Study of the features of subsurface active faults; Features estimated from the damaging earthquakes, geological structure and diastrophism

Nohara, Tsuyoshi; Nakata, Takashi*; Sagiya, Takeshi*; Kinoshita, Hirohisa; Shimada, Koji

no journal, , 

Features of subsurface active faults are studied using data of the damaging earthquake, geological structure and diastrophism. It is considered that the scales of the subsurface active faults are not more than 6.6 (Mw). The hypocenter of the damaging earthquakes distribute around the Quaternary volcanoes and the active faults. The direction of strike and displacement of the active faults and the earthquake faults of the damaging earthquakes occurred around the active faults are almost same. The dispersion of the deformation of the mylonite zone related to geological condition may be one of the indicators of generation of subsurface active fault. GPS data analysis for the Atotsugawa fault can be confirmed the activity of this active fault zone. GPS data do not indicate the presence of many unknown subsurface active faults.