Dynamics and rapid migration of the energetic 2008-2009 Yellowstone Lake earthquake swarm

被引：39

作者：

Farrell, Jamie ^{[1
]}

Smith, Robert B. ^{[1
]}

Taira, Taka'aki ^{[2
]}

Chang, Wu-Lung ^{[3
]}

Puskas, Christine M. ^{[1
]}

机构：

[1] Univ Utah, Dept Geol & Geophys, Salt Lake City, UT 84112 USA

[2] Univ Calif Berkeley, Berkeley Seismol Lab, Berkeley, CA 94720 USA

[3] Natl Cent Univ, Dept Earth Sci, Jhongli 32001, Taiwan

来源：

GEOPHYSICAL RESEARCH LETTERS | 2010年 / 37卷

关键词：

BENEATH; CALIFORNIA; INTRUSION; VOLCANO; CALDERA;

D O I：

10.1029/2010GL044605

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Yellowstone National Park experienced an unusual earthquake swarm in December January, 2008-2009 that included rapid northward migration of the activity at I 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 < M(W) < 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 F W crystal extension coincident with the swarm. Modeling of GPS and seismic data is consistent with E W opening of similar to 10 cm on a N S striking vertical dike. Our interpretation is that the swami was induced by magmatic fluid migration or propagation of a poroelastic stress pulse along a pre existing fracture zone. Citation: Farrell, J., R. B. Smith, T. Taira, W.-L. Chang, and C. M. Pashas (2010), Dynamics and rapid migration of the energetic 2008-2009 Yellowstone Lake earthquake swarm, Geophys. Res. Lett., 37,L19305, doi:10.1029/2010GL044605.

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