Redoubt (above) is definitely taking its time. After catching everyone’s attention last week with seismic activity, melting of its snow cap and increased gas emissions, the volcano is still, well, doing all those things, but not erupting. AVO’s update are beginning to sound like a broken record:

“(2/3/09 04:10) Unrest at Redoubt Volcano is continuing with elevated seismicity well above background levels. The volcano has not erupted. A gas/observation overflight yesterday reported continued changes in the summit glaciers indicative of heating of the summit area. Photos from both the overflight and the hut webcam showed a small vapor plume at the summit. The web camera is now dark as our long winter night continues.”

It is amusing to catch a bit of snarkiness from the AVO staff at the end of the update but hey, if I was up posting at 4 in the morning, maybe I’d throw that in as well.
You can get an idea of what life might be like at the Alaska Volcano Observatory from this article on CNN. They talk to USGS volcanologist (and fellow Williams College alum)  Michelle Coombs who says that Redoubt is still predicted to erupt in the next days-to-weeks timeframe. However, this whole drama with Redoubt shows the challenges of predicting volcanic behavior: we can have these volcanoes wired and watched 24/7, yet when exactly it will erupt is still anyone’s guess. We still have a lot to learn about how magmatic systems behave and how that translates into eruptions, which is part of the reason why it is so exciting to study them!
With that, the wait continues.

8 responses to “Redoubt continues to keep us waiting”

  1. Thomas Donlon

    gg, I don’t think there is any known linkage between a Cascadia Mega Thrust quake which caused the 1700 tsunami and Redoubt.

  2. gg

    I remember the 1964 Good Friday earthquake. I was a child in Canada, and watched the teacups swinging on their hooks in the cupboard. I remember Mount St. Helen’s dropping ash on my city back in 1980. So, Redoubt is of great interest. Sure, it’s slow, but Mount St. Helen’s took a while, too. Could this be the “big one” that causes a tsunami on the west coast, like the one in 1700?

  3. Ross,
    To answer the first questions, I’m actually not sure how much pre-eruption seismicity there was during Redoubt’s last activity. However, to answer the second question, to my knowledge there isn’t a direct relationship between seismicity and the size of the eruption. I think it all depends on the magmatic system, the trigger for the eruption and the specific geologic setting of the volcano. We saw a lot of precursory seismic activity at St. Helens during its latest eruption that started in 2004, but that wasn’t a very large eruption when all was said and done.

  4. Ross

    How much precursorary seismisity was there to the 89-90 eruption? The eruptions this past summer of Okmok & Kasatochi had very little in the way of seismic signals before they erupted. Does the longer the elevated seimicity goes on mean there’s more magma in the system and therefore the larger potential eruption?

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Quote of the week

“It’s not far-fetched that almost everywhere in the world where you have volcanoes you have mythologies or new gods being created.”

~ Werner Herzog