Spatial migration of earthquakes within seismic clusters in Southern California: Evidence for fluid diffusion

Spatial migration of earthquakes within seismic clusters in Southern California: Evidence for fluid diffusion

Seismicity within many earthquake swarms is observed to migrate slowly with time, which may reflect event triggering due to slow fault slip or fluid flow. We search for this behavior in Southern California by applying a weighted least squares method to quantify event migration within 69 previously o...

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Veröffentlicht in:Journal of Geophysical Research: Solid Earth 2012-04, Vol.117 (B4), p.n/a
Hauptverfasser: Chen, X., Shearer, P. M., Abercrombie, R. E.
Format: Artikel
Sprache:eng
Schlagworte:
Diffusion coefficient
Earth sciences
Earth, ocean, space
earthquake migration
Earthquakes
Exact sciences and technology
Fluid flow
Geophysics
Least squares method
Plate tectonics
Reservoirs
Seismic activity
Seismology
slow slip
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Zusammenfassung:Seismicity within many earthquake swarms is observed to migrate slowly with time, which may reflect event triggering due to slow fault slip or fluid flow. We search for this behavior in Southern California by applying a weighted least squares method to quantify event migration within 69 previously observed seismicity bursts. We obtain best‐fitting migration directions and velocities, and compute a statistical migration significancesm for each burst using a bootstrap resampling method. We define 37 bursts with sm ≥ 0.8 as the migration group, and 32 bursts with sm 
ISSN:0148-0227
2169-9313
2156-2202
2169-9356
DOI:10.1029/2011JB008973