Physics
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3708301g&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 8, CiteID L08301
Physics
9
Seismology: Earthquake Dynamics (1242), Seismology: Seismicity And Tectonics (1207, 1217, 1240, 1242), Tectonophysics: Dynamics And Mechanics Of Faulting (8004), Tectonophysics: Stresses: Crust And Lithosphere, Tectonophysics: Subduction Zone Processes (1031, 3060, 3613, 8413)
Scientific paper
During the slow slip events in Cascadia and Japan, a well-documented feature of nonvolcanic tremor (NVT) is its puzzling slow along-strike migration. But the cause, possible implications, and underlying physics of this long-term tremor migration and its relationship with slow slip remain elusive. Here, we use tremor data recorded by a dense seismic array in Cascadia, and apply a beam-backprojection technique to map the spatiotemporal evolution of tremor with high resolution. It reveals that elongated slip-parallel bands of tremor activity illuminate the slipping part of the plate interface over the time-scale of several hours, and sweep Cascadia along-strike from south to north. We propose that small changes in static stress due to slow slip in a section of the fault cause slip and associated NVT activity in the adjacent section, and the resulting progressive along-strike transfer of stress is responsible for the long-term tremor migration during a slow slip event.
Creager Kenneth C.
Ghosh Abhijit
Houston Heidi
Sweet Justin R.
Vidale John E.
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