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October 2009 Yellowstone Seismicity Summary

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avatar October 2009 Yellowstone Seismicity Summary
November 02, 2009 04:06PM
October 2009 Yellowstone Seismicity Summary

During the month of October 2009, 218 earthquakes were located in the Yellowstone National Park region. The largest event was a magnitude 2.5 on October 15 at 3:39 PM MDT, located about 7 miles south southeast of West Thumb, Yellowstone NP. This event was the largest event in a swarm of 138 earthquakes that occurred October 12-23, with magnitudes ranging from -0.2 to 2.5.

Earthquake activity in the Yellowstone region is at relatively normal background levels.

Ground Deformation Summary: Continuous GPS data show that uplift of the Yellowstone Caldera has stopped for now. The WLWY station, located in the northeastern part of the caldera, underwent a total of ~23 cm of uplift between mid-2004 and mid-2009. Its record can be found at: http://pboweb.unavco.org/shared/scripts/stations/?checkkey=WLWY&sec=timeseries_plots&timeseries=raw

The general uplift and subsidence of the Yellowstone caldera is of scientific importance and will continue to be monitored closely by YVO staff.

An article on the recent uplift episode at Yellowstone and discussion of long-term ground deformation at Yellowstone and elsewhere can be found at: http://volcanoes.usgs.gov/yvo/publications/2007/upsanddowns.php

Edited 1 time(s). Last edit at 11/03/2009 03:41PM by eeek.
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