【摘要】 利用浙江区域数字地震台网记录到的地震波数据,采用布龙模式下近震源记录计算震源谱参数的方法,系统测定了发生在温州珊溪水库、宁波皎口水库库区以及浙江地区构造地震共326次地震的应力降、视应力等参数。给出了两个水库区地震与构造地震的应力降与视应力参数特征,并进行了对比分析。初步研究发现,皎口地震的应力降和视应力值均低于浙江地区构造地震;珊溪水库地震与构造地震在应力降和视应力值上具有震级分段的特征:震级ML<4.0级的地震,同震级的应力降和视应力值两者相差不大,而震级ML>4.0级的地震,构造地震的应力降和视应力值均高于珊溪水库地震。此外,测定的应力降、视应力的对数与震级ML之间存在较好的线性关系。更多还原

【Abstract】 Using the digital seismic wave data recorded by the station network in Zhejiang province and calculating source spectrum parameters with local quake records under Brune model,the system measures the stress drop and apparent stress values of 326 earthquakes that happened in Shanxi reservoir,Jiaokou reservoir and Zhejiang province.Provided with characteristics of stress drop and apparent stress parameters,this paper has conducted a comparative analysis,preliminary findings show that values of stress drop and apparent stress of Jiaokou earthquakes are less than that of tectonic earthquakes in Zhejiang.The stress drop and apparent stress of Shanxi reservoir earthquake and tectonic earthquakes are characterized by earthquake magnitude segmentation: for earthquakes of same magnitude with M<4,the two types of earthquakes shows little difference in values of stress drop and apparent stress;for earthquakes with M>4,the stress drop and apparent stress of tectonic earthquakes are higher than that of Shanxi reservoir earthquakes.In addition,we found that the logarithm of stress drop and apparent stress poses good linear relationship with the magnitude ML.更多还原