TY - JOUR
T1 - Dynamics and rapid migration of the energetic 2008-2009 Yellowstone Lake earthquake swarm
AU - Farrell, Jamie
AU - Smith, Robert B.
AU - Taira, Taka'Aki
AU - Chang, Wu Lung
AU - Puskas, Christine M.
PY - 2010/10/1
Y1 - 2010/10/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=77958487683&partnerID=8YFLogxK
U2 - 10.1029/2010GL044605
DO - 10.1029/2010GL044605
M3 - 期刊論文
AN - SCOPUS:77958487683
SN - 0094-8276
VL - 37
JO - Geophysical Research Letters
JF - Geophysical Research Letters
IS - 19
M1 - L19305
ER -