杜迎春. 1998年张北地震及其较大余震的应力降[J]. 华北地震科学, 2000, 18(2): 66-69.
引用本文: 杜迎春. 1998年张北地震及其较大余震的应力降[J]. 华北地震科学, 2000, 18(2): 66-69.
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Du Yingchun. STRESS DROP OF ZHANGBEI EARTHQUAKE AND ITS LARGER AFTER SHOCK IN 1998[J]. North China Earthquake Sciences, 2000, 18(2): 66-69.
Citation: Du Yingchun. STRESS DROP OF ZHANGBEI EARTHQUAKE AND ITS LARGER AFTER SHOCK IN 1998[J]. North China Earthquake Sciences, 2000, 18(2): 66-69.
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1998年张北地震及其较大余震的应力降

STRESS DROP OF ZHANGBEI EARTHQUAKE AND ITS LARGER AFTER SHOCK IN 1998

    摘要
  • 摘要: 采用地震波初动半周期估算应力降的方法,计算了张北震区25次较大地震的应力降并对余震的应力降进行了分析,2月23日震区内发生的ML3.5级地震,其应力降高达2 6.2×105Pa,为3月11日5.6级地震的震前异常。

     

    Abstract: Using the method to estimate stress drop with the semiperiod of seismic wave's first motion,we calculated the stress drop of 25 larger earthquakes in Zhangbei earthquake area,and analyzed the stress drop of after shocks.The stress drop of the M L3.5 earthquake occurred on February 23 was high to 26.2×105 Pa.This anomaly can be regarded as the precursor of March 11's Ms5.6 earthquake.

     

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