期刊
SCIENCE
卷 321, 期 5893, 页码 1194-1197出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1160250
关键词
-
资金
- Ministry of Education, Culture, Sports, Science and Technology of Japan
Subducting seamounts are thought to increase the normal stress between subducting and overriding plates. However, recent seismic surveys and laboratory experiments suggest that interplate coupling is weak. A seismic survey in the Japan Trench shows that a large seamount is being subducted near a region of repeating earthquakes of magnitude M similar to 7. Both observed seismicity and the pattern of rupture propagation during the 1982 M 7.0 event imply that interplate coupling was weak over the seamount. A large rupture area with small slip occurred in front of the seamount. Its northern bound could be determined by a trace of multiple subducted seamounts. Whereas a subducted seamount itself may not define the rupture area, its width may be influenced by that of the seamount.
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