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.
ASJC Scopus subject areas
- Earth and Planetary Sciences(all)