微小地震の震央分布と発震機構にもとづく断層系の推定

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Epicentral pattern analysis methods are introduced to detect fault systems from seismicity data, i.e., (1) an epicentral linkage pattern analysis method for a relatively short interval of time and (2) an epicentral zonal pattern analysis method with magnitude classifications. In the first method, epicentral data plotted on a map for every half a month give a basic material to reproduce characteristic epicentral linear patterns. The data procession mainly consists of making linkage systems of consecutive epicenters for each sequence of seismic activities. The method provides an effective technique to enhance linearments of an epicentral distribution depending on the frequency of recurrence. In the second method, epicentral data for the period of more than a few years are classificd into four groups in respect to magnitude ranges. In each of the magnitude ranges, earthquakes are located in separated areas where epicenters are concentrated with a high density when isolated smaller patches of epicentral groups are eliminated. The epicentral distribution thus obtained can be represented as a contour map showing the area where earthquakes of a given magnitude range are distributed. The method provides an effective technique to enhance the epicentral linear patterns which accompany representative earthquakes in a seismic region for a comparatively long interval of time. Small and micro-earthquakes in and around the Kii Peninsula, Central Japan have been precisely located by a high sensitivity network observation of Wakayama Micro-earthquake Observatory, ERI for the period from 1965 to 1973. The seismological data thus obtained are available for the pattern analysis of seismicity in special reference to the detection of active fault systems in north-western part of the Kii Peninsula.
1976-03-25

微小地震の震央分布と発震機構にもとづく断層系の推定

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