地震活動の時間的・空間的変化の観察プログラム (EQMAP)

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書誌事項

タイトル別名
  • Computer Program for Observation of Time- and Space-variations of Seismicity
  • ジシン カツドウ ノ ジカンテキ クウカンテキ ヘンカ ノ カンサツ プログラ

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抄録

A computer program is reported which displays the time- and space-variation of seismicity in a chosen area. A refresh type computer graphic display unit is employed as a display unit for this purpose. This program has the following functions; (1) to draw a map of a particular area based on a prescribed map projection method; (2) to display the earthquakes. successively on the map in chronological order of occurrence; (3) to plot a symbol at the earthquake epicentre, which characterises the magnitude and focal depth of the event; (4) to erase the earthquake symbol from the display, after some specified time interval; (5) to display a time and date. During a run of the program, the following operations can be applied; (1) the display can be temporarily “frozen”; (2) the following parameters can be altered: (i) the ratio of real and simulation time; (ii) the duration of the display of each earthquake, (iii) the time and date.<br>Some results of display experiments are illustrated in this paper: (1) World Seismicity, particularly before and after the Kanto earthquake (2 Sept. 1923; M=7.9); (2) The seismicity of the Japanese islands, particularly before and after the Niigata earthquake (16 Jun. 1964; M=7.4), and (3) local seismicity in northeastern Japanese islands, particularly before and after the 1968-Tokachi-Oki earthquake (16 May 1968; M=7.9).<br>These experiments suggest that studies of the temporal variation of the pattern of seismicity are important because they allow: (1) recognition of some characteristic features. of earthquake occurrence, as a basis of all seismological studies; (2) an understanding of the nature of the present seismicity in the light of the past seismicity; (3) comparison of the results of laboratory experiments on the failure of materials with the real seismicity; (4) correlation of the seismicity with other natural phenomena such as volcanism, crustal deformation etc.; (5) the detection of hidden regularities in the seismicity pattern.

収録刊行物

  • 地震　第２輯

    地震　第２輯 31 (1), 49-62, 1978

    公益社団法人 日本地震学会

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