地震発生と時の流れ

―第1部浅い大規模地震(M>7.45)のモルフォロジー―

抄録

If the earthquake phenomena are caused by the external force as the result of the large scale internal activities of the Earth which are steady and continuous in the geophysical time scale, such phenomena should indicate the progress of time in considerably certain accuracy in the crust and the uppermost mantle of similar physical properties. In this point of view, the writer reported several papers. In the present paper, the writer arranged the points of arguments of the former reports and established the following five a priori hypotheses: 1) Gutenberg-Richter's formula of N. 2) The precursor duration time T is inversely proportional to N. 3) The general idea of the earthquake province-domain is proposed, and in one province NT=1. 4) Giant earthquakes (>8.05) occurr sequentially. 5) The maximum scale of giant earthquakes Mmax=8.40.4) and 5) are partly established by evidencies.These hypotheses must be a posteriori verified. In the Part 1 of this report, the writer examined the erathquakes occurred from 1600 A. D. to the recent times near the main land of Japan, and the earthquakes along the Circum-Pacific zone from Kamchatka to Taiwan in the recent period. In the results, he attained the following conclusions: a) The activity of large earthquakes seems to begin after a quiet period of 30 or more years and ends in an average cycle of about 117 years±several years. b) At the end of the cycle, the relation NT =1 is concluded quite accurately. c) Giant earthquakes larger than 8.05 play the lead in large earthquakes, and the earthquakes of M8.05-7.45 display the supplementary activity. The total energy of giant earthquakes seems to be more than 60% of the total energy of earthquakes in the active seismic zone.