Earthquake scaling, fault segmentation, and structural maturity

Details Earthquake scaling, fault segmentation, and structural maturity Earthquake scaling, fault segmentation, and structural maturity

Jan 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007e%26psl.253..429m&link_type=abstract

Earth and Planetary Science Letters, Volume 253, Issue 3-4, p. 429-438.

Mathematics

Logic

11

Scientific paper

Slip and length measurements on earthquakes suggest large stress drop variability. We analyze an extended set of slip-length measurements for large earthquakes (M ≥ 6) to seek for the possible origin(s) of this apparent variability. We propose that such variability arises from earthquakes breaking a variable number of major fault segments. That number depends on the strength of the inter-segment zones, which itself depends on the structural maturity of the faults. We propose new Dmax L parameterizations based on that idea of multiple segment-ruptures. In such parameterizations, each broken segment roughly scales as a crack, while the total multi-segment rupture does not. Stress drop on individual segments is roughly constant, only varying between 3.5 to 9 MPa. The slight variation that is still observed depends on fault structural maturity; more mature faults have lower stress drops than immature ones. The new Dmax L functions that we propose reduce uncertainties with respect to available relationships. They thus provide a more solid basis to estimate seismic hazard by integrating fault properties revealed by geological studies.

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