Sunday Summary and a RIDDLE!
Impressive eruption!

Etna had paroxysm # 12 for this year on Saturday and  Dr. Boris Behncke announced it in advance and provided an image and explanations as always. I especially like his vivid decriptions of the situation.

IngeB: “Loud bangs were still to be heard yesterday evening and ash fall continued in some regions (

Lava columns reached 800 m today ( ). Volcanic material (lapilli, I suppose, hope not bombs) rained down on western side of the volcano.”
Black rain from the ash cloud and the distant roar of Etna:

Some points from an interview with D. Patanè (INGV):
– very important eruption, about 20-30% more energetic than the last ones
– eruption column up to 10.000 m height
– very fast intensification of eruption
– lava flows til down to bottom of Valle del Bove (I think that is what is still ongoing and seen on the webcams eg. )
– second paroxysm within 48 hours.

On this footage you can watch the shower of lappili falling over Etna’s surrounding cities:

THANKs to IngeB, KarenZ, Renato Rio, Alison and Chryphia for their comments links and images.
Unfortunately we have to report another deadly quake happened the province of Sichuan. Today they say 1,5million people were affected, 168 dead people have been found so far and 11000 were injured.

6.9 51km WSW of Linqiong, China 2013-04-20 00:02:48 30.314°N 102.934°E 16.4

Tectonic summary:

IngeB: “If reports are correct, there have been landslides and considerable damage on houses:

Interesting article on spreading of earthquake waves around the globe and acivation resp. stress relief in other regions:

I never like it when i have to report of such desasterous events. *sigh*


Islander provided a map i had not seen before.

And Schteve took a few screenshots of Stromboli which has been more active then normally too, lately.

Kilauea shawed vigurous lava spattering from the north spatter cone within Pu`u `O`o crater :
Graniyas Webcampage to watch for yourself. 

And last but not least:
I had my normal link problems during weekends and sent Chryphia the wrong ( old ) last weeks riddle by AlanC.. So you get a riddle on a Sunday for a change!

It’s sad, but because he can’t wear me, poor old Uisdean has to stand by the table naked!
What is my name?
What am I and of what am I made?

5o9ppvCorrection: Islander found out Hekla is either a zebra and Newby sees similarities to a  sperm whale.


198 thoughts on “Sunday Summary and a RIDDLE!

  1. Thank you, Spica, for the nice summary again. 🙂

    For these interested in the strange behaviour Stromboli has been showing lately, in my opinion, this ressembles – partially anyway – , events which took place at this volcano in 2002-2003 and which culminated in a landslide down Sciara del Fuoca as well as a paroxysmal episode (for more information see: S. Calvari, etal.: Chronology and complex volcanic processes during the 2002–2003 flank eruption at Stromboli volcano (Italy) reconstructed from direct observations and surveys with a handheld thermal camera (2005) ).

    We are now more lucky, and don’t have to hold the thermo cams! 😉

    But lets hope that Stromboli doesn’t get too inspired, this last time ended with the destruction of houses in a nearby village and some people injured .

  2. For the :evil” riddle: Diamond, made of carbon.

    Twisted logic:

    From Wiki: “Ùisdean,[1] sometimes also spelt Uisdean,[2] is a Scottish Gaelic masculine given name. It is a borrowing of the Old Norse personal name Eysteinn, which is composed of the elements ey, ei, meaning “always”, “forever”; and the element steinn, meaning “stone”. ”

    And “Diamonds are Forever”

  3. or maybe the answer is the Quiraing itself, a landslide. Another possibility is the Prison, a rock formation in the same area.

  4. For Alan’s 👿 riddle you could try opal

    The Scottish Gaelic name has been Anglicised as Hugh (note that Hugh is also used as an Anglicised form of the unrelated Scottish Gaelic name Aodh). Aodh (pron.: /ˈeɪ/), or Áed, is an Irish word of Indo-European origin, equivalent to fire in English. There is a variety of opal referred to as fire opal. Fire opal is hyacinth-red to honey-yellow and shows intense orange and red fire-like reflections. It is the only variety that can be faceted, as some specimens are totally transparent

  5. @Spica and other Lovely Dragons. Please note name confusion manifesting itself in this weekends summary, again.

    All persons living here and that are “Icelandic citizen” are Icelander(s). True.
    These can be the same, and in my case! 🙂
    “islander” is any person living on a island, also island named Iceland, but this “islander” occationally commenting in VolcanoCafé, but rarely gets any enough attention at all… *he under stands… sigh .. not all can be funny all the time … and PLOT too*
    An person living on the island of Iceland, in northern part of the North-Atlantic (not the local Ice-Creme store in Rural or Central or Urban or Town, USA, or the local food store in UK, that actually thinks it was Icelandic once, but probably isnt).
    Learned again today. Island is Iceland in German.
    So “islander” gets translated to Icelander, but not so.
    Note: I do not say the “United Kingdom of Great Britain” – UKoGB – but who´d undertstand that?* – But that is correct name of Northern-Ireland, Scotland, England and Wales.
    Perhaps North-London Zoo too, but I think these are not UK´ers, they speak so different?
    And Hekla is Zebra (not Zerba). I do not think Hekla is a Sperm-Whale. Maybe a Tiger?

    That was my *non-riddle*, and Silver-Herring!

      • Ok, sorry, no harm meant.
        Probably unfamiliar to them living in The Eastern Atlantic (TEA),
        but I think better than uKGB (think iPAD, iTUNES, etc.)
        Now I have offended every Brit on whole earth 🙂
        *puff, vanishing act*

            • Rofl…….. You Icelanders have a very dry humour. I have a problem though…..are you actually an Islander or Icelander or an Islander from an Island off Iceland which would make you an islander islander ………I need coffee #2 😀

            • nah, mostly an mainland Icelandic islander – but very important part (father side) of my genes come from the Laki areas. So very deep down in my mind I have seen Laki fires
              (I think really long term memory works that way, often confused for telepathic)
              *Thats probably why I am drawn towards eruptions but absulutely refurse climb dormant volcanoes, from fear they will erupt, whilst climbing!*

    • Sorry islander. Corrections done, but i am not sure i covered all correctly, but i do not have more time right now to fix more. I appologize.

    • Just to confuse / explain even more:
      The United Kingdom is a political state consisting of the separate countries of England, Scotland, Wales and Northern Ireland (and the Isle of Man and Channel Islands).
      Great Britain is the largest island in the British Isles Group. The states/countries of England, Wales and Scotland are on this island.
      The British Isles are all the islands off the coast of France that make up a geographical group: Great Britain, Ireland, Isle of Man, Channel Islands, Orkney Isles, Shetland Isles, Inner and Outer Hebrides etc. etc. etc.
      The Republic of Ireland is on the island of Ireland along with Northern Ireland.
      Don’t call someone English if they come from Wales, Scotland or Ireland.
      Don’t talk about England when you mean Britain (i.e. the island of Great Britain).
      Don’t call someone from Ireland “British” (even though geographically they are from the British Isles).
      Politics often gets in the way of geography! 🙂

      • Stand corrected. When did you have last a war between Englandand Scotland/Wales?
        When was it united? My opinion is Scotland should be free!
        Much more complicated than beeing islander from island named Iceland, but not from an island beside another island that is called Iceland.
        *so answers Diana too.*
        I have been an temporarily an islander on an island beside another island called Iceland, but that island should be called Niceland! (but was Unplesant Island in days of eruption in 1973)

        • Wales was conquered by Edward I in 1282 and joined to England in 1284. This was made legal in 1536. Wales is a Principality rather than a Kingdom (this is getting complicated). It now has it’s own Assembly (Parliament).
          King James VI of Scotland (also known as King James I of England) became king of England, Ireland, Scotland and Wales in 1603 when Elizabeth I died, but Scotland was still a separate country legally until the Act of Union in 1707.
          The last battle between the two countries (apart from some skirmishes) was Culloden on 16 April 1746 when Bonnie Prince Charlie and his Highland army were defeated by Butcher Cumberland (the English General).
          Scotland now has it’s own Assembly.
          Northern Ireland has had an Assembly since it stayed in the United Kingdom when the rest of Ireland became independent.
          There is also a Parliament in London that has representatives from all four countries.
          England does not have a separate Assembly.
          It is complicated isn’t it? 😀

          • Thanks, much clearer. Excuse my poor English historic knowledge, it does not interest me tiny bit beyond anything 1914ish (WW1).
            Here we had several hundred small Kings (farmers) and then a Nordic King (mostly Danish-isch) for several hundred years, then took 64 years to self destruct (1944 – 2008 = 64 years).
            Yes I say self destruct! We ourselves messed up, them eruptions came in 2010 (even after last Harmageddon government, led from 2009 by a lesb… err… flight attendant!) Does not make sense have fight attandants up front does it?

      • Just to clear some things up, here is a youtube video making this all very easy to remember 😀

        Ok not really, but that is because it is mighty complicated!

        • Hmm! I think he goes a bit astray when he gets on to the Commonwealth. Lots of countries belong to the Commonwealth that do not recognise the Queen as Head of State. Also the Crown is run by Parliament not the Queen.

        • That’s funny! And more or less correct!
          Doesn’t explain why the state of Hawaii has the Union Jack in the left-hand corner of its flag though!! 🙂

          • Fair point about the Commonwealth. A bit of a strange grouping really – a couple of countries that were not former UK colonies have since joined, while there are a lot of former UK colonies that are not a part of it.

        • Newby – Yes, the Romans were there and then the Jutes arrived! Is it part of Hampshire now or a county on its own? There are so many little islands, like Steepholm and Flatholm that were owned by Vikings and all sorts, it really is very complicated!

          • Yes Talla the I.O.W is a county in it’s own right. Some say the smallest county however the dubious privilege is shared with Rutland depending on the state of the tide. Confused? No wonder. Here is Wiki’s explanation.
            The Isle of Wight is a county and the largest island of England, located in the English Channel, on average about 3–5 miles (5-7 km) off the coast of Hampshire, separated from Great Britain (referred to by its inhabitants as “the mainland”) by a strait called the Solent. It has the distinction of being England’s smallest county – but for only half of the time. It has been calculated that during high tide Wight’s area is slightly less than that of Rutland, but not during low tide.

    • Or Orkney 😕 – made of old red sandstone, with some Middle Devonian basaltic volcanic rocks on western Hoy, on Deerness in eastern Mainland and on Shapinsay. Lamprophyre dykes of Late Permian age are found throughout. Also some chalk, flint, boulder clay and moraines.

  6. Semantics…. It will always get you in trouble.

    Here is a Helo.

    No reason. Just a picture my wife found in a box. She asked me what it was.

    Any takers?

    It is getting a splash of fuel – HIFR – “Helo In Flight Refueling” I had the unnerving experience of being hoisted up by one of these to transfer to an H-46 to get back to San Diego so I could go home on emergency leave when my wife’s dad passed away. Damn near died from the return drive to San Diego due to some odd virus that I picked up.

    … first to nobody and third in a class all by ourself. (can’t get much more demotivational than that, though I found it damn funny when someone put a light sheen of metal polish on the deck outside the JO’s bunk room. At least two of them slid into the cable ways outside their state room. In reality I thought it was a great little ship while I was there. I didn’t at the time… but that’s part of life.)

    • OT, cause there is not much Volcanic about these…
      And that is H-3 “Sea King”, not H-46 “Sea Knight”
      very different helos (I know, you did not say that)
      but thats like knowing which is Boeing-Vertol and which is Sikorsky…
      tailcode says which unit/base, and on this on side perhaps “HS-6”, tailcode “NT”,
      but I do not see them clear – onboard ship code “34” (MODEX NS-34)
      the reason for 34 be, third onboard that ship/base squadron, Helo 4 within that unit.
      However, usually now there are three digit numbers in use (Last three of the Bu.Aer. number), so photo slightly dated (taken 25+ years ago?)

      • Photo was some time between 1982 and 1984. And yes, it is an H-3. This ship was only certified for H-2 SeaSprites. One other time, saw our XO leaping up and down, waving at the helo (you can see him in the pic) when an H-46 sat a rear wheel down on the deck for stability (H-46’s have a massive wind field). The XO was fearful that the pilot was actually going to do a full set down… something our deck could not handle.

        All the H-46 pilot was trying to do was to give aircrewman a better toss for the mail-bag, and allow him to more easily retrieve the outbound bag.

        One task that is pretty wild for the deck crew, is to ground the cable before attaching anything to it. Lots-o-static electricity from the rotors.

        • Thanks, Historically speaking, the period fits the colur scheme, before all were painted Grey, Gray or Grey! Static. True. Even my car kicks off static, quite often on stepping out, especially in dry, windy, sunny conditions.

  7. Here is how Icelandic Volcanic Web Cameras excell (German funded, no cash, only ash left) Condition: Night. Weather: Storm. Form of precipitation: Rain. No one probably says: Thats nothing, eruptions always show the glow!
    But now a true story. Three news guys running round an old cold lava field during the Krafla fires in 1980´s, they were looking for an eruption, at night, using a flashlight!

  8. “MAN” strikes again!

    My wife didn’t feel like cooking, and asked if I had any more of the smoked sausage links left. (for grilling). I got saddled with grill duties, (my place in life, right next to the dog bowl)

    Looking for something to go along with it, I grabbed a whole white onion, skinned and quartered it, then stuffed it into a bell pepper with a lump of butter, wrapped it in foil and tossed it on the grill. It came out very nice. I did one with garlic and cayenne, the other with-out. Both were great!

    Hit me with last minute changes of plans? …sorry, I am descended from homo habilis and homo sapiens. I will find a way out of a pickle… or destroy something in the process.

  9. Uisdean is a good Gaelic name…

    Couple of mountains on Skye names Macleod’s Tables

    And of course a major igneous centre…

    Wonder if that’s headed in the right direction…

    • Dunno, but found a legend for Macleod’s Tables:

      “The flat summits were created after the visit of Saint Columba to the island. He was not well received by the Chief, who at this time lived in a Dun on the shores of Loch Bracadale, and was refused any hospitality.

      St. Columba was invited to preach a sermon in the local church and chose as his theme: “The rabbits have their warrens, the birds have their nests but the messenger of the Lord has nowhere to lay his head”.

      During the sermon, the skies blackened and the ground shook, culminating in an almighty crash. On leaving the church, the congregation discovered that the tops of the two local mountains had been struck off, creating a bed for St. Columba to sleep on and a table for him to dine at.”


      Macleod’s Tables are part of the Skye Lava Group – Igneous Bedrock formed approximately 55 to 65 million years ago in the Palaeogene Period. Local environment previously dominated by eruptions of silica-poor magma.

      Healabhal Mhor – Hawaiite And Mugearite.
      Healabhal Bheag – Hawaiite.

    • Don’t forget Table Mountain in South Africa. I didn’t have time to do much on the Riddle last night but I went down the Periodic Table route. There are two groups that are outside the table – one of them the “Rare Earth” group. I thought it might be one of them but I don’t have time to research as I’m supposed to be working! 😀

    • Oh My Newby! Has Irpsit been up kicking the equipment to see if it would wake up Miss Hekla? All plots showing a dive downwards . I put my money on a gremlin in the works if it wasn’t Irpsit. I shall watch with interest…. Thanks for the heads up on this.

      • I have this funny feeling in my bones, another few days then Hekla goes. But as it is now well known that my ‘funny feelings’ rarely come to anything then no worries there then.
        😉 🙂 😀

        • As Carl is hopefully to be ‘back soon’ then now is the time for her to go and before the snow go and people like Irpsit want to climb it. LOL. 😉 No offence meant there Irpsit.

          • I’m sure Carl is waiting for Hekla – I doubt Hekla will wait for Carl! 😀 The Great Dragon Lady certainly seems to be lively today! 😀

  10. No time to dally solving riddles yet..I have work to do. packing a mound of stuff I sold on ebay and then off to the Post Office and walk the long Mile………The queue there snakes around the convoluted barrier system that stops those in the queue who are about to loose the will to live, breaking out and committing awful deeds of violence with their parcels, pension cards and driving documents. This is the real reason why the padded envelope was invented. 😀

    • Oh Diana, I get so very frustrated at the post office now. They shut most of the smaller sub Post offices in my town and now the queues at the Main post office are horrendous. I waited for 40 minutes last week!!!! Earlier I had seen the queue out of the door and decided to go back later. Well guess what? Yes an hour later the queue was worse!!!
      Problem is they often only have two counters open out of seven and one of those is a Bureau de Change and has a separate queue with priority for money change (and we now have so many EU nationals in the town that there is rarely not someone waiting!) and the other counter is also a fast drop counter for Internet post and priority is given to anyone using that service so the result is no dedicated counter for the rest of us mugs who just want to conduct normal post office business and must have the frustration of seeing others come in and jump the queue. GRRR! Oops, haven’t taken my blood pressure medication yet. Thanks for reminding me. 😉

      • When I moved into the little town I live in 15 years ago we had a main Post Office and at least three sub Post Offices. Each of the surrounding villages had a sub Post Office as well. Now we only have the main Post Office which has to deal with all the work of the sub Post Offices plus the extra work caused by the explosion in online buying and selling (I’m an eBayer too Diana!). Always a long, long queue with grumpy customers and stressed Post Office workers. 😦

    • I’ve never seen it quite as bad as this – even during winter storms. I think it’s getting closer and closer to doing something – may be two days? (Just wild speculation here – I know nothing).

        • Chryphia, I think that is noise. Everything seems normal for me. But I was more interested today in Katla region. There were two M2 earthquakes, one at Katla, another at Torfajokull, but low quality. I wonder where they exactly occurred.

          • Sunday
            21.04.2013 18:07:28 63.728 -19.246 41.6 km 0.5 42.72 9.8 km N of Goðabunga

            And this one is surely wrong. Maybe it was a deep quake, but 41km is already below the crust in that spot of Iceland.

      • Maybe rescaling happened. The pic for 9:00ish looks different now. Maybe running water and melting snow is near the stations. Also windy weather would add to it. Pressure drop could explain the strain drop. If this keeps up after the weather is better, then maybe.. 😉

        • Have waited commenting on this tremour readings today, untill it settles down – it appeared begin with the storm last night, but has mostly failed return to normal, as storm seems have passed over, despite some rain/snow falling still. I do not why this is. Perhaps the daily “work in progress” near HAU interferes – I think this should be investigated what causes this – but possibly then distant shores pounding (from waves) is teleported inland, perhaps there is some wind at Hekla tops (that transmits down), anyways there is “noise” on the strainmeters, this is mostly from wing/storm waves on distant shores, I think, and maybe snow (glacier) is compressing on Hekla (it may have picked up a quite few tonnes last niight, perhaps millions of tons of snow, that need be “evened out” as strain into the foundation or surrounding terrain). But I think there are real reasons to watch Hekla properly. Just hope it will not be twins!

  11. I think Nevado del Ruiz has done something decisive. There was a rather big steam cloud about 30 min. ago, and now all is grey-black in front of the webcam.

    Someone mentioned some days ago, that tremor was rather high there.

    Hopefully people stay safe..

    • Following INGEOMINAS report, since one week from now, there have been quakes up to magn. 4 at the volcano connected to rock fracturing within the edifice at a depth between 5 and 9 km. Tremor was of different amplitudes and intensities. Gas and ash plumes up to 800 m were observed. So perhaps it#s again just minor activity happening. Deformation is ongoing.

    • Skye Dolostone or dolomite for riddle.
      Dolostone or dolomite rock is a sedimentary carbonate rock that contains a high percentage of the mineral dolomite.

    • If he lives on the Isle of Skye there is no way he could stand naked, he would definitely be wrapped in something made of very fine mesh from head to toe, otherwise the zillions of midgets there would eat him up to the bare bones! At least in summer. 😉

      • And what am I made of? The stoff that slipped was basalt, which was deposited 60 my ago on lose sediments, causing later the biggest (prehistoric) landslide in the British Isles.

      • There’s a Caisteal Uisdean (Hugh’s Castle) at map reference NG 3804 5825 north of Portree on the east shore of Loch Snizort (Skye). This was built by Uisdean MacGhilleasbuig Chlerich who was a rebel and pirate who ended up dying of thirst induced madness in Duntulm Castle dungeon! I’d can’t find any record of him standing naked by a table though!

            • Which can be quite hot but otherwise have nothing volcanic about them as far as I know… 😉

            • Located 1.5 miles to the south of Staffin, on the east coast of Skye’s Trotternish Peninsula, Kilt Rock is a 200 foot high sea cliff. The striking rock formation, composed of massive columns of dolerite, has bean compared to the appearance of pleats in a tartan kilt. Kilt Rock is a popular viewpoint; looking to the west, the visitor can also enjoy views across the Sound of the Isle of Rona and of Wester Ross.

            • Which I think is Mafic magma on top. I can see how it is called Kilt formation though, it looks just like the folding of a kilt.

            • Um, where did I get that Mafic magma from????
              Too tired for this. I had severe insomnia last night and only got two hours of sleep. Suffering now so of for some sleep.

            • Of course Staffin is in Skye, was having a blonde moment there! Also I only copied and pasted the description of the rock…so bean instead of been was not my spelling error.

            • Yowee!
              Now you know why Uisdean couldn’t wear me!!
              Kilt Rock ‘t is on Trotternish – hence the clues ; the Table and Uisdean for the locality!!
              What’s it made of and what is it?

            • The Kilt Rock is so named as it has the appearance of a kilt. It is formed of vertical black basalt columns (the folds) with intruded sills of dolerite (forming the tartan pattern).

            • It is formed of vertical black basalt columns (the folds) with intruded sills of dolerite (forming the tartan pattern).

            • As for insomnia. How is it possible to not be able to sleep when only sleeping for 2 hours the night before? Baffling!

            • Hey Newby, we can call it a dead heat. Besides, knowing Fred we might not have got the exact answer he’s looking for, that wouldn’t surprise me.

            • Nothing about the ‘evil one’ known as Fred would surprise me Kelda. But he really does do some superb riddles doesn’t he and i am learning so much. Now I want to go to Skye to see it! One day, when my inheritance arrives. LOL
              Also you already had the Kilt rock formation mentioned much earlier to Kudos to you Kelda. IF Fred says it is all Hunky Dory.

            • Hey Newby, I hope you get to visit Skye one day, it is beautiful, but take a raincoat, wellies, preferably Red ones (colour optional, but Diana recommends them as the best) and lots of midge repellant. Regarding insomnia, try and stay up until your usual bed time. I get sleepless nights sometimes and find that trying to get an early night to recover only makes me obsess more about going to sleep, and it becomes a viscious circle. Failing that the Nytol tabs from chemist do the job very well, I only need half a tablet to make me drift off and feel fine in the morning. Hope you have a better night tonight.

            • Doh! That’s a major fail on my part! I’ve been to the Kilt Rock cliffs several times and taken pictures of the waterfalls and read the information panels – the whole works! I’ve even eaten vegetarian haggis nearby – my brain has really let me down. I’ll have to go and stand in the corner with a dunce’s hat on now! Congratulations to Kelda (and Newby)! 😀

          • In case anyone is interested – Uisdean, is a Scottish Gaelic masculine given name. It is a borrowing of the Old Norse personal name Eysteinn, which is composed of the elements ey, ei, meaning “always”, “forever”; and the element steinn, meaning “stone. The Scottish Gaelic name has been Anglicised as Hugh.

            • Kelda. Thanks for the good wishes for a better nights sleep for me. I did eventually get 6 hours. Feels good. 🙂

  12. On Hekla unrest:

    I spoke now with my friends regarding the hike they did yesterday. They experienced a scary moment!

    While the group (30 people) approaching the top, they all heard a large boom coming from underneath and they suddently freak out. The guides said it was just the snow collapsing somewhere. I was not there so I cannot comment on it. I know glaciers do have a lot of icequakes which cause a loud rumbling for 2 or 3 seconds, but sometimes there are also earthquakes (and magma movements causing loud sounds in active volcanoes).

    Whatever it was, it was a loud blast sound, and everyone heard (they were going in a line along the mountain, so the sound was heard across at least that side of the mountain.

    Take this as yet another possible (but not confirmed) sign of unrest to consider at Hekla. It could have been well a snow collapse movement, or something else like a release of gas or rocks moving due to pressure inside. Either way, the real magma pressure is not near the surface, but around 10km deep. However Hekla has been hypothesized to have several magma chambers, one of which is just underneath the mountain, very shallow. Any movement there could trigger a local loud sound, if you happen to be passing at that moment.

    They all had a nice but very hard hike, due to lots of fresh snow, other than this small incident.

    At the top, they all saw the steaming coming from the fissures of past eruptions, which goes several meters in the air, and melts the snow at the top. But the steam levels were not unsually high or low, they were comparable to previous years. The ground there is always hot to touch.

    • This is not to alarm anyone. It could have been the loud noise from a snow collapse, due to a lot of fresh snow on Hekla.

      And even if this was a local sound due to rock collapse, release of gas, a small underground phreatic explosion, or even at the remote change of it being a small magma movement, it would all indicate shallow activity, which per se does not sign to any imminent eruption. But some of these explanations would link to an increase in pressure, which is already well known by past earthquakes and GPS readings.

      • Wow! Thanks for that Irpsit. I’m glad it wasn’t me – I don’t like climbing and I don’t like snow and I’m sure I wouldn’t like to hear a dragon waking up underneath me. 😀

      • Probably the Glacier on Hekla rumbling (it may slide and rumble under load of new fresh snow, glaciers often rumble). I have heard Eyjo rumble, I once hilked up the falling glacier – but also rockfall creates distant rumbling, that can be heard several kilometers. So Hekla rumbled? Perhaps it was her, perhaps not. Even small meteors create rumbling in the atmosphere.

        • exactly. some weeks ago I heard similar as a military-jet break the sound barrier (airbourne wave often heard in the “old F-15 at Keflavík” days), but no such were possible due absense of any local based fighters! So likely a meteor, or a high-altitude Lightning, but as it was light but cloudy, no streaks were seen.

        • Well Hekla has no glacier. A glacier is technically snow that has accumulated every year and is pressed into ice, and therefore remains year after year, and then slides downwards.

          Hekla has only snow. In the summer, all the snow in Hekla will melt away.

          So an icequake typical of a glacier (like Eyjafjallajokull), with its characteristic thunder noise, will not happen at Hekla. But snow might pile up and then collapse downwards and into cavities. That can create noise as it dislogdes rocks, but I think if an avalanche-like movement would have occurres yesterday, my friends would have seen it. Perhaps.

          I don’t know. Maybe it was just snow. Maybe it was just rocks. Or maybe it was some movement of rocks due to pressure. Or even a small underground phreatic explosion.

          I am more inclined to think that whatever happened there yesterday was cause by shallow heat causing either a rock movement or a phreatic explosion, inside the mountain.

        • yes, technically Hekla has no Glacier, only some summers the snow melts late, and I should not have written word Glacier, apologize for that, not thinking straight, when meaning “thick snow areas on north side”. This brings up question, why no glacier on Hekla despite 1400 meters high? Likely eruptions have melted what possibly acculated (not) in the cold middle ages.

    • If it sounded like thunder, it was probably a small avalanche, especially following fresh snow. But ice can make those noises without avalanches in non-volcanic areas.

  13. Believe me it freaks out these kind of stuff.

    Once I was hiking in Thorsmork, Godaland, which is right next to Eyjafjallajokull and Katla. And I heard a large rumbling which last several seconds and at same time the ground began to shake. It was a M3 earthquake and what place to scary you more, than just starring at Katla from a couple kms away. As it happened, I felt that heart stopping feeling and adrenaline rushing in, face redding, etc. Then, mind tries to say “its an earthquake”
    More impressive, I took note of the time and that quake came in map!

    • People I heard of were in the crater (rift) of Tarawera when an earthquake struck and lots of loose scoria clattered down. They got a hell of an andrenalin rush and scooted down the mountain as fast as their little legs could carry them.

    • Yeah… I remember being woken up in the middle of the night by a magnitude 5.2 earthquake in Lincolnshire 5 years ago, the epicentre was something like 100 miles away but the rumbling sound was loud enough to be even more fraky than the shaking. I think if I experienced something like that while I was climbing/hiking/anywhere remotely near an active volcano, I’d probably have a heart attack. NOT a nice experience, really.

  14. Dunno if this is the geology of the Kilt Rock Formation as I can’t find that on the BGS website so can’t add much more than has been said above. But I did find that it is probably part of the Little Minch Sill complex, The Little Minch Sill Complex has:

    Basalt, micro gabbro with hawaiite, mugerite and a bit of trachyte.
    Also olivine rich picrite, picro-dolerite, alkali dolerite and crinanite.
    Jurassic sediments.

    Found an interesting paper on this but I could not load it fully :frustration:

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