Estimation of internal friction angle of subduction zone in northeast of Japan by using seismic focal mechanisms

Ayumu Miyakawa1, Katsushi Sato2 and Makoto Otsubo1,3, (1)Geological Survey of Japan, AIST, Tsukuba, Japan, (2)Kyoto University, Kyoto, Japan, (3)USGS, Menlo Park, CA, United States