[Geysers] Seismograms

[Michael Goldberg]

There was a small earthquake swarm this afternoon centered about 10 miles 
northwest of Old Faithful, with three events (so far) having magnitude 
between 2.5 and 2.7.  I've attached a copy of the current Old Faithful 
seismogram.

For comparison purposes I also attached a couple of seismograms of recent 
Giantess eruptions:

The July 6 eruption starts at 6:13 MST.  The large signal at 6:02 MST is 
from a distant 6.1 earthquake.

The October 14 eruption starts at 3:48 MST.  There are a handful of local 
earthquakes, like the one at 6:02 MST.  I would guess that the long 
duration signals at midday and late afternoon are weather-related noise.

If Giantess erupts during a rainstorm, I don't think we'd ever be able to 
tell from the seismic record.

Michael Goldberg
Michael.Goldberg at uc.edu
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