THE DIFFERENCE IN THE COMPLEXITIES BETWEEN THE 1978 MIYAGIKEN-OKI EARTHQUAKE AND THE 1968 TOKACHI-OKI EARTHQUAKE FROM A VIEWPOINT OF THE SHORT-PERIOD RANGE :

• IIDA,Masahiro

  Earthquake Research Institute, University of Tokyo

• HAKUNO,Motohiko

  Earthquake Research Institute, University of Tokyo

Abstract

We here propose an inversion method that can be used to analyze the source-rupture process that corresponds to the short-period range which is important in the field of earthquake engineering. This method is based on the idea that the effects of a propagating path and an observation site need not be considered when the record of a small earthquake that has taken place in the same source region as the large earthquake is used as Green's function for the point source. From this, how short-period body waves are generated can be determined. Our method consists of two procedures : Many synthesized waves are produced by trial and error, then the extent of agreement of the synthesized waves with the recorded wave is examined with a special criterion. We have used the inversion procedure to investigate the detailed source-rupture processes of the 1978 Miyagiken-oki (Japan) and 1968 Tokachi-oki (Japan) earthquakes, based on the use of strong motion accelerograms. We have concluded that spatiotemporally the Tokachi-oki earthquake has a very complicated source-rupture process.

Journal

• Natural disaster science

  Natural disaster science 6 (2), 1-26,

  Japanese Group for the Study of Natural Disaster Science

Keywords

• Source-rupture process
• Inversion method
• Strong motion accelerogram

Details

• CRID: 1540009770402359808
• NII Article ID: 110002682731
• NII Book ID: AA10468285
• Web Site: http://dl.ndl.go.jp/info:ndljp/pid/10752627
• Text Lang: en
• Data Source:
  • NDL-Digital
  • CiNii Articles