Structural constraints on the spatial distribution of aftershocks

Details Structural constraints on the spatial distribution of aftershocks Structural constraints on the spatial distribution of aftershocks

Jun 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30l..12m&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 12, pp. 12-1, CiteID 1610, DOI 10.1029/2003GL017225

Mathematics

Logic

13

Seismology: Earthquake Dynamics And Mechanics, Seismology: Seismic Hazard Assessment And Prediction, Seismology: Seismicity And Seismotectonics

Scientific paper

Calculations of static stress changes due to large earthquakes have shown that the spatial distribution of aftershocks is predictable to first order, with aftershocks primarily occurring in areas experiencing positive stress changes. Delineation of these areas relies on resolving the stress perturbation onto planes with known orientations; common practice is to use poorly constrained regional stress information to compute optimally oriented failure planes, assuming that they exist everywhere. Here we show that this assumption is not supported by observation but rather that aftershock failure planes are controlled by geological structure. We argue that useful aftershock hazard estimates are better made by replacing information on regional stress with statistical measures of structural orientations.

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