青海北部中小地震视应力特征研究

使用青海省数字地震台网记录的中小地震波形资料,基于Brune模型计算得到2010年1月至2020年5月青海北部地区ML≥3.0的视应力等震源动力学参数.研究视应力时空变化特征,结合青海北部发生的5级地震探讨视应力异常与中强地震的关系并进行预测效能检验,结果显示:大部分5级地震前出现过视应力高值异常,分析认为青海北部显著...

Apparent stress characteristics of small and mediumearthquakes in northern Qinghai Province

In this paper,based on the Brune model,the apparent stress and other focal source parameters of M_L≥3.0 earthquakes in northern Qinghai Province from January 2010 to May 2020 were calculated by using the waveform data recorded by Qinghai digital seismic network.The spatial-temporal variation characteristics of apparent stress were studied.The relationship between apparent stress anomalies and moderate strong earthquakes was discussed based on M≥5.0 earthquakes occurred in northern Qinghai Province,and the prediction efficiency was tested.The results showed that high value of apparent stress occurred prior to most of M≥5.0 earthquakes,indicating that obvious anomaly of high apparent stress in northern Qinghai Province has certain indication significance for moderate strong earthquakes.