Report

Periodic Pulsing of Characteristic Microearthquakes on the San Andreas Fault

Science  09 Jan 2004:
Vol. 303, Issue 5655, pp. 220-222
DOI: 10.1126/science.1090353

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Abstract

Deep fault slip information from characteristically repeating microearthquakes reveals previously unrecognized patterns of extensive, large-amplitude, long-duration, quasiperiodic repetition of aseismic events along much of a 175-kilometer segment of the central San Andreas fault.Pulsing occurs both in conjunction with and independent of transient slip from larger earthquakes.It extends to depths of ∼10 to 11 kilometers but may be deeper, and it may be related to similar phenomena occurring in subduction zones.Over much of the study area, pulse onset periods also show a higher probability of larger earthquakes, which may provide useful information for earthquake forecasting.

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