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Hypocenter maps (flat patterns, east-west and north-south cross sections) in and around Japan Alps have been made to investigate the influence of the 2011 off the Pacific coast of Tohoku Earthquake (M9.0) on active faults and seismic activity in this region. Along Japan Alps consisting of South, Central and North Alps, the most active mobile belt in Japan, the Itoigawa-Shizuoka Tectonic Line Active Fault System (ISTL-AFS) is located. After the 2011 Earthquake, seismic activity has become more active along the ISTL-AFS in the northwest region of Lake Suwa, while in the south region of Lake Suwa seismic activity has not been almost observed along the ISTL-AFS but along the north-northwest - south-southeast (NNW-SSE) line in Japan South Alps, implying that unrecognized active faults along the NNW-SSE line may exist in Japan South Alps. The hypocenter maps reveal that two seismic gaps exist along the ISTL-AFS in the northwest region of Lake Suwa. The two seismic gaps may become triggers of the next large earthquakes. Moreover, no distinctive foreshock except some micro-earthquakes of |
