Vol.44-6 ABSTRACT6

Abstract

The Hyogoken-Nanbu (Kobe) Earthquake in 1995 caused the Nojima fault to appear on the ground in Awaji island, Japan. The fault was a right-lateral fault with a reverse component. The maximum displacement measured on the ground along the fault was 1.7 meters in the horizontal (right-lateral) and 1.3 meters in the vertical direction in Nojima-Hirabayashi.
 The detailed measurement of ground surface displacements around a fault as been only available as a relative movement of one side of the fault against the other. The authors succeeded in measuring three-dimensional displacements of 880 points around the Nojima fault by employing air photos of before and after the earthquake.
 The characteristics of the measured displacements are: 1) on the northwestern side of the fault, the horizontal displacement is directed toward the east, but the magnitude and direction of the vertical displacement change in a complex manner; and 2) most horizontal displacements on the southeastern side are more than one meter and is directed toward the south or southeast. In addition, large displacements can be found even in areas over one kilometer form the fault line.