68.岐阜県中部地震-1969年9月9日-の余震観測

概要

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This earthquake occured on September 9, 1969. According to the J.M.A., the seismological data of it are as follows: origin time; 1969.9.9. 14h 15m 33.5s(J.S.T.) epicenter; 35°47'N, 137°04'E depth; Okm magnitude; 6.6 In order to examine the mechanism of its aftershocks, in addition to the Shinpukuji observation station being one of the routine satellite stations of the Inuyama Earthquake Observation Station, we set up three temporary stations at Onabi, Itoshiro and Oobora and carried out the observations from September 16, September 23 and October 6, respectively, to November 10, 1959. We have been able to determine the epicenters of 59 aftershocks by three temporary stations and the Shinpukuji station within the observation period. The epicenters of aftershocks determined precisely by means of four stations are distributed along a line which has a NW-SE trend as shown in Fig. 3. It may be thought that these aftershocks have mostly the same mechanism as that of the main shock, as shown in the push-pull distribution in Fig. 5.
1971-02-27