山崎断層安富観測坑における長周期伸縮変化の特徴

Abstract

The data were collected by Extensometers in Yasutomi Observation Tunnel at the Yama-saki Fault Observation Station from November 1975 to December 1982. The analyzed resultsare as follows.1) The amplitude of annual variation caused by the atmospheric temperature is about10-5 strain.2) The turning points of secular variation exist in 1978-1980 and in 1981-1982.3) These altered change seems to the results of Base Line Network Survey near thestation and seismic activity around the Yamasaki Fault.4) The movement of the fractured zone of the fault especially gives us useful informa-tions to investigate the general features of the fault, and the change of the stress field.