Departmental Bulletin Paper 南アルプス及び周辺地域の活断層分布と地震活動変化 その2
Distribution of active faults and change of seismic activity in and around Japan South Alps Part2

福地, 龍郎

1pp.175 - 182 , 2017-03-07 , 山梨大学教育学部
Hypocenter maps (flat patterns, east-west and north-south cross sections) in and around Japan South Alps have been made to investigate the influence of the 2016 Kumamoto earthquake (M7.3) on active faults and seismic activity in this region.Seisemic activity along the Gofukuji fault, which is one of the Itoigawa-Shizuoka Tectonic Line Active Fault System (ISTL-AFS) located at the north and east edges of Japan South Alps, is still active and micro-earthquakes increase along the Gofukuji fault after the 2016 Kumamoto earthquake.Among the Median Tectonic Line (MTL) located in the south area of Lake Suwa, more micro-earthquqkes occur after the Kumamoto earthquake.This meens that the seismic waves generated in the Kumamoto earthquake passed through the MTL, arrived at Lake Suwa and may have influenced on the seismic activity in this area.In Japan South Alps, active seismic activity occurs along the north-northwest - south-southeast (NNW-SSE) line, which is an extension line of the Gofukuji fault plane and is the ISTL as a geological tectonic line, implying the future large earthquakes may occur along this line rather than the ISTL-AFS.

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