Precise maps of the surface deformation associated with the Iwate-ken Nairiku Hokubu earthquake on September 3, 1998

概要

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The earthquake fault associated with the Iwate-ken Nairiku Hokubu earthquake were appeared along the existing active fault. It stretches in the direction of N-S approximately 800 meters. Some surface ruptures observed in paddy field and grass land. We made precise maps on a scale 1: 100 at three sites in order to obtain fault micro topography. The result are as follows; (1) The vertical displacement was ca.40 cm in central part of the earthquake fault, but it became 25-30 cm at the both ends part of it. (2) The surface of foot wall were flat. (3) A shallow depression appeared on the surface of hanging wall, and maximum depth of it were 10 cm. (4) A tectonic bulge appeared along the earthquake fault.
Japanese Society for Active Fault Studiesの論文