OBARA, Kazushige

Earthquake Research Institute

Office: ERI 1st building-508
TEL: +81-3-5841-8286
FAX: +81-3-5841-8265

Research Field

Observation seismology, Science of slow earthquakes, Study on seismic wave propagation

Current Research

Slow earthquakes, defined by anomalously long characteristic time, reflect a different slip regime than fast faulting of regular earthquakes, occur around the megathrust seismogenic zone on the subducting plate interface. The non-volcanic tremor was discovered in southwest Japan at first, then have been detected in some subduction zones. We study the occurrence mechanism of slow earthquakes and development of monitoring method for discovery of new seismic phenomena and precise detection of various slow earthquake activity in order to clarify the relationship between these slow earthquakes and megathrust earthquake.

Representative Publications

1. K. Obara, 2002, Nonvolcanic deep tremor associated with subduction in southwest Japan. Science, 296, 1679.
2. K. Obara and A. Kato, 2016, Connecting slow earthquakes to huge earthquakes, Science, 353, 253-257.
3. Hirose, H., Y. Asano, K. Obara, T. Kimura, T. Matsuzawa, S. Tanaka and T. Maeda, Slow Earthquakes Linked Along Dip in the Nankai Subduction Zone, Science 330, 1502 (2010).