Slip-weakening distance estimated at near-fault stations

Details Slip-weakening distance estimated at near-fault stations Slip-weakening distance estimated at near-fault stations

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3409302f&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 9, CiteID L09302

Physics

2

Seismology: Earthquake Dynamics (1242), Seismology: Earthquake Source Observations (1240), Tectonophysics: Dynamics And Mechanics Of Faulting (8004)

Scientific paper

We estimated the slip-weakening distance from the seismograms recorded at near-fault stations, considering the effect of spatio-temporal filtering for a continuous propagation of rupture. This effect is usually observed at some distance away from the fault. We used a Green's function for 2-D anti-plane rupture propagating with constant rupture velocity and instantaneous slip at the crack tip. As a source time function, we used a regularized Yoffe function which is a kinematically good approximation of dynamic slip-weakening behavior. By convolving these functions, near-fault waveforms are computed. As a proxy of slip-weakening distance (D c ), we used D c ', which is defined as a slip at the time of peak slip velocity. Then, D c ' values can be computed as a function of the distance from the fault. This procedure is applied to the observation of the 2000 western Tottori, Japan, earthquake (M W 6.6) as well as the 2002 Denali, Alaska, earthquake (M W 7.9). We estimated D c ' at about 0.3 m at GSH station (~100 m away from the fault) for the Tottori earthquake and that at about 2.5 m at PS10 station (~3 km away from the fault) for the Denali earthquake. We confirmed that both estimates are not affected by the spatio-temporal smoothing.

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