Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 40, Issue 19, Pages 5125-5130Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/grl.51006
Keywords
short-term slow slip event; long-term slow slip event; numerical simulation; Shikoku; Bungo Channel
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Funding
- Grants-in-Aid for Scientific Research [21107007, 25400452] Funding Source: KAKEN
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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.
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