Physics
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3719305f&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 19, CiteID L19305
Physics
1
Seismology: Volcano Seismology (8419), Seismology: Earthquake Source Observations (1240), Seismology: Seismicity And Tectonics (1207, 1217, 1240, 1242)
Scientific paper
Yellowstone National Park experienced an unusual earthquake swarm in December-January, 2008-2009 that included rapid northward migration of the activity at 1 km per day and shallowing of the maximum focal depths from 12 to 2 km beneath northern Yellowstone Lake. The swarm consisted of 811 earthquakes, 0.5 < MW < 4.1, aligned on a N-S 12-km-long vertical plane of hypocenters. The largest earthquake of the swarm had a 50% tensile crack-opening source determined by a full waveform inversion that we interpret as a magmatic expansion component. In addition, GPS data revealed E-W crustal extension coincident with the swarm. Modeling of GPS and seismic data is consistent with E-W opening of ˜10 cm on a N-S striking vertical dike. Our interpretation is that the swarm was induced by magmatic fluid migration or propagation of a poroelastic stress pulse along a pre-existing fracture zone.
Chang Wu-Lung
Farrell Jamie
Puskas Christine M.
Smith Robert B.
Taira Taka'aki
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