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≥2.0 earthquakes occurred in the eastern Capital Circle during January 2011 to May 2012 with seismic waveform data recorded by the Capital Circle Digital Telemetry Seismic Net- work. We analyzed temporal and spatial variation characteristics of dynamic parameters before the 2012 Tangshan Ms4.8 earthquake, 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 Ms4.8 earthquake; (2) High value area of apparent stress in the eastern Capital Circle is relevant to the earthquake source region before the 2012 Tangshan Ms4.8 earthquake.
出处
《地震》
CSCD
北大核心
2015年第2期91-100,共10页
Earthquake
基金
2014年震情跟踪合同制定向工作任务(2014020124)
地震科技星火计划(XH12001)资助
关键词
视应力时空变化
唐山Ms4.8地震
首都圈东部
Temporal and spatial variation of apparent stress
The 2012 Tangshan Ms4.8earthquake
The Eastern Capital Circle