兵庫県南部地震により淡路島に生じた野島地震断層の調査 Investigation of the Nojima Earthquake Fault Occurred on Awaji Island in the Southern Hyogo Prefecture Earthquake.

On January17, 1995, the earthquake of magnitude 7.2 occurred in the southern Hyogo Prefecture, Japan. The Nojima Earthquake Fault 17km long was formed from Ezaki lighthouse at the northeastern end of Awaji island to Ichinomiya-cho, which occurred along the Nojima geological fault in the northern segment and as a new fault in the southern segment. The northern segment of the Nojima Earthquake Fault is composed of some subparallel shear faults and a lot of echelon extension cracks, and the southern segment consists of some discontinuous surface ruptures.<BR>The Nojima Earthquake Fault shows a general trend striking N30°-60°E, dipping 75°-85°E. The topographical deformation and striations on the fault plane generated during seismic faulting show that the Nojima Earthquake Fault is a right-lateral strike-slip fault with some thrust component. The largest displacements are 180cm in horizontal, 130cm in vertical, and 215cm in netslip measured at the Nojima Hirbayashi fault scarp.