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JDR Vol.4 No.2 pp. 111-117
(2009)
doi: 10.20965/jdr.2009.p0111

Paper:

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A Model of Earthquake-Generation Cycle with Scale-Dependent Frictional Property - Preliminary Results and Research Plan for a Project of Evaluation for Coming Tokai, Tonankai, and Nankai Earthquakes

Takane Hori*, Shin’ichi Miyazaki**, and Noa Mitsui*

*Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology

**Graduate School of Science, Kyoto University

Received:
December 28, 2008
Accepted:
March 30, 2009
Published:
April 1, 2009
Creative Commons License
Keywords:
Nankai trough, earthquake cycle, time predictable, scale dependence
Abstract
To estimate rupture timing and location for coming Nankai trough earthquakes, we must know the mechanism of variation in earthquake size and recurrence time. Recurrence time varies fairly widely, and shows “time-predictable” behavior based on historical data. We propose a conceptual model for reproducing recurrence-timing variation related to earthquake size. The model includes smaller patches in a larger patch where all patches are velocity-weakening. We assume that characteristic slip distance L under the rate- and state-dependent friction law depends on patch size. We test simple two-scale heterogeneity and reproduce time-predictable behavior. Results show that slip patterns among earthquake-generation cycles vary significantly. Within a seismogenic zone, afterslip occurs during interseismic periods of giant earthquakes rupturing the entire seismogenic zone.
Cite this article as:
T. Hori, S. Miyazaki, and N. Mitsui, “A Model of Earthquake-Generation Cycle with Scale-Dependent Frictional Property - Preliminary Results and Research Plan for a Project of Evaluation for Coming Tokai, Tonankai, and Nankai Earthquakes,” J. Disaster Res., Vol.4 No.2, pp. 111-117, 2009.
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