PRELIMINARY STUDY OF THE SEISMIC CODA PRECURSOR CHARACTERISTICS OF LINGWU-WUZHONG REGION IN NINGXIA
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    Abstract:

    In this paper, on the basis of K.Aki's theory of coda, with the data of three component seismic records from the seismic network, Qc value for the upper crust medium, α value for the amplitude attenuation coefficient and m value for the attenuation exponent of the coda predominant frequency versus time after origin are continuously estimated, and their errors are also appraised, around three moderate earthquakes of Lingwu-Wuzhong region in Ningxia. As a result, Qc value increases about 30% of the normal value, α and m value decrease or first decrease and then increase in aforesaid region. before the moderate earthquakes. It shows that it is possible to gain some precursor informations of strong earthquakes from the feature changes of coda physical quantity with the regional seismic record if the available data are properly and timely processed.

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History
  • Received:January 23,1989
  • Revised:
  • Adopted:
  • Online: June 30,2017
  • Published: