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Monitoring Yellowstone Earthquake Swarms

Date:
April 10, 2009
Source:
Seismological Society of America
Summary:
Analysis of the recent swarm suggests epicenters migrated north over the 12-day period and maximum hypocenter depths abruptly shallowed from 12 km to 3 km depth at the time of rapid cessation of activity on Jan. 7.

The Seismological Society of America (SSA) is an international scientific society devoted to the advancement of seismology and its applications in understanding and mitigating earthquake hazards and in imaging the structure of the earth.

The second largest earthquake swarm ever recorded in Yellowstone National Park occurred during the two weeks from 27 December 2008 and 7 January 2009 and included more than 1000 earthquakes. Analysis of the swarm suggests epicenters migrated north over the 12 day period and maximum hypocenter depths abruptly shallowed from 12 km to 3 km depth at the time of rapid cessation of activity on Jan. 7. Source properties of the swarm earthquakes suggest that the swarm may be due to the movement of hydrothermal fluids through pre-existing cracks, as suggested by recent analysis by University of Utah scientists.

The Yellowstone Volcano Observatory (YVO) was created as a partnership among the U.S. Geological Survey (USGS), Yellowstone National Park, and University of Utah to strengthen the long-term monitoring of volcanic and earthquake unrest in the Yellowstone National Park region. Yellowstone is the site of the largest and most diverse collection of natural thermal features in the world and the first National Park.

Title: Yellowstone earthquake swarms

Session: Volcano Monitoring Using Seismology and Complementary Methods

Location: Bonsai Ballroom, 9 April, 2009.


Story Source:

The above story is based on materials provided by Seismological Society of America. Note: Materials may be edited for content and length.


Cite This Page:

Seismological Society of America. "Monitoring Yellowstone Earthquake Swarms." ScienceDaily. ScienceDaily, 10 April 2009. <www.sciencedaily.com/releases/2009/04/090409134747.htm>.
Seismological Society of America. (2009, April 10). Monitoring Yellowstone Earthquake Swarms. ScienceDaily. Retrieved July 30, 2014 from www.sciencedaily.com/releases/2009/04/090409134747.htm
Seismological Society of America. "Monitoring Yellowstone Earthquake Swarms." ScienceDaily. www.sciencedaily.com/releases/2009/04/090409134747.htm (accessed July 30, 2014).

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