京都市および上和知地震前後の地殻のひずみの観測

Abstract

There were about twenty sensible earthquakes felt around Kyoto City in a month after August18, 1968. At these days, speed changes of tiltings and extendings of the crust at Osakayama wereobserved since march, 1968. Furthermore, the forerunners seemed to appear about half a day andhalf an hour before both remarkable earthquakes. Especially, the forerunner in half an hour beforethe earthquake at Kyoto City was a simple expansion.The radii of these seismic origins, the rebounded. Energies and the seismic magnitudes of theseearthquakes were also calculated by means of the abrupt changes in the crustal strain during theseearthquakes.