28 comments on “Islas REVILLAGIGEDO (MX) – SAN BENEDICTO > VOLCÁN BÁRCENA

  1. Bogoslof is on RED again, eruption column to 31 10.5 km. Strange signal this time, not as pronounced as usual but rather a long buildup (MSW seismogram):

    Like

    • Actually, one can see the Bogoslof plume, on the FAA webcam “Dutch NDB” West in Dutch Harbor (left), and very probably on the Dutch Haystack NW as well (right), weather permitting, of course. In both images it would be on the left edge. FAA: http://avcams.faa.gov/sitelist.php


      Images cropped!

      Like

      • AVO: A satellite image from 13:26 AKST (22:26 UTC), just after this event, showed a dark ash cloud just northeast of Bogoslof. This cloud was darker in color, and presumably more ash-rich, than others we have seen in the eruptive sequence, which began in mid-December 2016. This image also suggests the presence of very hot material (lava) at the surface immediately surrounding the vent – the first such observation during this eruption sequence. (Wednesday, January 18, 2017, 6:25 PM AKST (Thursday, January 19, 2017, 03:25 UTC))

        Like

      • Bogoslof tends to blow holes first and build up land later in the eruption. The extension to the island may be mainly ejecta with a bit of inflation. The central hole will probably be filled in and replaced by a pushed-up cone at the end of the eruption. I was wondering at first whether the island would survive – seems it will do well enough. But the cabin that was more or less at the place of the eruption is gone! Perhaps it was already gone before the eruption – it was old.

        Like

  2. Hi Granyia

    the fan shaped lava flow is original

    Here is the translation.

    “Pumice has been seen “swimming” (more correctly floating, NdT) around these islands which are situated on the same parallel as Volcanoes Colima, Jorullo, Popocatepetl, and Orizaba”.

    Like

    • Thanks dfm! That’s funny, Humboldt, being a German, did not know to use a different word for ‘to swim’ – we don’t have one! To float and to swim is the same in German – schwimmen!
      So, those pumice evidence that there has been an eruption ~1811 from either Socorro or San Benedicto. Neither are mentioned in the GVP for around that time, not even ‘uncertain’ ones.

      Like

      • What is surprising also was that Humboldt wrote in french. But at the time (1811) Germany was problably part of the Napoleonic empire.

        Like

        • In this case, that wasn’t the reason. One of Humboldts ideas was that science cannot be done single-handedly, that only a network of different disciplines can achieve best results. He found such a network of scientists in Paris, where he lived for 23 years after the return from his expeditions to work out his chronological notes into books of scientific essays. His work has then been printed completely only by a French publisher. He authorised German editions of some of the 30 volumes, and translations into other languages, but the original pages we find on the internet would mostly be from that complete French edition.

          Like

  3. Aha! It looks like Bogoslof has indeed started to build something within the new bay: the latest shoreline (yellow, 01/18) looks much different than the green line from two days earlier. I wonder what the big explosion yesterday has produced above sea level, considering that thermal anomalies had been detected!

    AVO: “Analysis of shoreline changes at Bogoslof volcano due to eruptive activity. The base image is from 11 January 2017 and the shore lines on 16 and 18 January 2017 are noted by the green and salmon dashed lines, respectively. Note that the 18 January analysis was conducted before the explosive event on that day.”

    http://avo.alaska.edu/images/image.php?id=103911

    Like

    • I really look forward to seeing the next photos!
      “The presence of an ash cloud has led scientists to speculate that the vent might now be above sea level, but there is no direct evidence. Still, the island is changing shape with every large eruptive event. Thermal data (not pictured) show high temperatures for the first time, a clue that lava might be finding its way to the surface above the water line.”
      http://earthobservatory.nasa.gov/IOTD/view.php?id=89476

      Like

  4. Changbaishan: A quite precise date for its VEI 7 eruption could be worked out from a fossilized tree trunk buried in PF deposits: Guardian article.

    Like

  5. Hello everyone, good post, I still read, just don’t comment as much as I used to (usually the posts are so thorough, there isn’t much to comment on)! Just thought I’d let you guys know I started my own volcano website a few weeks ago. It’s still slightly under construction, but I hope you guys like it and visit me every once in a while 🙂 .

    http://big-volcanic.com/

    Like

    • Hi cbus, thanks! Your blog looks good, haven’t read all posts yet but I certainly will, and will keep an eye on it too. Good luck!

      Like

      • If you like it, please feel free to add my website as a resource, would be helpful in trying to launch the site. I’m going to add you guys when i get around to putting together a page / section of good blogs / resources for volcanoes.

        Like

  6. AVO has just raised alert for Takawangha volcano to YELLOW/ADVISORY. “An energetic earthquake swarm on Tanaga Island started yesterday, January 23, and is continuing. The earthquakes locate 6 to 7 km ESE of Takawangha Volcano. This activity may be due to brittle failure in the surrounding rock caused by magma movement. AVO is therefore raising the Aviation Color Code to Yellow and Alert Level to Advisory for Takawangha Volcano. No eruptive activity has been detected in satellite data. […] No historical eruptions are known from Takawangha; however, field work shows that recent eruptions have occurred and it is possible that historic eruptions attributed to Tanaga may instead have come from Takawangha.” http://www.avo.alaska.edu/activity/Takawangha.php

    Lake-filled crater at Takawangha’s summit. (img: AVO)

    Like

    • Last eruption is believed to be around 1550 (~450 years ago). This is similar to a swarm at Tanaga in 2005. Could be interesting!

      In other news, Erta Ale seems to be going haywire at the moment. Significant lava lake overflows and sizable crater collapses.

      Like

    • I somewhat wonder if there would be any way to see an eruption there if it were to occur. The problem with the Aleutians is that they’re so remote, we may not even see a significant eruption were it to occur.

      Like

      • AVO has a webcam on Adak Island pointed west to watch Kanaga volcano. A decent plume should be visible on that, a little left of Kanaga. The cam is not listed on their current webcam page and has been off for months, but it’s working again today. I guess they’re thinking along those lines too. They will have problems to be certain if the plume is coming from Kanaga or Takawangha, though, it’s a long shot so to speak… Otherwise, probably as with Bogoslof, satellites, lightning, pilots’ pireps etc. http://www.avo.alaska.edu/webcam/kanaga.jpg

        Like

  7. Howdy all – article in Science Daily about Toba. There is a difference in oxygen isotope abundance across individual chunks of ash. This is thought to indicate that something large changed in the magma chamber shortly before the eruption. The guess is that a large amount of surrounding rock was melted which changed the isotope ratios. That rock also contained a large amount of water which then No explanation why a large amount of surrounding rock would suddenly melt, although a good guess would be an injection of a large amount of hot basalt into the magma chamber. Cheers –

    https://www.sciencedaily.com/releases/2017/01/170126081631.htm.

    Like

  8. It seems Bogoslof island has more than doubled its land surface since the eruption began. I wonder if that is all uplift or if it is already lava built up on top of the previous ground? Could be both, as there have been thermal anomalies.

    Development of Bogoslof island until Jan. 24 side by side. AVO: http://tinyurl.com/jfz6tez

    Like

  9. Pingback: Islas REVILLAGIGEDO (MX) 2 – SOCORRO VOLCANO | VOLCANO HOTSPOT

Your thoughts?

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s