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Published Online November 30, 2006
Science DOI: 10.1126/science.1134454

Reports

Submitted on August 28, 2006
Accepted on November 3, 2006

Slow Earthquakes Coincident with Episodic Tremors and Slow Slip Events

Yoshihiro Ito 1*, Kazushige Obara 1, Katsuhiko Shiomi 1, Shutaro Sekine 1, Hitoshi Hirose 1

1 National Research Institute for Earth Science and Disaster Prevention, 3-1 Tennodai, Tsukuba 305-0006, Japan.

* To whom correspondence should be addressed.
Yoshihiro Ito , E-mail: yito{at}bosai.go.jp

We report on the very-low-frequency earthquakes occurring in the transition zone of the subducting plate interface along the Nankai subduction zone in southwest Japan. Seismic waves generated by very-low-frequency earthquakes with seismic moment magnitudes of 3.1-3.5 predominantly show a long period of approximately 20 s. The seismicity of very-low-frequency earthquakes accompanies and migrates with the activity of deep low-frequency tremors and slow slip events. The coincidence of these three phenomena improves the detection and characterization of slow earthquakes, which are thought to increase the stress on up-dip megathrust earthquake rupture zones.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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Laboratory Simulation of Volcano Seismicity.
P. M Benson, S. Vinciguerra, P. G Meredith, and R P. Young (2008)
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Science. ISSN 0036-8075 (print), 1095-9203 (online)