Representation of Time-Space Distribution of Seismic Data by Personal Computer

Abstract

BASIC program, which represents a lot of seismic data on the display of personal computer by several methods, is reported in this paper. The seismic data from 1926 to 1989 used in this program is quoted from ‘Rika Nenpyo’ and ‘Zisin’ (J. Seism. Soc. Jap.), which is based on JMA data. Any part of this data is able to be selected by input parameters and to be represented by some method. The methods of representation are as follows: (1) Time sequence distribution of magnitude of earthquakes, (2) Secular change of released energy by seismic wave, (3) Horizontal distribution of epicenters, (4) Distribution of seismic focuses with plots on three-side sectional maps, (5) Distribution of focuses with plots in 3-dimensional block diagram. By using this program, students' understanding of the occurrence pattern of earthquakes may be deepened.