唐山强余震前地震活动的某些特征
SOME CHARACTERISTICS OF SEISMICITY BEFORE TANGSHAN STRONG AFTER SHOCKS
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摘要: 本文从观测事实出发,给出了四次唐山强余震前地震活动变化的某些特征。结果表明,强余震前,唐山地震序列的频度,地震波能量,b值及震中分布图象都发生了显著变化。通过讨论认为,这些变化是由于强余震发震断层形成闭锁段引起的,因此与强余震的孕育有着密切联系,可作为前兆信息。Abstract: Based on the seismological observations, this paper presents some characteristies of seismicity variation before 4 Tangshan trong after shocks.Tbe result shows that the freq-uency of Tangshan earthquake sequence, seismic wave energy,b-value and epicentrl distrib-ution pattern abviously changed before the strong after shocks.After discussion, it has been considered that these variations were caused by elosed section formed by strong after shock a ults, tbey were related with atrong after shock preparation, and so they can be used as precusory information.
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