浙江地区水库地震与构造地震应力参数特征研究
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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。
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.
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.
引文
①浙江省地震局皎口地震跟踪预报研究组.鄞县皎口地震趋势跟踪预测研究报告.1997.
[1]刘红桂,王培玲,杨彩霞,等.地震视应力在地震预测中的应用[J].地震学报,2007,29(4):437-445.
[2]朱新运,于俊谊.基于MATLAB的小震震源参数计算软件研制[J].西北地震学报,2008,30(6):380～384.
[3]中国地震局监测预报司.地震参数-数字地震学在地震预测中的应用[M].北京:地震出版社,2003.
[4]刘红桂,刘杰,丁页岭,等.地震视应力在云南地震序列中的前兆特征[J].地震学报,2006,28(5):462-47l.
[5]朱新运,刘杰,张帆,等,基于Aki模型的近震S波尾波Q值求解及分析软件研制[J].地震研究,2006,29(3):76～80.
[6]朱新运,陈运泰,用Lg波资料反演场地效应与地震波衰减参数[J].地震学报,2007,29(6),569～580.
[7]陈章立.浅论地震预报地震学方法基础[M].北京:地震出版社,2004.
[1]刘红桂,王培玲,杨彩霞,等.地震视应力在地震预测中的应用[J].地震学报,2007,29(4):437-445.
[2]朱新运,于俊谊.基于MATLAB的小震震源参数计算软件研制[J].西北地震学报,2008,30(6):380～384.
[3]中国地震局监测预报司.地震参数-数字地震学在地震预测中的应用[M].北京:地震出版社,2003.
[4]刘红桂,刘杰,丁页岭,等.地震视应力在云南地震序列中的前兆特征[J].地震学报,2006,28(5):462-47l.
[5]朱新运,刘杰,张帆,等,基于Aki模型的近震S波尾波Q值求解及分析软件研制[J].地震研究,2006,29(3):76～80.
[6]朱新运,陈运泰,用Lg波资料反演场地效应与地震波衰减参数[J].地震学报,2007,29(6),569～580.
[7]陈章立.浅论地震预报地震学方法基础[M].北京:地震出版社,2004.
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