A significant relation between seismic activities and reflection intensities in the Japan Trench region

There is a regional variation of seismicity in the Japan trench region characterized by cluster distribution of seismically active zones which persist for at least a few decades. We conducted seismic refraction‐reflection experiments there to clarify the relationship between seismicity and crustal s...

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Bibliographic Details
Published in:Geophysical research letters 2002-04, Vol.29 (7), p.4-1-4-4
Main Authors: Fujie, Gou, Kasahara, Junzo, Hino, Ryota, Sato, Toshinori, Shinohara, Masanao, Suyehiro, Kiyoshi
Format: Article
Language:English
Subjects:
Amplitudes
Boundaries
Plates (structural members)
Reflection
Seismic phenomena
Seismic surveys
Seismicity
Trenches
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Summary:There is a regional variation of seismicity in the Japan trench region characterized by cluster distribution of seismically active zones which persist for at least a few decades. We conducted seismic refraction‐reflection experiments there to clarify the relationship between seismicity and crustal structure. A velocity structure model was obtained by travel‐time inversion. Although there does not seem to be distinct relationship between seismicity and the bulk velocity structure, we found a good relationship between seismicity and variation of reflective amplitude. Large amplitude reflected waves generated at the plate boundary were observed at low seismicity region and vice versa.
ISSN:0094-8276
1944-8007
DOI:10.1029/2001GL013764