2012年河北唐山M_S4.8地震前首都圈东部视应力时空变化特征
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摘要
本文采用近震源Brune模式,采用国家数字测震台网数据备份中心提供的地震波形资料,测定了2011年1月至2012年5月期间首都圈东部85次ML≥2.0地震的视应力,分析了2012年4月28日河北唐山MS4.8地震前动力学参数的时空变化特征,并讨论了震源参数的标度关系。结果如下:1视应力时序变化显示,唐山MS4.8地震前首都圈东部视应力出现了明显的升高变化过程;2视应力空间分布显示,唐山MS4.8地震前,首都圈东部视应力在震源区出现了相对高值集中区。
Using the near-source Brune model,we determined apparent Stresses of 85 ML≥2.0earthquakes occurred in the eastern Capital Circle during January 2011 to May 2012 with seismic waveform data recorded by the Capital Circle Digital Telemetry Seismic Network.We analyzed temporal and spatial variation characteristics of dynamic parameters before the 2012 Tangshan MS4.8earthquake,and discussed the corresponding relationship with stress drop and source parameters.The results show that:(1)The apparent stresses have an obvious increase process before the 2012 Tangshan MS4.8earthquake;(2)High value area of apparent stress in the eastern Capital Circle is relevant to the earthquake source region before the 2012 Tangshan MS4.8earthquake.
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