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《Northwestern Seismological Journal》 1988-01
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PRE-DISPLACEMENT STOPPING PHASE AND SUDDEN TYPES OF PRECURSOR

Qin Baoyan, Wang Jin Liu Guangyuan (Seismological Institute of Lanzhou, State Seismological Bureau)  
This paper theoretically discussed two kinds of pre-displacement stopping phases. One occurs in part area of fault, we call it partial area predisplacement. Another occurs in the whole fault, we call it whole area pre-displacement. There are obvious differences of stopping conditions between thc two kinds of pre-displacements, which result in difference of pre-displcement stopping phases and difference of long-period wave as well as difference of sudden types of precursors induced by long-period wave. The preliminary results are as follows:(1) The pre-displacement before the most of large earthquakes is partial area pre-displacement, but that before the most of moderate earthquakeis whole area pre-displacement.(2) The source process of partial area pre-displacement is finite moving source and that of whole area pre-displacement is combination of finite moving source and instantaneous source. The former only produce one long-period P-wave, but the latter produced two long-period P-waves with different arriving time.(3) The long-period P-wave induced by partial area or whole area predisplace-ments is similar to their source time function. The former. produced single peak type of precursor, the latter produced double peak type of precursor. So the magnitude of future earthquake can be judged approximately by type of precursors.(4) Because extent of partial area pre-displacement region before large earthquake is approximate to extent of whole pre-displacement region before moderate earthquake, their pre-placement amplitudes is also approximate. Such results can explain the fact that the amplitudes of precursor is not related to magnitude of earthquake。
【Fund】: 地震科学联合基金~~
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