Brown and Beroza Deep Tremor in Subduction Zones: The transition from stick-slip to stable sliding
Deep, non-volcanic tremor is a long-duration, low amplitude signal resembling volcanic tremor. The first report of the signal was in SW Japan (Obara, 2002) from high sensitivity (Hi-Net) velocity recordings. The Hi-Net array in Japan is composed of high sensitivity seismic stations and was installed...
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| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.618.8133 http://www.nsf-margins.org/Planning_and_review/White_Papers/Brown_and_Beroza.pdf |
| Summary: | Deep, non-volcanic tremor is a long-duration, low amplitude signal resembling volcanic tremor. The first report of the signal was in SW Japan (Obara, 2002) from high sensitivity (Hi-Net) velocity recordings. The Hi-Net array in Japan is composed of high sensitivity seismic stations and was installed across the Japanese archipelago after the 1995 Hyogoken-nanbu Earthquake by the National Research Institute for Earth Science and Disaster Prevention (NIED). The average spacing of Hi-Net stations is 20-30 km, and includes three-component seismometers buried at a depth of at least 100 m. The high quality of these instruments in tandem with comprehensive coverage across Japan enabled the NIED to discover tremor and explore the systematics of its behavior. Since its discovery in SW Japan, deep tremor has also been observed in other subduction zones such as Cascadia, Alaska and Costa Rica (Schwartz and Rokosky, 2007). Although ideally suited for detecting tremor, high sensitivity, borehole seismic instruments are not absolutely required. More recently it was shown that deep tremor in SW Japan consists of a swarm of low frequency earthquakes (LFEs). LFEs are small, slow earthquakes (Katsumata and |
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