Potency-magnitude scaling relations for southern California earthquakes with 1.0 < M L < 7.0

Details Potency-magnitude scaling relations for southern California earthquakes with 1.0 < M L < 7.0 Potency-magnitude scaling relations for southern California earthquakes with 1.0 < M L < 7.0

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002geoji.148f...1b&link_type=abstract

Geophysical Journal International, Volume 148, Issue 3, pp. F1-F5.

Astronomy and Astrophysics

Astronomy

9

Earthquakes, Fault Models, Seismicity, Seismic Stress

Scientific paper

Linear and quadratic scaling relations between potency P 0 and local magnitude M L for southern California earthquakes are derived using observed data of small events (1.0 < M L < 3.5) recorded in the Cajon Pass borehole and moderate events (3.5 < M L < 6.0) recorded by the broad-band TERRAscope/TriNet network. The derived relations are extended to M L = 7.0 and compared with observed potency-magnitude values of four earthquakes in the extended range. The results indicate that a linear scaling relation can describe accurately data extending only over 2-3 orders of magnitudes. The best-fitting slope of a linear log P 0 vs M L scaling for the small Cajon Pass events is about 1.0, while the slope for the 3.5 < M L < 6.0 events is about 1.34. A quadratic relation can fit the data well over the entire 1.0 < M L < 7.0 magnitude range. The results may be explained in terms of a continuous transition from a limiting scaling P 0 ~ (rupture area) for highly disordered small events, to a limiting scaling P 0 ~ (rupture area times slip) for crack-like large events. Such a transition is expected to characterize evolving seismicity on heterogeneous faults, where small events propagate in (and are arrested by) a rough fluctuating stress field, while large events propagate across a relatively smooth correlated field.

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