Seismicity and Geotectonics

Abstract

§ 1. Geographycal distribution of seismic activities over the whole world. Main seismic belts of the world. Geographical distribution of big earthquakes. Geographical distribution of intermediate and deep earthquakes. Vertical distribution of earthquake foci in the profile across seismic belts. Crustal and Subcrustal or upper-mantle earthquakes. Types of seismic belts of the world. (Oceanic type, Island arc type, orogenic-zone type, and continental-platform type.) Sub-division of seismic zones into minor seismic regions. § 2. Three-dimensional distribution of seismic activity in and near Japan. Three dimensional distribution of earthquake foci in and near Japan. Earthquake provinces defined by C. Tsuboi and the relations among them seen from stereometric distribution of foci belonging to each of them. § 3. Regionality of magnitude frequency relation of earthquakes. Characteristic behaviour of magnitude-frequency relation of big earthquakes in the main seismic belts of the world. Coefficient b of Gutenberg-Richter magnitude-frequency relation log N=a+b (8-M) and its geotectonic implications. § 4. Relations between geotectonic structure and seismicity in and near Japan. Island arcs meeting around Japan. Constitution of Honshu Arc. Seismo-tectonic zoning of Japan and her vicinity. § 5. Cycle of geotectonic development and its bearing on seismicity Relation between coefficients a and b in Gutenberg-Richter magnitude frequency formula. Geotectonic situation of seismic regions of the world represented in the a-b diagram. A proposed scheme of cycle of geotectonic development and development of seismic activity.

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