[Geysers] Seismic Activity

[Karen Low]

Well, I've looked at the map of where the quakes are (from usgs.neic.gov), and compared it to Dr. Lisa Morgan's maps of the Lake bottom that are part of USGS report 1717.  There is a thermal area marked where this swarm is happening.  The quakes seem to be mostly shallow.
 
I've talked with the interp at Grant who has felt them, and heard from people at Lake that have felt them.
 
At a guess (and remember I only have a BSc in Geology) it is probably hot briny fluid movement.  Dr. Bob Smith said at a lecture I attended that that is what causes most quakes here in the park.
 
I still haven't felt any quakes in the park in 2008, but I felt 5 in the park in 2007.
 
Karen Low

--- On Tue, 12/30/08, Jack Ashe <jack.ashe at yahoo.com> wrote:

From: Jack Ashe <jack.ashe at yahoo.com>
Subject: [Geysers] Seismic Activity
To: "Geyser Observation Reports" <geysers at lists.wallawalla.edu>
Date: Tuesday, December 30, 2008, 9:00 AM






Recent reports in the press about small quakes in Yellowstone. 
Does anyone know what the geologist perception of this swarm tends to suggest in Yellowstone? Not looking for prediction, just prevailing interpretation of this sort of seimic activity might mean in Yellowstone-- does it represent small movements along a single fault, multiple fractures at multiple sites, expansion, contraction,shearing parallel to surface, etc.?
 
Jack Ashe
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