Redoubt webicorder

I didn't realize that there was actually a name for the online digitized seismograms I have shown from time to time. According to the Alaska Volcano Observatory (AVO), these are called webicorders.

Mt. Redoubt has been spewing ash, and the AVO has reports, tweets, photos, videos. But of course, here, we need to focus on seismograms of those harmonic tremors that accompany themagma moving in the volcano.

The webicorder at Redoubt is pretty intense right now. Have a look. The image at the time of this blog entry is shown below. Click on it for an enlarged image.

Has it blown yet?

Redoubt Volcano seismograph locations:

Click on above for larger version
from Alaskan Volcanological Observatory

The current seismogram at AVO can be seen here. Notice all the activity, the fairly constant amplitude, and the high frequency signals.

If you live in Anchorage, better buy your goggles and dust mask!

"It's gonna blow... Volcano"

(Lyrics from the pop song Volcano, by Presidents of the United States of America)

I only have time for a short entry, but it looks like Mt. Redoubt in Alaska may erupt. One of the omens is the occurrence of harmonic tremors that accompany movement of magma through a volcano. Volcano seismicity is physically different from the tectonic earthquakes that we usually talk about.

Check out the situation at the Alaska Volcano Observatory.

Photo: Redoubt Volcano from the AVO observation hut. The dark flow was growing while work was performed on the Redoubt webcam. Taken 27 Jan., 2009. (www.avo.alaska.edu)