Physics – Geophysics
Scientific paper
Jun 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30l..20f&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 12, pp. 20-1, CiteID 1618, DOI 10.1029/2002GL016454
Physics
Geophysics
3
Marine Geology And Geophysics: Midocean Ridge Processes, Seismology: Earthquake Dynamics And Mechanics, Seismology: Seismic Hazard Assessment And Prediction, Seismology: Seismicity And Seismotectonics
Scientific paper
In a four and a half hour period, more than 60 events in an earthquake swarm on the western boundary of the Easter microplate were detected by an array of ocean bottom seismometers. The larger events of the swarm were strike-slip earthquakes located on two transform faults separated by about 25 km. Slip on the faults was closely coupled, with activity alternating back and forth randomly between the two transforms. Coupled seismic activity is usually attributed to triggering by static stress changes or dynamic stresses in propagating shear waves generated by another earthquake, but these earthquakes are too small for either mechanism to be plausible. We suggest that the swarm may have been the seismic manifestation of a larger, primarily aseismic, slip event or slow earthquake involving both transforms, perhaps triggered by dike injection on the Easter-Pacific spreading center.
Forsyth Donald W.
Mangriotis Maria-Daphne
Shen Yang
Yang Yingjie
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