利用单台波形资料计算大柴旦6.3级地震余震震源机制
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摘要
以2008年11月10日大柴旦Ms6.3级地震余震数字地震波观测资料为基础,运用矩张量反演方法,利用单台三分量波形资料计算余震的震源机制。收集整理大柴旦Ms6.3级地震公认的震源参数结果和青海区域地震台网数字地震波资料,以大柴旦Ms6.3级地震的震源参数作为约束,计算理论地震波来确定该区域的地壳速度模型。以此模型计算ML≥2.0级余震震源机制解。共收集160个余震资料,最后确定了85个余震震源机制解,其中最大震级为ML4.7,最小震级为ML2.0。进行单台与多台联合矩张量反演结果对比,两种方法所确定的结果相差不大。实际计算表明,在观测资料信噪比较高的情况下,运用单台数字地震波观测资料可以较好地确定中小地震的震源机制。
Based on the digital seismic data of the aftershocks of Dachaidan Ms6.3 earthquake in Nov.10,2008,using the three-component seismic data from a single-station,we calculate the focal mechanisms of aftershocks by the method of the moment tensors inversion.We collect the epicenter parameters published of Dachaidan Ms6.3 earthquake in Nov.10,2008 and the digital seismic data of the seismic network in Qinghai region.Through calculated theoretical seismic wave,we can get the velocity structure model of the research area in this paper by the epicenter parameters of Dachaidan Ms6.3 earthquake.Using this model,we obtain the focal mechanisms of the ML≥2.0 aftershocks.We chosed the 160 aftershocks from the digital seismic data and got some results of 85 aftershocks at last,among which,the largest event is ML 4.7,the smallest magnitude is ML 2.0.Through contrast analysis,it almost is similar that we obtain the moment tensor inversion results from a single-station and the five stations.The calculated results show that the focal mechanisms of a small to moderate earthquakes can be gotten using the digital seismic data from a single-station.
Based on the digital seismic data of the aftershocks of Dachaidan Ms6.3 earthquake in Nov.10,2008,using the three-component seismic data from a single-station,we calculate the focal mechanisms of aftershocks by the method of the moment tensors inversion.We collect the epicenter parameters published of Dachaidan Ms6.3 earthquake in Nov.10,2008 and the digital seismic data of the seismic network in Qinghai region.Through calculated theoretical seismic wave,we can get the velocity structure model of the research area in this paper by the epicenter parameters of Dachaidan Ms6.3 earthquake.Using this model,we obtain the focal mechanisms of the ML≥2.0 aftershocks.We chosed the 160 aftershocks from the digital seismic data and got some results of 85 aftershocks at last,among which,the largest event is ML 4.7,the smallest magnitude is ML 2.0.Through contrast analysis,it almost is similar that we obtain the moment tensor inversion results from a single-station and the five stations.The calculated results show that the focal mechanisms of a small to moderate earthquakes can be gotten using the digital seismic data from a single-station.
引文
[1]陈运泰,吴忠良,王培德,等.数字地震学[M].北京:地震出版社,2000:94-125.
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[4]胡幸平,俞春泉,陶开,等.利用P波初动资料求解汶川地震及其强余震震源机制解[J].地球物理学报,2008,51(6):1 711-1 718.
[5]张晓清,顾永康.昆仑山口西8.1级地震前青海省形变及地温前兆特征分析[J].高原地震,2003,13(1):70-75.
[6]江枚,许志琴,钱荣毅,等.从德令哈地震分析青藏高原北缘东段的深部构造活动[J].中国地质,2006,33(2):268-274.
[7]刘超,张勇,许力生,等.一种矩张量反演新方法及其对2008年汶川Ms8.0地震序列的应用[J].地震学报,2008,30(4):329-339.
[8]Xu Z H,Yan M,Zhao Z H.Evaluation of the directionof tectonic stress in north China from recorded data of alarge number of small earthquakes[J].Acta Seismolo-gica Sinica(in Chinese),1983,5(3):268-279.
[9]Xu Z H,Wang S Y,Huang Y R,et al.The tectonicstress field of Chinese continent deduced from a greatnumber of earthquakes[J].Chinese J.Geophys.(inChinese),1989,32(6):636-647.
[10]周云好.用远场体波反演震源破裂过程研究[D].北京:中国地震局地震预测研究所,2002:20-25.
[11]张希,江在森.青藏高原北部地区构造变形特征及与强震关系[J].地球物理学进展,2004,19(2):363-371.
[12]青海省地震局.2008年11月10日大柴旦地震灾害损失评估报告[R].西宁:青海省地震局,2008:1-26.
[2]Aki.K.and Richards.P.G.定量地震学[M].北京:地震出版社,1980:30-56.
[3]倪江川,陈运泰,王鸣,等.云南禄劝地震部分余震的矩张量反演[J].地震学报,1991,13(4):412-419.
[4]胡幸平,俞春泉,陶开,等.利用P波初动资料求解汶川地震及其强余震震源机制解[J].地球物理学报,2008,51(6):1 711-1 718.
[5]张晓清,顾永康.昆仑山口西8.1级地震前青海省形变及地温前兆特征分析[J].高原地震,2003,13(1):70-75.
[6]江枚,许志琴,钱荣毅,等.从德令哈地震分析青藏高原北缘东段的深部构造活动[J].中国地质,2006,33(2):268-274.
[7]刘超,张勇,许力生,等.一种矩张量反演新方法及其对2008年汶川Ms8.0地震序列的应用[J].地震学报,2008,30(4):329-339.
[8]Xu Z H,Yan M,Zhao Z H.Evaluation of the directionof tectonic stress in north China from recorded data of alarge number of small earthquakes[J].Acta Seismolo-gica Sinica(in Chinese),1983,5(3):268-279.
[9]Xu Z H,Wang S Y,Huang Y R,et al.The tectonicstress field of Chinese continent deduced from a greatnumber of earthquakes[J].Chinese J.Geophys.(inChinese),1989,32(6):636-647.
[10]周云好.用远场体波反演震源破裂过程研究[D].北京:中国地震局地震预测研究所,2002:20-25.
[11]张希,江在森.青藏高原北部地区构造变形特征及与强震关系[J].地球物理学进展,2004,19(2):363-371.
[12]青海省地震局.2008年11月10日大柴旦地震灾害损失评估报告[R].西宁:青海省地震局,2008:1-26.
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