Did expanded porous patches guide rupture propagation in 2003 Tokachi-oki earthquake?

Details Did expanded porous patches guide rupture propagation in 2003 Tokachi-oki earthquake? Did expanded porous patches guide rupture propagation in 2003 Tokachi-oki earthquake?

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3220310t&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 20, CiteID L20310

Physics

Geophysics

1

Mathematical Geophysics: Numerical Approximations And Analysis (4260), Mineralogy And Petrology: Fluid Flow, Seismology: Seismicity And Tectonics (1207, 1217, 1240, 1242), Seismology: Subduction Zones (1207, 1219, 1240)

Scientific paper

A time-lapse seismic reflection survey before and after the 2003 Tokachi-oki interplate earthquake (MW8.0) detected spatio-temporal evolution in reflectivity near the source area. From the evolution pattern and the aftershock observations, we attribute the change in reflectivity to gradual fluid flow, and estimate the subsequent permeability in the plate boundary shear zone to be 10-15 m2. The magnitude of the reflectivity change implies a 1.6% increase in porosity and a 2.2-5.6 MPa reduction in shear strength. As a hypothesis to test, we propose that expanded porous patches guided the seismic rupture propagation in the Tokachi-oki earthquake.

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