18 comments on ““A Plume has been Seen in the Distance…” – Mount Pagan, Northern Mariana Islands

  1. I thought I’m bringing this over over from the last post. Wonder what might become of it…
    This morning volcan Lascar in Chile had an ash explosion with a plume hight of 2500m. The seismic signal that accompanied the process had a small surface displacement of 1 cm2, a value considered moderate to low (or so I interpreted the Google translation) Special Report here: http://www.sernageomin.cl/reportesVolcanes/20151030100023908REAV_Antofagasta_30-10-2015_L%C3%A1scar%20.pdf

    (photo: Felipe Cadiz via twitter)


  2. Volcan Turrialba: A short video of an explosion on 26 Oct, showing a synchronisation of FLIR images and real colour video. In the thermal images one can see many smaller pieces of rocks being ejected which is not usually visible with the naked eye due to the thick ash cloud. Ejecta here are small, about one kilogramm, and are launched at high speeds and temperature. (published yesterday, by OVSICORI-UNA, on fb)


      • Turrialba again, very impressive! I mean… the communications/power technology… 😉 no offence meant to anyone, I know people have to put up with what they can get.


  3. Mt. Rinjani on Lombok (Indonesia) is still restless. An explosion yesterday caused a 600-m plume, and today it erupted again at 05:52 WITA with a (steam, ash?) column 1500 high over the Barujari cone:


  4. Wow, I didn’t know that people in earthquake prone areas have devices in their homes to alert them. They are mounted on a wall and give a sound when they record seismic waves… cool! You may want to turn down your volume in this video of the M 6+/- earthquake in Chile (Antofagasta region) some two hours ago:

    by Gustavo Montenegro via Twitter


  5. Looking on the list of explosions/eruptions of volcanoes in Japan, there is not a single volcano doing anything in that country at the moment. The last entry for Sakurajima was on 28 September, the last one for Suwanose-Jima on 30 September. October has continuous entries for Aso up to October 23, and then… nothing.

    Suwanose-Jima is always fluctuating with long lower activity periods in between, that doesn’t worry me. Aso, still on Alert Lvl. 3, may or may not be finishing this eruption, which started in Nov. 2014, yet there has been a 7-hour-period of increased tremor yesterday. What really does activate my *catastrophic view of the world* (thanks agimarc), picturing blocked ducts and changing eruption modes, is Sakurajima’s silence – not a single notable explosion in over 5 weeks, when did that happen for the last time?

    Although, checking on the latest weekly report, very small-scale eruptions in the Showa crater did occur on October 30 and November 2, so Sakurajima is not sleeping after all, and Alert Lvl. 3 ist still in place.
    Wonder what will happen next, will it just quietly resume its previous behaviour?


  6. To see what Rinjani is doing I have been looking for a viewer of the Japanese Himawari 8 satellite and found an exciting one on this website: http://satview.bom.gov.au/
    of the Australian Bureau of Meteorology (http://www.bom.gov.au/australia/satellite/). This viewer seems only to have the Australian part including Indonesia. You can zoom in to your area of interest, it has an image every 10 minutes and you can play a sequence of the last 4 hours. This is a short video capture I made with Streamcatcher:


  7. Howdy all – PhysOrg has an article modeling triggers for supervolcano eruptions. They point to magma chamber roof collapses or cracks as possible triggers, especially in pressurized chambers (which was not mentioned). The bad news is that the entire thing is based on computer models. Worse news is that it does not appear to bode well for roofs of restless calderas which flex up and down with the injection of new magma and its travel to newly formed dikes and sills. Rock is not particularly flexible unless it is hot, so the more it is moved, the more cracks and other lines of weakness are liable to form to be exploited by a pressurized magma body. Worth the read as yet another data point. Cheers –



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