Peak ground velocity ShakeMaps derived from geodetic slip models

Details Peak ground velocity ShakeMaps derived from geodetic slip models Peak ground velocity ShakeMaps derived from geodetic slip models

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009geoji.179.1105r&link_type=abstract

Geophysical Journal International, Volume 179, Issue 6, pp. 1105-1112.

Astronomy and Astrophysics

Astronomy

Satellite Geodesy, Earthquake Ground Motions, Site Effects

Scientific paper

We develop a methodology to derive fast and reliable peak ground velocity (PGV) ShakeMaps from kinematic finite-source models of earthquake rupture inferred from geodetic static displacements. The temporal variations in slip on the fault are based on the simple assumption that larger slip takes longer time to accumulate. Assuming constant rupture and slip velocities, slip is distributed in time to produce a variable rise-time model. Sensitivity tests on finite-source models of the 1994 Mw 6.7 Northridge, California earthquake show that distribution of peak ground velocities derived using 3.0 km s-1 rupture velocity and 76.8 cm s-1 slip velocity matches, to a large extent, observed PGV, suggesting that rapid assessment of strong ground motions derived from geodetic data can aid emergency response, particularly in areas with sparse seismic station coverage.

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