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AGU: Geophysical Research Letters

 

Keywords

  • repeating earthquake
  • creeping
  • recurrence interval scaling

Index Terms

  • Seismology: Earthquake source observations
  • Seismology: Earthquake interaction, forecasting, and prediction
  • Seismology: Seismicity and tectonics

Abstract

GEOPHYSICAL RESEARCH LETTERS, VOL. 34, L16308, 5 PP., 2007
doi:10.1029/2007GL030554

Towards a universal rule on the recurrence interval scaling of repeating earthquakes?

Kate Huihsuan Chen

Department of Earth Sciences, National Cheng Kung University, Tainan, Taiwan

Robert M. Nadeau

Berkeley Seismological Laboratory, University of California, Berkeley, California, USA

Ruey-Juin Rau

Department of Earth Sciences, National Cheng Kung University, Tainan, Taiwan

A recent analysis of recurrence properties of small repeating earthquakes on a creeping oblique thrust fault in eastern Taiwan reveals a weak variation in recurrence interval (T r ) with seismic moment (M o ). Compared to the scaling of T r with M o from repeating earthquake data near Parkfield in California, the repeating data from eastern Taiwan has recurrence intervals that are 2 times shorter. Also in northeastern Japan, T r of repeating quakes are ∼4 times shorter than those expected from the Parkfield scaling law. When adjusted to account for differences in the geodetically derived slip rates for the three fault zones, however, the T r -M o scaling is remarkably consistent among the three regions. It suggests that the tectonic loading rate is likely the most important factor that controls the repeat time. It also suggests that there seems to exist a universal rule on recurrence interval scaling of repeating earthquakes in diverse tectonic settings.

Received 2 May 2007; accepted 30 July 2007; published 24 August 2007.

Citation: Chen, K. H., R. M. Nadeau, and R.-J. Rau (2007), Towards a universal rule on the recurrence interval scaling of repeating earthquakes?, Geophys. Res. Lett., 34, L16308, doi:10.1029/2007GL030554.

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