有流体参与作用下的震源参数特征——以广西凌云凤山震群、龙滩库区地震为例
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摘要
对广西暴雨诱发的地震、水库地震及天然地震的地震波数字频谱参数特征进行分析;计算凌云凤山震群、2007—2013年广西桂东南地区天然地震及龙滩库区ML≥2.5级地震波形资料,获得凌云凤山震群、桂东南天然地震、龙滩库区地震震源参数。研究表明:凌云凤山震群和龙滩库区地震的应力降、震源尺度和拐角频率在数值范围、平均值都基本相同;它们的应力降和拐角频率明显小于桂东南地区地震,其中应力降约小1个量级;而它们的震源尺度明显大于同震级的桂东南地区地震。这些特征显示出数字地震波频谱分析也可较好地反映凌云凤山震群由暴雨诱发所致的成因。
In this article,digital seismic source spectrums of Guangxi earthquakes are analyzed,which include that induced by storm or reservoir and the natural occurrence.By calculating Lingyun-Fengshan earthquake swarm,the earthquakes(ML≥2.5)being adjacent to Longtan reservoir and the natural earthquake in southeastern Guangxi in 2007 to 2013,their parameters of seismic source are acquired respectively.The results indicate that for Lingyun-Fengshan and Longtan reservoir earthquakes,their stress drop,source radius and corner frequency are nearly the same at the range of values and the average.Their stress drop and the corner frequency are significantly less than these earthquakes in southeast of Guangxi.And their stress drops are smaller about 1order of magnitude.However,the source radiuses are significantly greater than that of the same seismic magnitude in southeast of Guangxi.The above of characteristics show that spectrum analysis of digital seismic wave can also reflect the storm-induced cause of Lingyun Fengshan earthquake swarm.
引文
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