report into a hypocenter, because it locates the quake in three dimensions. In the more detailed phase portion of the reports, you can obtain the arrival times of the quakes. Take the difference in arrival times for each station with respect to the event time, and you have how long it took for the quake’s energy to reach the station. Knowing the distance from the station to the quake, and you can work out the speed of that seismic wave.

Image: GeoLurking, rights reserved. The P-wave

This presents a problem if you don’t realize what you are looking at. The distance from the station to the quake, is usually seen as surface distance if you use a map. This is not the actual path that the wave took. Remember, it takes a direct path. How do you find it?

Geologists, and geological organizations, think in terms of central angle when discussing seismic events. This is the angular distance as measured from the center of the earth that describes the arc length on the surface between two points. I’ve mentioned AK135 before, in it you can find the expected arrival times for the various phases based on our current model of the Earth’s structure. All of its data is listed by the central angle. It is used to assist in identifying what each individual squiggle in a seismic trace represents. (Based on the path that particular portion of the wave took)

Image: GeoLurking, rights reserved. The S-wave

For the simplistic technique employed here, AK135 and the more advanced concepts aren’t really needed… as long as we remember that this is a simplified approach, and prone to error.

Treating the orientation of the seismic station and the quake as being two points on a slice of a sphere, the problem reduces to being a series of calculations on a circle. You have the chord, which is point from the seismic station to a point equidistant from the quake on the other side of the quake. That chord will have a height which is the distance from it to the part directly below the epicenter. Calculate that and you can then find the parts of a right triangle when you determine the depth of the quake in relation to the midpoint of the chord. Find the hypotenuse and you have the direct patch distance to the quake. If your eyes have glassed over by now, don’t sweat it. It took me three days to get the spreadsheet formulas down. Sometimes you just have to get up and walk away for a while.

Now that we have the direct path distance, we can calculate the actual P-wave and S-wave speeds. We can do something with that.

Before we do, I want to point out (yet again) that this IS NOT seismic tomography. That involves far more than our simple juggling of the geometry and data.

Image: GeoLurking, rights reserved. Preliminary image

P-waves are compression waves, much like sounds are a compression waves. The molecules move toward and away from the direction of travel. S-waves are transverse waves, they move side to side with respect to the direction of travel. The density of the medium that the waves travel through affects the speed of propagation, or how fast the waves moves. S-waves cannot travel through a pure liquid as S-waves.

When the rock density goes up, the difference in the speed betweed P and S waves grows smaller. With lower rock density, the speed difference grows larger.

Image: GeoLurking, rights reserved.

I’m not going to interpret what the plots mean. I’ll leave that to Carl and the others. But I will tell you what they are (it took me a few days to figure this one out). They are a plot of the speed field of quakes in a particular area. The quadratic surface interpolates the regions between the individual quakes, and shows you what a quake originating there should look like if one occurred there… based on the speed of the ones that did occur.

Like I said, it’s not tomography, but failing that, it’s about as good a representation of what is going down there that we can obtain as non geologists, based on available data.

Image: GeoLurking, rights reserved.

Since quakes occur over a period of time, these plots are a summary of what was observed over that period of time. In other words, they have very poor temporal resolution. Keep that in mind.

Other aspects of the plots show what would be expected from rising pockets of magma… compression of the overlying material, and a subsequent decrease in the speed difference of P and S waves.

Image: GeoLurking, rights reserved.

The unnerving part of these plots, and why I was apprehensive about releasing them, is that they dovetail well with anecdotal information about the dynamics in play.

Image: GeoLurking, rights reserved. The original image that started the discussion. Here we can see what might be a magma chamber, and the feeder tube that goes down into the deep. Location of the inferred magma chamber is below Tanganasoga volcano.

Again, my standard caveat: I am not a geologist and am not trained in that field. I could be very wrong in my methods. Take it with questioning view, which is sane way to look at it.

GeoLurking

Afterword: Peer review

In science when you wish to publish something new, you send the paper in and then a review-board reads it through, and either it pass and becomes published (often after revisions), or not.

Since this is something that can affect a lot of peoples lives the author wanted the post checked. So, here is how the peer review was done.

First I picked a part the reasoning, and then I looked if I would get the same result. I also went through  the physics of it to see that it checked out.

Then the paper was sent to an engineer in the oil industry that works with tomography on a daily basis. And he found it to be correct.

After that I started to think about what other ways one could “see” what the author had found. So I deduced that the quakes that are smaller then 2M are just hiding the real action. So I tricked KarenZ and Ursula into plotting that, and guess what, the same structures showed up again. For those who follow the comments in here, those plots are there to be viewed.

I guess there are more ways we could have checked it, but in the end, I wished to publish this before the volcano became demented with old age.

CARL

## 490 thoughts on “Images of El Hierros magmatic system”

1. GeoLoco says:

I allow myself getting on with the thinking about a phrase that would be ours and still quoted by future generations.
When penguins walk across the yard,
the winter will be very hard.

• GeoLoco says:

Who pees against the wind might need a towel.

• GeoLoco says:

Fog on the sea, go have a tea.

• GeoLoco says:

when sheep are looking happier, the weather won’t be better.

• kenpea says:

You’ve been busy! lol

From my experience on the mountains….

when sheep are looking happier, the weather will be crappier.

Sorry. 😉

• GeoLoco says:

Nonono, don’t be sorry, that is much better! That’s the awful thing when you’re not writing your mother tongue. Thanks a lot.

Hell of a container ship you had to deal with… 🙂

• kenpea says:

It wouldn’t move out of the way, but they never do…..

I didn’t sail too close!

• GeoLoco says:

Container ship ahead – you better stay in bed…

• kenpea says:

Everyone seems to speak English much better than us lazy English speak other languages. 😦

• GeoLoco says:

That probably makes english the worst spoken language of the world… 🙂

(so many use it even if they don’t do it well)

2. kenpea says:

Carl, the only way to learn to drive a car like that is from a racing driver on a track. There is so much power and handling that otherwise goes to waste….

Me in an earlier life. I could get in, but I doubt that I could get out of the cockpit these days!

• kenpea says:

Wrong reply box again, thought I’d cracked it….. 😦

That was re Carls Koenigsegg.

• Carl le Strange says:

I loved that the car was crashed in the front.
Cool, so you’ve been a race-driver?

• kenpea says:

Most of my cars end up with the odd crunch here and there. 😉

Just Formula Ford, and just local for a short time (I live between Donington Park and Mallory Park tracks). I like to change my life on a regular basis. I’ve also been a coal miner, had a business repairing cameras (35mm mainly), been a climber, a sailor (maybe not much longer:( ) and had 2 divorces – so far! 😉

• My wife is not too keen on the sailing either 😉
I’m still working on it.

• Carl le Strange says:

It is not to late for another wife or two… 🙂

• ha. nah, I’m keeping this one!

I guess the sailboat is going to be a small one for one Dad and one son. small boats are anyway more fun (and way less expensive)

3. Carl le Strange says:

And as a favour to GeoLoco, I will go Ovidian!

• GeoLoco says:

Learn to drive it, because “volvo, ergo sum”…

• Carl le Strange says:

Veni, vidi, volvi….

I came, I saw, I roled…

• Peter Cobbold says:

carl, no way – you wont do that. The throttle goes both ways.
Once you’ve power-slid the tail out,briefly, once or twice on a track – in safety – you’ll know where the limits are. And you wont get up there on public roads – you dont come across as a hooligan on here.

• Carl le Strange says:

Problem is that I do not really like cars… I bought the car because I wanted a swedish car, and Saab is dutch and Volvo chinese… So it kind of got out of hand. 😦

• Peter Cobbold says:

I have to confess to being a petrol head. Not a modern image – but old enthusiasms die hard. I had a project in mind to ‘dual fuel’ my old supercharged TR, then the E85 fuel was taken off sale. So much for DIY engineering for both power and economy…

• I do not like their copyright – wrote them an Email to use the pictures for a non-profit foundation …… and as pexpected, NO answer yet (guess that is Yes)

• Carl le Strange says:

Under EU law any picture produced by any state or EU funded agency is common property. That also goes for all their data. So it is free to use… 🙂

• You may add one sentence to your letter: If you agree, do not answer. If you do not agree, let me know within one week.

4. I can now reveal that I am the answer to British Stealth attacks. Here I am being trained last year. I am about to take control of the power base. A very large Kite. The metal buggy can slip under the enemies’ surveillance. Kites could be the answer to taking good photos of the centre of Bob’s Jacuzzie. I am not volunteering.
PS Yes! my legs very rarely see the sun these days!

• kenpea says:

Cool! Never tried that….

I’ve seen sailing video taken from from a camera attatched to a kite flown from the boat, might try that one day.

• GeoLoco says:

We have the “miss november” page of our 2011 calendar.

• Rofl! Mr Pirelli eat yer heart out! How about we run a competition for the 2012 Volcano Cafe Calender? Any subject ,male, female,animal, vegetable or mineral as long as it is loosely connected to the subject of volcanoes. Only 2 rules
1) The photo must be of or taken by the person submitting the photo.
2) Anything goes!

• According to some sites this may be the last chance of such creative work as there will be no need to think about a 2013 calendar.

• kenpea says:

I’m up for it! lol

Rock included for possible volcanic qualification. The rock behind me was one I sat on earlier……

• Newby says:

Kenpea,, You shouldn’t say things like that, coffee and Keyboards don’t mix well.
A little tip, if you spit coffee on them turn upside down immediately. Usually works, although i am on my second keyboard this year.

• Love it!!! Mind you it looks as though you are about to head out to sea on the wings of a strong easterly. Your presence here assures me this was not actually the case.

• kenpea says:

It was on the Isle of Arran, and it was very windy!

We’ve still got 10 months to fill. 😉

5. We also do a mean version of stealth here in the UK..

• Just the ticket for creeping up on erupting volcanoes without arousing suspicion!

• What a lovely lawnmower!

6. Newby says:

Look at la Restinga webcam now. The middle one shows a lot of material floating on the sea but the lower one has just started showing what looks like a new jacuzzi, can anyone else see it?
A white pastch to the left of the picture and close to the edge. Wasn’t there half an hour ago. Wonder if it is a new vent?

• Newby says:

Drat! Now they have changed the view. Still the ship that is there should know if it is on not.

• Ursula says:

Was going to check, but I can’t, because it’s just happily buffering, buffering, buffering….
If you see something cool, would you mind taking a screenshot and putting it up on tinypic, please?

• I may have missed an explanation whilst I was away…but what is that mound of earth to the left of the view of La Restinga town. It looks like a small ash cone! Cars keep driving up and down it. I am sure it wasn’t there last week when I left. Maybe the camera angle has changed since last week.
http://www.hierroendirecto.movistar.es/

• Carl le Strange says:

I have not a clue… I do not remember having ever seen it before.
Mysterious, wonder what Armas is up to now. Going to fill up the volcano?

• KarenZ says:

It’s OK; it is a cinder cone, which shows very clearly on Google Earth.

• ovejamecanica says:

It’s there on giggle earth,

probably a good place to view the activity !

• Latest pictures Ursula. There seems to be more bubbles in front of the main jacuzzi and I also can see another light patch to the right side. The boat is between the older light patch and this newer one.

7. Carl le Strange says:

Under EU law any picture produced by any state or EU funded agency is common property. That also goes for all their data.

• Carl le Strange says:

And this ended up wrong…

8. Richard says:

Screen grab of a ship examining the area; 11:20am

• Carl le Strange says:

Have never seen that one before… Anybody that know what ship it is?

• kenpea says:

On Armand’s site there is a suugestion that it’s the Poseidon, but it looks different to me.

The Poseidon…..

• Carl le Strange says:

It is SARMIENTO DE GAMBOA (Dredger)
Current location: Hierro

9. Carl le Strange says:

What in the name of all Hork is this???

SARMIENTO DE GAMBOA (The Ship) is a dredger built in 2006, 71 meters long and weighing 850 tons.
If I combine that with Dianas new mound of dirt I get the horrible feeling that they have decided to try to fill in poor little Bob. Unlikely to succeed, and if the do succeed it would be to ask for a disaster… I hope I am dead wrong here.

• Carl le Strange says:

The mound to the left on the El Restinga cam…

• eyeofskye says:

Quick setting epoxy glue?

• I would like to make a public announcement that that Mound is not mine and I will not be held responsible for whatever is happening. 🙂

• new tourist attraction for when Bob stops erupting: artificial volcano made of Bob’s sediments, replete with built-in jacuzzi on the harbour front. Entrada € 10. Webcams will be trained.

• KarenZ says:

The mound shows very clearly on Google Earth.

• How can they be so fast? 🙂

• GeoLoco says:

Naaaaaah, no one would be THAT silly…
Come on, they juste want good samples…

• GeoLoco says:

But what a joke of the century if anyone began filling up an erupting mound. That would just be the most behorked BOSEG ever done as a reaction to volcanic activity.

Somehow now I hope they will go for that… 🙂

• Peter Cobbold says:

Perhaps it is tippping soap powder in to liven up Bob as a tourist attraction?

• Lughduniense says:

here’s the ship: SARMIENTO DE GAMBOA
Doesn’t look anything like a dredger to me:

10. kenpea says:

And again the AIS is switched off…..

• The mound was just inspected by a helicopter.

• kenpea says:

Thanks Sissel, I’ll have a look now. 🙂

• kenpea says:

Good site, I’ll keep that one, but no sign of the ship again!

• No, I think they switched off the AIS shortly afterwards and never turned it on again.
Maybe tomorrow, as they will stay for two days according to diario el hierro.

• And there is Sarmiento again – further out, you can see it on the wabcam (and on localizatodo).

11. KarenZ says:

A very belated Great Plots to GeoLurking. Apologies for the delay, I have been getting my head round the maths (slow because it is a long time since I did maths) and trying it out on a few quakes myself. The maths I can now cope with, but manually extracting EQ phase data from IGN’s text files is not for the faint-hearted.

GeoLurking deserves several medals for the effort he is putting in on this.

@GeoLurking: on the very small sample of EQs I looked at, I noticed that a few for CHIE did not have arrival times for the P waves. Is this because the P wave data is lost in the harmonic tremor?

• Peter Cobbold says:

Now I see why the PS time difference was not plotted for each eq and displayed clour coded in a 3D swarm. Hence the use of the quadratic surface etc that I found so confusing?
Manual extraction – could we all work together and do all the eqs as a ‘distributed processing’ project? Scoop IGN- with its own data!!

• KarenZ says:

I thought about trying to do it electronically but the download time was taking too long, indicating that it might be using too much IGN server time. So I aborted the download as I did not want to be held responsible for slowing down IGN’s servers. Multiple users on the site would have a similar effect.

So great idea but neither IGN nor the people on El Hierro would thank us if we stopped them from analysing critical EQ data.

Unless of course Carl or Lurking have a better way of getting hold of the data?

12. sake says:

hey,
I’m following this and jon’s blog a while, very informative!
I saw a video on youtube which i found interesting.

I know it has to do with steam and pressure but the actual fhysics behind it i don’t know.
p.s the one who uploadded this video has also very spectacular videos about lavaflows,
see the right side on the youtube movie (my fav is etna)

13. Una Canaria says:

Here is the ship Sarmiento de Gamboa.

• Hello Una!
The ship must have passed at least twice today then, because here it goes from W to E, and on the picture from localizatodo it goes from E to W.

• Una Canaria says:

• Una Canaria says:

I know that the boat will investigate both the north and the south side ofHierro (gravimetry and something more )

• Una Canaria says:

And bathymetry, that´s the word ( damn memory!)

14. granite1 says:

If you go back to ER page (Armand) you will find a clickable link to the boat – a new oceanographic research vessel, 2004, crammed with all sorts of equipment. The dredger must be some other boat of the same name.

15. Una Canaria says:

Sissel, how are your eyes? 🙂

• Haha, they are fine at the moment, but I made some small mistakes again – never underestimate Jalapeñjas!

• Una Canaria says:

Someday you should try the pimientos de La Palma ….

• Una Canaria says:

I will not say its name because it is an ugly word, but I think they are even more spicy jalapeños.

• If someone would send me a couple of seeds I would like to try growing them (hint)!

• Una Canaria says:

I will send you a couple of kilos. 😈

• Lughduniense says:

Pack some sun with the peppers as well before sending it, Una, the ‘jalapeños’ need the heat of the sun to absorb the heat for the tongue… That’s why peppers from tropical regions are hotter…

• I have to tell you that the peppers from my garden are V-E-R-Y strong! In spite of the latitude of a little more than 50 degrees N.
They may be used on the Burfell party BBQ. You will never forget.

• Newby says:

No, try naga chillies, wow! Flaming and never forgotten.

16. eyeofskye says:

Can anyone confirm if this is true?
In heavy snow storms cattle put their noses into the wind and walk till they get to an obstruction they can shelter behind. Sheep on the other hand put their behinds to the wind and walk until they get to an obstruction where they get buried.

• GeoLoco says:

Let’s raise our hands up in the air and wait for Diana’s enlightment…

• Inge B. says:

In Iceland in the winter time, it’s possible that sheep get buried in snowfilled ditches, this happens every year. They seem to seek out the shelter of ditches in the storm (not a lot of trees in Iceland), and when the snow comes, it can bury them.

In the northwest of Iceland, near Hólmavík (Westfjords), there is a museum specialised in sheep breeding. On their webpage, they are talking about different kinds of danger for sheep (rollur in Icelandic – pron. rodler], among others that they would die in the snow (= fönn – Í óveðrum á haustin er alltaf hætta á að kindur fenni.). http://strandir.is/saudfjarsetur/frodl-kindin7.htm

Could be an interesting excursion to go to this museum, it’s a beautiful region there, too. http://upload.wikimedia.org/wikipedia/commons/1/15/Dj%C3%BApav%C3%ADk.jpg
I know the museum well, when I went there first, some years ago, the explanations were just in Icelandic. Being a guide, I talked to the people there about it, that it would mean additionnel income to have also guests from foreign countries. They first thought, it would perhaps not be very interesting for them, but I insisted – it is, as we here know best.:) And last time I was there, they had also explanations in English.

By the way, there is another interesting museum at Hólmavík, the museum of sorcery, because the inhabitants of the Westfjords esp. in the Middle Ages and till the 17th century were known for their witchcraft. http://upload.wikimedia.org/wikipedia/commons/d/dd/H%C3%B3lmav%C3%ADk_1.JPG

• Woomf says:

Anyone who has ever owned sheep must know that they have an inbuilt death wish! … and where one goes the others follow.

• @ Woomf. That is why they have a sheep called a Jacob sheep. This sheep is used to lead the sheep that are to be killed into the slaughter house. The Jacob calmly walks in and the other sheep follow without panic. A sad fact but true.

17. Una Canaria says:

What a strange question ….

• eyeofskye says:

You’re posting on this site and you consider this a strange question 😯

• Do not know but I suppose the sheep have found the most intelligent method to build a fitting iglo which protects them against the storm 🙂 .

• Una Canaria says:

Oh, I see … you say for the love you have it to the sheep 🙂

• So THAT is how it goes! Mapping Bob. Nice clip!

• Peter Cobbold says:

Perhaps if they’d done that four months ago we’d have a ‘before’ scan for comparison.

18. Looks like more action on the webcam again, but I can’t get the zona de Erupción.

• Una Canaria says:

Yes, you can see the bubbles!

• Yes that is the best one, it always works. But I wanted to look closer to the shore and more to the right – but that cam keeps connecting all the time. Hrrrmmf.

• Una Canaria says:

But sometimes appear and sometimes disappear,I do not know why.
Maybe it’s the start of something bigger.

• Newby says:

Now what is that showing on the lower cam, a boat?

• Newby says:

Well no boat as it has gone again. It looked again like a fiery fountain but I suppose must have been a trick of the light, it is so difficult with the bright light when it shines on the sea.

• Newby says:

Oh dear, I wonder if I have been fooled by that annoying light refraction on the lens. Sorry folks.

• Una Canaria says:

What a shock! I was already going crazy looking for the boat

19. Newby says:

Bubbling now showing on the top screen of this site.
http://earthquake-report.com/2011/11/12/32535/
I also saw what I thought was a sailing boat on the lower cam but it disappeared as I watched so I wonder if it was a spuot of water. Too hard to see at that distance and the middle close up cam is just constantly trying to connect.
Really sorry bit I don’t know how to take a screen shot. Kids haven’t taught me that.

20. Una Canaria says:

Oh, oh! Bubbles again…

• Una Canaria says:

Come on, Bob! We want to see some of your pyroclastics. Nah…bubbles have disappeared again.

• Newby says:

Soooo frustrating isn’t it. I saw it really bbbling also earlier today but as I don’t know how to take a screenshot it is a shame not to be able to save it for others. I really must try to learn. I think someone mentioned on an earlier thread how to do it. I think I must try to find it and practice the method.

• Una Canaria says:

I do not know either. But you’re right, it’s the only way to catch those bubbles that appear and disappear all the time.

• Do you have Windows?

• Una Canaria says:

Do you know how it make it?

• ukviggen says:

If you’re on a Mac it’s:

Shift+comd, 3 (the proper key, not on the number pad)

• Una Canaria says:

I have Windows.

• Newby says:

I am on a windows laptop and running Firefox.

• I only know the windows world – and yes I can make screenshots

• Newby says:

Sissel, any info of how you do it would be greatly appreciated.

• If you have Windows you also have the (ancient but good) program “paint”. Ever used it?

21. Newby says:

Sorry no and as I have google chrome I can’t find it. I will ask my son when I see him though.

22. Una Canaria says:

I think I know. I found it on Google.I will try to do it when the bubbles get out.

• Newby says:

Hi Una Canaria, thanks for the link, my son has just come in and says a bit later he will show me how to do it and write it down for me. I am not very good at following written instructions and find it much easier when shown how to do it. I blame being older but I mustn’t let my brain seize up for lack of use. I need a lot of practice though so hope for lots more action on the cams.

• Una Canaria says:

When someone wants to learn, no matter the age. And do not say you’re old, because maybe I’m older than you! 😥

• Newby says:

I think not! Nobody on here is older. I don’t think they will admit they are anyway. I am 62

• Shhhhhhhh Newby. Don’t tell anyone but I was 67 on Sunday 🙂 I hope that makes you feel very much younger 🙂

• Ursula says:

@ Diana: ha, another Sagittarius. 🙂 Happy belated birthday!!!

• Good guy, your son! Remember, it is very easy – you will laugh when you know.
As a preparation, search for the Prt Sc button on your keyboard!

• ovejamecanica says:

Una,
Presione ‘imp pant’. es la clave de 4 º de la parte superior derecha del teclado.
entonces se puede pegar a una página en blanco de Word de Microsoft, si no tiene una programa del ‘paint’

• Una Canaria says:

Gracias, ovejamecánica! Da gusto tener asesores de informática en un blog de volcanes.

• Una Canaria says:

Lo hice! Gracias. 😉

• Edward Lane says:

translation (ish)

press on ‘Print Screen’ it’s a button probably at the top right of your keyboard

you can then paste that screenshot into a blank word document if you don’t have the ‘paint’ program

the paint program lets you save it as a few different file formats – it you want the biggest file with the most info save it as whatever file name you pick.bmp, but thats usually not the best choice i’d suggest you pick filename.PNG as that stores the data more efficiently without trashing the image (which jpg sometimes does)

incidentally if you’re more PC literate and want a decent free equivalent to photoshop I’d suggest getting paint.net as that seems to do prettymuch everything photoshop/illustrator does and it’s free

• But Photoshop is a little (ehemm) more complicated than Paint, so if you want to start easy and free Paint is a good base.

• Sorry Edward, read too fast – thought you recommended Photoshop!!

• Una Canaria says:

Thanks for the explanation! I’ve done with the Paint and the image has been perfect. Now I have two ways to capture screens.

23. GeoLurking says:

Ref carbon fibre ship building.

Not a new technology. Carbon fibre is one of the strongest yet flexible construction materials known to man.

Wr used to call it “wood”.

• eyeofskye says:

Charred wood. Basically you build a wooden ship, set it alight, wait a bit and put it out. Now you have a carbon clad boat.

• Is this how it is being done?

• Una Canaria says:

😆 Very funny, Sissel!

• Carl le Strange says:

Yeah, and used to use tar and sap as binder too… Oldest composite boat I know of is from 1492 in Venice.

24. ok, first person to see a mermaid on the webcam wins a sheep.
Scratch that.
First person to see a sheep on the webcam wins a mermaid..
that’s not right either, dang it..

• kenpea says:

First one to see a mersheep wins a volcano?

• that might just be realistic… there were plenty of black ones out there the other day.

• Edward Lane says:

I see a dalek sheep – can I have my dalek mermaid delivered please

• Edward Lane says:

or can I look on any old webcam ?

• Edward Lane says:

you made the restrictions a little wooly round the edges – can you blame me ?

• kenpea says:

Merdaleks! lol

• Edward Lane says:

Wow their beauty is a wonder to behold

• GeoLoco says:

First to see a sheep on a mermaid gets a webcam to share this natural wonder.
Imagine the result, a hairy baby that smells like fish…
Mermaids: Half tuna, half chick. Kind of its own, definitively strange.

• Edward Lane says:

it’s a tad pricey – so it had better do what it says on the tin

• Carl le Strange says:

Ursula… Even I think that 3500£ is a bit steep for a piece of software 😉
Could you register us as a University so we get that Free Teaching Software price?

• Ursula says:

I know it’s pricey. 😦
I just said this could probably what my voxler can’t…
And unfortunately my university is not on the list (and we don’t actually have geology dept here, so no dice, sorry).

25. Edward, you have definitely been watching the webcam too long!

• GeoLoco says:

Bruce, you recently told me you think we live geologically close to each other. So where are you?

• sorry, yes, I didn’t get back to you. To the west of Stuttgart, about an hour and half from the Swiss border. It sounds like you live near Bregenz ?

• GeoLoco says:

No, you could say near Bern.

• GeoLoco says:

Actually live in the Prealps.

• ah! the Jura! extends right through to our neck of the woods too. Nice! Still, not too far away. If you blow your Alphorn I might just hear it.

• GeoLoco says:

I’m not elastic enough to blow my alphorn by myself…

Nono, not the Jura. The Prealps. Geologically another beast. But I work in the Jura-area (quite a bit from home), tectonically speaking. Switzerland is small, you’re fast from one point to another. Stuttgart really isn’t far.

26. I see a lot of thirsty people in here, remember that the Bar is open 🙄

• Carl le Strange says:

Spoilsport… Go and write a new blog post instead. Bad mountain troll 😉

• inannamoon says:

If you write it, they will come 🙂

• Newby says:

Wot maks U fink we R firsty?

• Newby says:

Arrrr OT p’raps?

• Newby says:

😳 jus’ practisin.

• Edward Lane says:

is that something generating banging sounds to let people do more Lurking type plots ?

• Newby says:

OH!!!! That looks interesting! Wish I knew what it signified? Come on you clever people you are needed NOW.

• Edward Lane says:

Where are the clever people when you need them ?

ok well it appears to have started with a series of 12 bangs in 4 minutes, then been followed by 20+ bangs spaced out at regular 2 minute intervals

they seem too regular to be anything natural but perhaps it’s a particular size chamber that fills in 2 minutes and empties – a bit like a geyser ?

• Carl le Strange says:

Clever people? Where?

Buut seriously, Sissel nailed it down below.
“Drumbeats” are associated with increasing pressuge against plug in a volcano. Now I wish we knew where that plug is… It is a sign of an eruption coming closer.
Could one of our clever Plotters Plot a Plot of the Plug?

• Ursula says:

Re: plotting: this started at about 16:20.
Since then, IGN Hierro boletin lists three (only) earthquakes:
1) 2011/11/29 16:19:23.24 27.6160 -18.0755 3.70 2.70 28 2.10 3.3 1.60 0 8 8 0.40 283.0 1115502 SW EL PINAR.IHI
2) 2011/11/29 16:22:29.24 27.6536 -18.0758 4.60 3.10 8 3.80 3.3 1.40 0 8 8 0.29 255.0 1115503 SW EL PINAR.IHI
3) 2011/11/29 17:16:15.46 27.7655 -18.0631 37.30 6.90 164 21.70 7.1 2.20 0 5 5 0.18 209.0 1115509 W FRONTERA.IHI

So, nothing much to plot…
Although since 1&2 are close apart, this is probably Bob (see location):

• Ursula, if that’s the plug, it’s a pretty deep one: 15 to 22 km.

• Ursula says:

Bruce, it may not be the plug – it is just only three earthquake points published until now (so the only thing I can plot)…

• Ursula says:

Actually, Bruce, the first two depths are much shallower, they are 2.10 and 3.80 km!

• Newby says:

Thanks to Sissel and you Carl I have learnt something else new today and when I can drag my son from computer games I will know how to publish a screen grab. Two things in one day! Overwhelming. 😉

• Here is som information on “drumbeats” in Mount St. Helens: http://news.nationalgeographic.com/news/2006/11/061122-volcanoes.html

“The current eruption of Washington State’s Mount St. Helens, which began about two years ago, has been marked by a series of weak, shallow earthquakes, or “drumbeats,” that occur every couple of minutes, a new study says.

The “slip/stick” motion of the rocky “plug” being pushed out of the volcano is causing those rhythmic quakes, according to scientists from the Cascades Volcano Observatory in Vancouver, Washington (Washington State map).”

• Newby says:

Many thanks for that Sissel, I wonder if this indicates a newer eruption area is about to happen.

• Lurking, please tell us, where is the plug?

• Ursula says:

See my comment above (at 19:09):

• Three locations? Would expect just one!
I also wonder if the drumbeats are strong enough to have been listed anywhere. There have been tenths of them in short time.

• verrry interesting… let’s see what happens next. Either it’s the dying putt putt putt of the active vent or, much more likely, something else is afoot.

• Woomf says:

Bob’s still drumming… and there are stronger bursts around 20 to 30 minutes apartt

• Una Canaria says:

It could be for this reason:to make a study of the earth’s crust, ship Sarmiento de Gamboa has to launch seismic waves that are reflected in the seismographs. Is this not the way to make a “scan” the crust of the Hierro?

• Edward Lane says:

that was my suggestion at 18.35 🙂

• Una Canaria says:

Ah….

• doh.. that’d be it. wish I’d understood you the first time! Well thought.

• kenpea says:

I got this record of the track that the Sarmiento de Gamboa took today.

Thanks to Sissel.

27. Alan C says:

@ Geolurking
A stonkingly good blog, sorry I;m a bit late reading here, however…!!

Anyone fancy a ‘health and safety’ moment?

Aaaaaarrrrggggghhhh!

• Newby says:

And not a safety rope to be seen. Argh, I fell out of bed the other night and nearly lost my nerve to ‘get back up there again’. 😉 This has made me scared to sleep now.

• Alan C says:

Well at least he’s wearin’ an ole ‘ard ‘at!!
Risk assessment – wos that!! – may drop lunch!!

• Newby says:

The French used to shout “Guardez l’eau” when emptying water into the street. The English used a corruption of it, Guardy Loo, when they emptied their chamber pots into the street. Wonder what these blokes shout when they need a toilet break. 😳

• Newby says:

I hasten to add this was many, many years ago in London. hahaha

28. eyeofskye says:

Mersheep

• Alan C says:

No Lambphrey

• Una Canaria says:

I’m going to have a coffee, I’m seeing terrifying visions 80

• Ursula says:

Sorry, but that is scary… If I was snorkling and saw something like this, I’d drown.
😉

• Newby says:

Hahahaha. thanks for the laugh!

• Alan C says:

OK
Wash woollens in cold water……..

• eyeofskye says:

Nobody said they were nice.

• Alan C says:

Sorry didnt work
Was a sheep crossing a river

• Newby says:

Do sheep swim? Yes, they also drown. I stayed in a small cottage on Mull one year, many years ago. On the 7th day I went for a walk up the hill and discovered where our water came from. A small loch complete with a drowned and bloated sheep carcase floating in it. Brother felt sick, I just thought it funny and boiled the water after that. Well I had boiled it anyway but hadn’t bothered when brushing my teeth! I did after that!

• No fear! The Mersheep would save you by bringing you back on land and give you a big cup of hot chocolate.

• Una Canaria says:

Sissel, you’re always so positive! 🙂

29. Alan C says:

Melhnausar – just a little action

• Newby says:

Where is it Alan?

• Alan C says:

South of Krafla, North of the Hreid… that I can’t spell!!

• Alan C says:

Herdubreid

30. just an outlandish idea. but if the two nests of seismic activity indicate two distinct locations of melt that hasn’t yet interconnected, then perhaps this drumming is a sign of them interconnecting… resonance patterns getting set up or something, at least this would tie in with the location of the last quake.

• forget this, Edward’s got a much more plausible explanation above.

• Newby says:

Yes, but is the ship still around and why the change in time frequency?

• Edward Lane says:

is the ship in motion – is the aircannon irregular in it’s function, are some of the quakes real ones mixing the signal or is this really volcanic – I think it needs a plot showing where they are centred and then someone to dig out that ship movement link – and see if they tally up.

• Newby says:

No they are still there although fainter. I am afraid I don’t buy the ships sending out seismic waves theory unless someone can show me the ship is still in the area. I would still go for natural tremor rythme. But then I am just an old granny. 😉 I do still have an inquiring , if sceptic, mind though.

• Edward Lane says:

or perhaps it’s easier ? for someone to ask the ship if they are making rythmic pulses that are picked up on the seismographs

• Edward Lane says:

@Newby – Plaudits for the sceptical attitude 🙂

currently I’m leaning away from the aircannon toward actual volcanic – as I think I can see it detected on other stations – and I’m guessing the ship would not be capable of generating such powerful bangs.

but I’m not a volcanologist and I don’t know diddly squat about it 🙂

• kenpea says:

Ship is still in the area, and seems to be sailing a “box” …….

31. kenpea says:

Looks like a volcano sized version of “water hammer” that you get when there is air trapped in your water system at home.
Gas in the system?

I know more about home water systems than volcanos….. 😉

• Carl le Strange says:

Actually, that is one of the 2 things that is most likely to cause it. See my post 😉

• kenpea says:

On my way!

32. Carl le Strange says:

New post up about the Drumbeats!