5:15 PM - 6:30 PM
[SSS31-P16] Active faults around the Shimane Peninsula and their tectonic implications, northern Chugoku region, Japan
Keywords:Kashima fault, active fault, Chugoku, inland earthquake, submarine fault, aerial photograph
Based on the characteristics of the morphology of the Toretsu Mountains, we estimated the existence of northern-side-up concealed active faults with right-lateral slip along the southern margin of the Toretsu Mountains. We mapped three en echelon active faults in the Churetsu Mountains. We estimated that these active faults have right-lateral strike-slip components, based on right–lateral flection of stream valleys. We estimated that these active faults are secondary faults delivered from submarine active fault along the northern margin of the Churetsu Mountains. Along the southern margin of the Seiretsu Mountains, we estimated existence of northern-side-up concealed active faults, based on the characteristics of the morphology of the Seiretsu Mountain, as in the Toretsu Mountains.
East and west of the Shimane Peninsula, long submarine active faults with east-west strike are known. These active faults develops along the coastal area of the Shimane and Tottori Prefecture, and form large tectonic deformation belt over several 100 km. we estimated that active faults in the Shimane Peninsula are extension of these submarine active faults, and are constitute a part of the large tectonic deformation belt.