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Comprehensive model of short‐ and long‐term slow slip events in the Shikoku region of Japan, incorporating a realistic plate configuration
Author(s) -
Matsuzawa Takanori,
Shibazaki Bunichiro,
Obara Kazushige,
Hirose Hitoshi
Publication year - 2013
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/grl.51006
Subject(s) - slip (aerodynamics) , term (time) , geology , subduction , episodic tremor and slip , seismology , cutoff , physics , tectonics , quantum mechanics , thermodynamics
We numerically simulate slow slip events (SSEs) in the Shikoku region of Japan, incorporating the configuration of the subducting plate. We adopt a rate‐ and state‐dependent friction law with cutoff velocities, assuming a frictional parameter distribution based on observed long‐term SSEs and nonvolcanic tremors that reflects the slip of short‐term SSEs. Our model reproduces recurrences of long‐ and short‐term SSEs and segments of short‐term SSEs. In our simulation, short‐term SSEs' transition from episodic to continuous slip is reproduced. This feature is consistent with tremor activity recently reported in both Shikoku and Cascadia. In addition to the long‐term SSEs in the Bungo Channel, our model also reproduces newly found long‐term SSEs in central Shikoku and predicts that these SSEs recur during the interseismic period between megathrust earthquakes. Our model comprehensively reproduces various SSEs and their characteristics as reported in the Shikoku region.