Journal
GEOPHYSICAL JOURNAL INTERNATIONAL
Volume 196, Issue 3, Pages 1754-1769Publisher
OXFORD UNIV PRESS
DOI: 10.1093/gji/ggt478
Keywords
Earthquake ground motions; Earthquake source observations; Computational seismology
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Funding
- NERA project (Network of European Research Infrastructures for Earthquake Risk Assessment and Mitigation) from the 7th Framework Programme by the European Commission
- French 'Agence Nationale de la Recherche' [ANR-2001-BS56-017]
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We analyse the scaling and distribution of average dynamic source properties (fracture energy, static, dynamic and apparent stress drops) using 31 kinematic inversion models from 21 crustal earthquakes. Shear-stress histories are computed by solving the elastodynamic equations while imposing the slip velocity of a kinematic source model as a boundary condition on the fault plane. This is achieved using a 3-D finite difference method in which the rupture kinematics are modelled with the staggered-grid-split-node fault representation method of Dalguer & Day. Dynamic parameters are then estimated from the calculated stress-slip curves and averaged over the fault plane. Our results indicate that fracture energy, static, dynamic and apparent stress drops tend to increase with magnitude. The epistemic uncertainty due to uncertainties in kinematic inversions remains small (phi similar to 0.1 in log(10) units), showing that kinematic source models provide robust information to analyse the distribution of average dynamic source parameters. The proposed scaling relations may be useful to constrain friction law parameters in spontaneous dynamic rupture calculations for earthquake source studies, and physics-based near-source ground-motion prediction for seismic hazard and risk mitigation.
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