WAVEFOR MANOMALY PRIOR TO THE SONGPAN EARTHQUAKE AND ITSVALUE TO SHORT-IMMINENT PREDICTION OF STRONG EARTHQUAKES
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    Abstract:

    This paper deals with the morphological features of waveform anomaly recorded at several stations before the M7.2 Songpan earthquake of 1976, and the space-time distribution fea-tures. The anomalous waveforms can be divided into four types: the anomalous waveforms were recorded in verying degrees at all stations (epicenter distance within 80 km); the numbers of the waveforms were increased during the approaching of the earthquake; the amplitude was en-larged; the waveforms were densified ten days before the earthquake with obvious skipping changes. Finally, according to the features of the waveform anomaly, the physical mechanism of the anomalous waveforms was studied preliminarily. It shows that the appearance of the wave-form anomaly results from the rock microfracturing in seismogenic area before the earthquake.

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History
  • Received:October 26,1993
  • Revised:
  • Adopted:
  • Online: July 04,2017
  • Published: