Eruptions

Is something up at Shishaldin?

Posted by Erik Klemetti on July 16, 2009
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Shishaldin volcano in Alaska.

Yesterday I mentioned in the SI/USGS Weekly Report update that things appear to be afoot at Shishaldin in the Aleutians. Well, I checked the Shishaldin webicorder today and indeed, [SPECULATION] something seems suspect. Now, the increasing signal might be wholly unrelated to any magmatic activity, but it is interesting to see an increase in the seismicity after the increase in the intensity of thermal anomaly at the summit crater.

AVO’s latest statement (from yesterday) seems to think that nothing too much is up:

Cloudy conditions prevented views of Shishaldin today but it is likely that the thermal anomaly persists at the summit crater. Seismic, deformation, and gas emission data do not show anything abnormal at the volcano, and there is currently no indication that an eruption will occur. AVO will continue to carefully monitor activity at Shishaldin.

Shashaldin, located on Unimak Island, is possibly one of the most picturesque volcanoes on the planet. It is beautifully symmetrical and when covered with snow (as it is most of the time), it is a “textbook stratocone”. The volcano tends to produce explosive (strombolian) basaltic eruptions with some lava flows. Shashaldin may have had a small eruption in 2008, but the last confirmed eruption was in 2004, when a VEI 2 eruption produced explosions and some ash fall. In 1999, the volcano had a VEI 3 eruption that also produced lahars. Shilshaldin has been very active since the mid-1800s, so a new eruption at the volcano would definitely not be surprising.

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  1. #1 mike don
    July 16, 2009

    How weird is that? This Shishaldin post was added after I’d started composing my response on the SI report, but before it was submitted! BTW surely Shishaldin is on Umnak Island?

  2. #2 Erik Klemetti
    July 16, 2009

    Oops! It sure is on Unimak Island. I’ve been a little busy/distracted lately, but that is no excuse for misplacing a volcano.

    The more I look at the current webicorder, the more I think it has to be a wind/weather signal rather than anything volcano. Any webicorder denizens want to chime in?

  3. #3 SHIRAKAWA Akira
    July 16, 2009

    Spectrum analysis suggests that the increase in seismic activity as seen in webicorders may be due simply to bad weather. There’s a lot of broadband signal tipically associated with strong winds and rains. This is a picture of a section from today, from 6:30 to 18:30 UTC:

    http://i27.tinypic.com/2j1af05.jpg

  4. #4 EKoh
    July 16, 2009

    Great pic BTW. The peak is so symmetrical it looks like an intro textbook drawing. What is its eruptive history?

  5. #5 SHIRAKAWA Akira
    July 16, 2009

    > What is its eruptive history?

    Have a look here:
    http://www.avo.alaska.edu/volcanoes/volcact.php?volcname=Shishaldin

  6. #6 Erik Klemetti
    July 16, 2009

    Thanks for that info Akira. It reinforces my suspicion of the webicorder data. The second link I posted (http://www.avo.alaska.edu/images/valve/counts/Shishaldin.png) does at least show that over the last year or so, earthquakes are on the increase, so we might still be headed towards something …

  7. #7 doug
    July 16, 2009

    speaking of restless volcanoes, Im curious how one might interepret the recent uptick in low frequency earthquakes under Mr. Baker (WA state). See http://www.geophys.washington.edu/SEIS/PNSN/BAKER/bakerrec_eqs.html

    This is the first time I’ve noticed a cluster of these right under the volcanoe.

  8. #8 EKoh
    July 16, 2009

    Thanks Akira, I should’ve looked further in the AVO site. Its as I suspected based on the lack of any noticeable erosion.

    Doug, a lot of the quakes on Mt. Baker have very shallow reported depths, they could be due to mass wasting events on the southern slope.

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