In the past 24 hours — FOUR SEPARATE DORMANT VOLCANIC SITES in the Southwest USA have shown activity!
Starting in southwest Utah– 2/12/2012 (yesterday) — a swarm of earthquakes near the Markagunt Volcanic Plateau.
Here is the link to my full post plus video from earlier:
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link to sincedutch.wordpress.com]
Quoting: Luisport I think it all connected with trigger influence of some long-period seismic waves which extends across the extensive region including Utah, Oregon (see today quake) , North of California, ...
The example of this waves is resulted here
Thread: Strange vibrations or waves at Mary Lake Yell They are registered there from the end of January - the beginnings of February (and today too are visible
[
link to www.isthisthingon.org] thus if at first their period was 3-4 minutes then began to increase: at first till 5-6 minutes, now till 15 minutes .
If to assume that vibrations on seismograms are reaction of a stream of magma to waves, from the rough formula for vibrating waves
v=2*f*A (velocity, frecuency and amplitude)
and observing some increase in amplitude of vibrations at more or less identical frequency, it is possible to assume also increase in speed of a stream.
By the way, according to GPS the maximum speed just corresponds to station Mary Lake position
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link to earthquake.usgs.gov]