1977年9月30日の山崎断層の小地震に伴なった諸観測量の異常変化について

Abstract

A composite and co-operative observation project has been carried out since autumn of 1975, at the Yamasaki fault in Kinki District, Southwest Japan. This observation project is based on the"Earthquake Prediction Project of Japan", and called the observations at the test-field. Ourprogram includes observations of earthquake, crustal movement, radioactivity, level and componentof underground water, geomagnetism, earth current and others.At the time of an earthquake on Sept. 30, 1977, whose magnitude was about 4, anomalousphenomena were found out in several kinds of observations. This fact, that even such smallearthquake accompanied the precursors, is considered to show that observations in the test-fieldare useful for exercise of earthquake prediction.