QUADRANT CHARACTERISTICS OF EARTHQUAKE PRECUR- SORS AND ITS THEORETICAL ANALYSIS
Song Zhiping
Xu Ping
Zhang Hongkui
Fan Zhiyong
Abstract：On the basis of quadrant features of the precursors in geo-electricity and deformation in the case of Tangshan earthquake and Datong earthquake in North China, the same feature of geo-electricity and deformation precursors before Zhangbei earthquake has also been found. It seems that the existence of the quadrant behavior is not accidental, which might be related to existence of the earthquake generations. It is known in terms of rock experiment and theoretical analysis that there exists actually quadrant feature in earthquake-generating process with the range of quadrant spatial distribution unfixed, showing features of ″gradual increasing → maximum → lessening slightly″, and showing that the increasing zone and the decreasing one (or compressing zone and expanding one) of the quadrant in the near-source region could be different from that in the region for from the source. Based on the knowledge of quadrant characteristics of earthquake precursors and analyzing the spatial distribution of different precursory anomaly types, which may be possess some reference meaning to the earthquake occurring region.
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Publication Date：2001-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 54-60 )