期刊
GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
卷 22, 期 2, 页码 -出版社
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020GC009329
关键词
GNSS; Japan Trench; Sagami Trough; slow slip event; subduction zone; Suruga Trough
资金
- JSPS KAKENHI [JP16K05536]
- Earthquake and Volcano Hazards Observation and Research Program - Ministry of Education, Culture Sports, Science and Technology (MEXT) of Japan
The study systematically examined slow slip events in central Japan and found significant differences in slip behavior along subduction zones. Many slow slip events can accommodate relative plate motion aseismically, with limited temporal correlations with other slow earthquakes and earthquake swarms.
Slow slip events (SSEs) along subduction zones play an important role in accommodating relative plate motion. SSEs interplay with large megathrust earthquakes and other slow earthquakes, including low frequency and very low frequency earthquakes. The Kanto and Tokai regions of central Japan host frequent slow and large earthquakes, with significant differences in slip behavior along the subduction zones in the Suruga Trough, Sagami Trough, and Japan Trench. In this study, we conducted a systematic search to estimate the fault models and durations of short-term SSEs using continuous Global Navigation Satellite System data collected from 1994 to 2020. We detected 176 potential SSEs with moment magnitudes of 5.3-7.0 and durations of 0-80 days from the time series. Along the Sagami Trough, two shallow regions at a depth of 10-20 km host M-w >= 6.5 SSEs off of the Boso Peninsula and accommodate most of the relative plate motion aseismically. Some SSEs also occur on the deep plate interface down to similar to 50 km without tectonic tremors. Along the Japan Trench, the cumulative slip of the SSEs exhibits a bi-modal depth distribution to avoid the large slip areas of past megathrust earthquakes at 30-40 km depth. The shallow SSEs are in the same depth range (10-30 km) as tectonic tremors, but are spatially separate from tremors along the trench. The detected SSEs have limited temporal correlations with other slow earthquakes and earthquake swarms, which suggests that many factors control the genesis of slow and regular earthquakes.
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