Volcano activity of October 30, 2012 – Vigorous deep low-frequency earthquake swarm beneath Mammoth Mountain CA

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This (almost) daily post intends to follow up the activity changes of volcanoes all over the world.
This post is written by geologist Richard Wilson who specializes in Volcano seismicity and Armand Vervaeck. Please feel free to tell us about new or changed activity if we haven’t written about it. -

October 30 , 2012 volcano activity

Just saw this developing tonight beneath Mammoth Mountain volcano CA.
While these events are not uncommon at Mammoth, this episode is especially vigorous and is accompanied by appreciable deformation
(extension) across the volcano. Deep low-frequency events occur in the middle to lower crust and are believed to be caused by the transit
of magma or magmatic fluids upward beneath volcanoes. Such episodes at Mammoth may be followed (within days to weeks) by shallow
earthquake swarms.

Rodger

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