From earthquake centroid to spatial-temporal rupture evolution: Mw 6.3 Movri Mountain earthquake, June 8, 2008, Greece

Details From earthquake centroid to spatial-temporal rupture evolution: Mw 6.3 Movri Mountain earthquake, June 8, 2008, Greece From earthquake centroid to spatial-temporal rupture evolution: Mw 6.3 Movri Mountain earthquake, June 8, 2008, Greece

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3621310g&link_type=abstract

Geophysical Research Letters, Volume 36, Issue 21, CiteID L21310

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Computation

7

Seismology: Earthquake Source Observations (1240), Mathematical Geophysics: Inverse Theory, Mathematical Geophysics: Wave Propagation (0689, 2487, 4275, 4455, 6934), Computational Geophysics: Data Analysis: Algorithms And Implementation, Seismology: Theory

Scientific paper

We propose a new strategy to reveal the spatial-temporal evolution of the earthquake rupture process from near-regional data, without assuming a constant rupture velocity. The approach is based on a conjugate gradient method, for which we express analytically the required waveform-misfit derivative with respect to slip on the fault. The derivative is given by back-propagation of residual seismograms towards the source. A good initial source approximation is necessary, being obtained from hypocenter location and centroid-moment tensor solution. The iterative approach then gradually reveals major characteristics of the source process. As an application, we investigate a line source model of a damaging Mw6.3 earthquake in Greece, revealing predominantly unilateral rupture propagation and two or three main slip patches, one of which being significantly delayed, indicating a temporary rupture arrest. The region of largest slip coincides with the region of least abundant aftershocks between hypocenter and centroid. The method has application potential for shakemaps, emergency response, and/or aftershock hazard assessment.

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