SOME PRECURSORS PRIOR TO RECENT GREAT EARTHQUAKES ALONG THE NANKAI TROUGH

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To get suggestions for the researches of earthquake prediction in Tokai district, short-term precursors prior to the recent great earthquakes along the Nankai trough are investigated here. <BR>The Tonankai earthquake. The anomalous tilt of the ground had been observed several hours before the occurrence of that earthquake by a leveling party surveying in Tokai district. The party said also that they recognized with a level unusual quakes of the ground just before the earthquake. It is interesting that the similar phenomena were reported by two survey parties in China. <BR>The Nankai earthquake. From the analysis of hourly value of tidal records, precursory land uplift prior to the earthquake was recognized in the southwest coast of Shikoku. Although the reliability of that uplift was not so high, another precursory phenomena, abnormal changes in the ground water, had occurred in several wells in the area. It is, therefore, probable that there occurred significant changes in the crustal stress and strains prior to the earthquake. <BR>It is noteworthy that those precursors were observed in the areas near the boundary of the focal regions of the earthquakes.

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