地震的震源机制解的计算和分析
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摘要
本文根据大柴旦周围40余个地震监测台站记录到的P波初动及部分S波初动等信息计算了2008年以来大柴旦50余次M3.5级以上的地震,其中合理的得出了46个震源机制解,通过与哈佛给出的结果分析了两次6级地震震源机制解的可靠性,同时讨论了中小震的震源机制解特性,并对区域的应力场进行了估算,得到了较为合理的结果,为该区域的地震研究提供一定参考.
In this paper,according about 40 seismic monitoring stations' recorded around Dachaidan of Qinghai provice,Use P wave first motion and part of S wave first motion information to calculate the focal mechanism solution.Collected 50 times M≥3.5 since 2008 of Dachaidan region,but only get 46 reasonably focal mechanism solutions,compared with Harvard's solution by two M≥6,the results that our focal mechanism solutions is reliability.So use the mechanism solutions of we have calculated to discuss the characteristics,and estimate the region stress field,and got a series of reasonable results,provide meaningful reference to study the region.
In this paper,according about 40 seismic monitoring stations' recorded around Dachaidan of Qinghai provice,Use P wave first motion and part of S wave first motion information to calculate the focal mechanism solution.Collected 50 times M≥3.5 since 2008 of Dachaidan region,but only get 46 reasonably focal mechanism solutions,compared with Harvard's solution by two M≥6,the results that our focal mechanism solutions is reliability.So use the mechanism solutions of we have calculated to discuss the characteristics,and estimate the region stress field,and got a series of reasonable results,provide meaningful reference to study the region.
引文
[1]屠泓为,杨丽萍,万秀红.青海省及邻近区域未来强震趋势分析.防灾科技学院学报,2009,11(4):141-147.Tu H W,Yang L P,Wan X H.Analysis on future trends ofstrong earthquakes in Qinghai province and its neighboringregion.Journal of Institute of Disaster-Prevention Science andTechnology(in Chinese),2009,11(4):141-147.
[2]屠泓为,张小香,万秀红等.中国大陆西部未来强震危险性预测研究.高原地震,2008,20(2):4-13.Tu H W,Zhang X X,Wan X H,et al.Discussion on the riskof strong earthquakes in the future in west of Chinesemainland.Plateau Earthquake Research(in Chinese),2008,20(2):4-13.
[3]屠泓为,王海涛,罗国富等.青藏高原及邻近区域的大震危险性分析和探讨.灾害学,2007,22(4):29-33.Tu H W,Wang H T,Luo G F,et al.Analysis and discussionon larger earthquake risk in Qingzang plateau and itscircumjacent region.Journal of Catastrophology(in Chinese),2007,22(4):29-33.
[4]屠泓为,都昌庭,万秀红等.周边大地震对中国大陆7级以上地震的指示作用及统计分析.地球物理学进展,2011,26(3):829-835.Tu H W,Du C T,Wan X H,et al.Statistical and analysisthe instruction of surrounding large earthquake to Chinamainland Ms≥7.0.Progress in Geophysics(in Chinese),2011,26(3):829-835.
[5]李智敏,屠泓为,田勤俭等.2008年青海大柴旦6.3级地震及发震背景研究.地球物理学进展,2010,25(3):768-774.Li Z M,Tu H W,Tian Q J,et al.The 2008 Ms6.3earthquake in the Dacaidan region,Qinghai province and itsseismotectonic setting.Progress in Geophysics(in Chinese),2010,25(3):768-774.
[6]屠泓为,都昌庭,马震等.利用P波初动计算青海中强地震的震源机制解.高原地震,2008,20(1):22-26.Tu H W,Du C T,Ma Z,et al.The focal mechanismsolutions of middle-strong earthquake in Qinghai calculated bythe first motion of P wave.Plateau Earthquake Research(inChinese),2008,20(1):22-26.
[7]屠泓为,王海涛,赵翠萍.用P波、S波初动和振幅比计算新疆伽师两次强地震震源机制解.内陆地震,2006,20(2):131-138.Tu H W,Wang H T,Zhao C P.Calculating focal mechanismsolutions of two Jiashi strong earthquakes in Xinjiang with thefirst motion and amplitude ratio of P Wave and S Wave.InlandEarthquake(in Chinese),2006,20(2):131-138.
[8]刘杰,郑斯华,康英等.利用P波和S波的初动和振幅比计算中小地震的震源机制解.地震,2004,24(1):19-26.Liu J,Zheng S H,Kang Y,et al.The focal mechanismdeterminations of moderate-small earthquakes using the firstmotion and amplitude ratio of P and S wave.Earthquake(inChinese),2004,24(1):19-26.
[9]胡新亮,刁桂苓,马瑾等.利用数字地震记录的P、S振幅比资料测定小震震源机制解的可靠性分析.地震地质,2004,26(2):347-354.Hu X L,Diao G L,Ma J,et al.Reliability analysis of focalmechanism solutions of micro-earthquakes determined fromamplitude ratio of P and S recorded by digital seismograph.Seismology and Geology(in Chinese),2004,26(2):347-354.
[10]于海英,朱元清,郭育.使用SV/P,SH/P和SV/SH振幅比确定震源机制解.地震研究,2003,26(4):355-360.Yu H Y,Zhu Y Q,Guo Y.Determining focal mechanicsolution by using the proportion of the amplitude of SV/P,SH/P and SV/SH.Journal of Seismological Research(inChinese),2003,26(4):355-360.
[11]刘峰,牟中海,蒋裕强等.小断层的地震识别.地球物理学进展,2011,26(6):2210-2215.Liu F,Mu Z H,Jiang Y Q,et al.Seismic identification ofsmall fault.Progress in Geophysics(in Chinese),2011,26(6):2210-2215.
[12]闻学泽,杜方,张培震等.巴颜喀拉块体北和东边界大地震序列的关联性与2008年汶川地震.地球物理学报,2011,54(3):706-716.Wen X Z,Du F,Zhang P Z,et al.Correlation of majorearthquake sequences on the northern and eastern boundariesof the Bayan Har block,and its relation to the 2008Wenchuan earthquake.Chinese J.Geophys.(in Chinese),2011,54(3):706-716.
[13]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.地球物理学报,2008,51(6):1711-1718.Hu X P,Yu C Q,Tao K,et al.Focal mechanism solutionsof Wenchuan earthquake and its strong aftershocks obtainedfrom initial P wave polarity analysis.Chinese J.Geophys.(in Chinese),2008,51(6):1711-1718.
[14]吕坚,郑勇,马玉虎等.2010年4月14日青海玉树Ms4.7、Ms7.1、Ms6.3地震震源机制解与发震构造研究.地球物理学进展,2011,26(5):1600-1606.LüJ,Zheng Y,Ma Y H,et al.Focal mechanisms andseismogenic structures of the MS4.7、MS7.1and MS6.3Yushu earthquakes of April.14,2010.Progress inGeophysics(in Chinese),2011,26(5):1600-1606.
[15]石耀霖,朱守彪.中国大陆震源机制深度变化反映的地壳-地幔流变特征.地球物理学报,2003,46(3):359-365Shi Y L,Zhu S B.Contrast of rheology in the crust andmantle near Moho revealed by depth variation of earthquakemechanism in continental China.Chinese J.Geophys.(inChinese),2003,46(3):359-365
[16]万永革,吴逸民,盛书中等.P波极性数据所揭示的台湾地区三维应力结构的初步结果.地球物理学报,2011,54(11):2809-2818.Wan Y G,Wu Y M,Sheng S Z,et al.Preliminary result ofTaiwan 3-D stress field from P wave polarity data.Chinese J.Geophys.(in Chinese),2011,54(11):2809-2818.
[17]赵翠萍,陈章立,郑斯华.1998-2003年伽师三次不同类型Ms6级地震震源破裂过程及短期内余震活动特征.地球物理学报,2008,51(4):1093-1102.Zhao C P,Chen Z L,Zheng S H.Source rupture process of 3Jiashi Ms6events(1998-2003)and its correlation with theaftershock activity.Chinese J.Geophys.(in Chinese),2008,V51(4):1093-1102.
[18]徐纪人,赵志新,石川有三.中国大陆地壳应力场与构造运动区域特征研究.地球物理学报,2008,51(3):770-781.Xu J R,Zhao Z X,Ishikawa Y.Regional characteristics ofcrustal stress field and tectonic motions in and around Chinesemainland.Chinese J Geophys.(in Chinese),2008,V51(3):770-781.
[19]刁桂苓,王晓山,高国英等.以震源机制类型划分汶川、玉树地震构造块体归属.地球物理学报,2010,53(8):1778-1783.Diao G L,Wang X S,Gao G Y,et al.Tectonic blockattribution of Wenchuan and Yushu earthquakes distinguishedby focal mechanism type.Chinese J.Geophys.(in Chinese),2010,53(8):1778-1783.
[20]艾印双,郑天愉.青藏高原地震活动及其构造背景.地球物理学进展,1997,12(2):30-40.Ai Y S,Zheng T Y.Seismic activity in Tibetan plateau andits tectonic implication.Progress in Geophysics(in Chinese),1997,12(2):30-40.
[21]段永红,赖晓玲,李松林等.新疆伽师地震的近场观测和对它的初步认识.地球物理学进展,1999,14(4):41-48.Duan Y H,Lai X L,Li S L,et al.Near field earthquakeobservation of Jiashi and some deductions of Jiashi strongearthquakes.Progress in Geophysics(in Chinese),1999,14(4):41-48.
[22]王辉,张国民,汪素云等.应用地震学方法研究中国大陆活动地块应力应变场.地球物理学报,2004,47(6)1035-1043.Wang H,Zhang G M,Wang S Y,et al.Stress and strainfields of active tectonic blocks in the China mainland deducedby seismological methods.Chinese J.Geophys.(inChinese),2004,47(6):1035-1043.
[23]魏柏林.余震震源机制变化的原因.地球物理学报,1980,23(1):25-34.Wei B L.Cause of the change of focal mechanisms ofaftershocks.Chinese J.Geophys.(in Chinese),1980,23(1):25-34
[24]陈培善,严寿民.震源机制与烈度分布的关系.地球物理学报,1975,18(1):11-25.Chen P S,Yan S M.Relation between the seismic sourcemechanism and the intensity distribution.Chinese J.Geophys.(in Chinese),1975,18(1):11-25
[25]傅承义.喜马拉雅山区域的地震.地球物理学报,1958,7(1):41-42.Fu C Y.Earthquakes in the himalayan region.Chinese J.Geophys.(in Chinese),1958,7(1):41-42.
[2]屠泓为,张小香,万秀红等.中国大陆西部未来强震危险性预测研究.高原地震,2008,20(2):4-13.Tu H W,Zhang X X,Wan X H,et al.Discussion on the riskof strong earthquakes in the future in west of Chinesemainland.Plateau Earthquake Research(in Chinese),2008,20(2):4-13.
[3]屠泓为,王海涛,罗国富等.青藏高原及邻近区域的大震危险性分析和探讨.灾害学,2007,22(4):29-33.Tu H W,Wang H T,Luo G F,et al.Analysis and discussionon larger earthquake risk in Qingzang plateau and itscircumjacent region.Journal of Catastrophology(in Chinese),2007,22(4):29-33.
[4]屠泓为,都昌庭,万秀红等.周边大地震对中国大陆7级以上地震的指示作用及统计分析.地球物理学进展,2011,26(3):829-835.Tu H W,Du C T,Wan X H,et al.Statistical and analysisthe instruction of surrounding large earthquake to Chinamainland Ms≥7.0.Progress in Geophysics(in Chinese),2011,26(3):829-835.
[5]李智敏,屠泓为,田勤俭等.2008年青海大柴旦6.3级地震及发震背景研究.地球物理学进展,2010,25(3):768-774.Li Z M,Tu H W,Tian Q J,et al.The 2008 Ms6.3earthquake in the Dacaidan region,Qinghai province and itsseismotectonic setting.Progress in Geophysics(in Chinese),2010,25(3):768-774.
[6]屠泓为,都昌庭,马震等.利用P波初动计算青海中强地震的震源机制解.高原地震,2008,20(1):22-26.Tu H W,Du C T,Ma Z,et al.The focal mechanismsolutions of middle-strong earthquake in Qinghai calculated bythe first motion of P wave.Plateau Earthquake Research(inChinese),2008,20(1):22-26.
[7]屠泓为,王海涛,赵翠萍.用P波、S波初动和振幅比计算新疆伽师两次强地震震源机制解.内陆地震,2006,20(2):131-138.Tu H W,Wang H T,Zhao C P.Calculating focal mechanismsolutions of two Jiashi strong earthquakes in Xinjiang with thefirst motion and amplitude ratio of P Wave and S Wave.InlandEarthquake(in Chinese),2006,20(2):131-138.
[8]刘杰,郑斯华,康英等.利用P波和S波的初动和振幅比计算中小地震的震源机制解.地震,2004,24(1):19-26.Liu J,Zheng S H,Kang Y,et al.The focal mechanismdeterminations of moderate-small earthquakes using the firstmotion and amplitude ratio of P and S wave.Earthquake(inChinese),2004,24(1):19-26.
[9]胡新亮,刁桂苓,马瑾等.利用数字地震记录的P、S振幅比资料测定小震震源机制解的可靠性分析.地震地质,2004,26(2):347-354.Hu X L,Diao G L,Ma J,et al.Reliability analysis of focalmechanism solutions of micro-earthquakes determined fromamplitude ratio of P and S recorded by digital seismograph.Seismology and Geology(in Chinese),2004,26(2):347-354.
[10]于海英,朱元清,郭育.使用SV/P,SH/P和SV/SH振幅比确定震源机制解.地震研究,2003,26(4):355-360.Yu H Y,Zhu Y Q,Guo Y.Determining focal mechanicsolution by using the proportion of the amplitude of SV/P,SH/P and SV/SH.Journal of Seismological Research(inChinese),2003,26(4):355-360.
[11]刘峰,牟中海,蒋裕强等.小断层的地震识别.地球物理学进展,2011,26(6):2210-2215.Liu F,Mu Z H,Jiang Y Q,et al.Seismic identification ofsmall fault.Progress in Geophysics(in Chinese),2011,26(6):2210-2215.
[12]闻学泽,杜方,张培震等.巴颜喀拉块体北和东边界大地震序列的关联性与2008年汶川地震.地球物理学报,2011,54(3):706-716.Wen X Z,Du F,Zhang P Z,et al.Correlation of majorearthquake sequences on the northern and eastern boundariesof the Bayan Har block,and its relation to the 2008Wenchuan earthquake.Chinese J.Geophys.(in Chinese),2011,54(3):706-716.
[13]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.地球物理学报,2008,51(6):1711-1718.Hu X P,Yu C Q,Tao K,et al.Focal mechanism solutionsof Wenchuan earthquake and its strong aftershocks obtainedfrom initial P wave polarity analysis.Chinese J.Geophys.(in Chinese),2008,51(6):1711-1718.
[14]吕坚,郑勇,马玉虎等.2010年4月14日青海玉树Ms4.7、Ms7.1、Ms6.3地震震源机制解与发震构造研究.地球物理学进展,2011,26(5):1600-1606.LüJ,Zheng Y,Ma Y H,et al.Focal mechanisms andseismogenic structures of the MS4.7、MS7.1and MS6.3Yushu earthquakes of April.14,2010.Progress inGeophysics(in Chinese),2011,26(5):1600-1606.
[15]石耀霖,朱守彪.中国大陆震源机制深度变化反映的地壳-地幔流变特征.地球物理学报,2003,46(3):359-365Shi Y L,Zhu S B.Contrast of rheology in the crust andmantle near Moho revealed by depth variation of earthquakemechanism in continental China.Chinese J.Geophys.(inChinese),2003,46(3):359-365
[16]万永革,吴逸民,盛书中等.P波极性数据所揭示的台湾地区三维应力结构的初步结果.地球物理学报,2011,54(11):2809-2818.Wan Y G,Wu Y M,Sheng S Z,et al.Preliminary result ofTaiwan 3-D stress field from P wave polarity data.Chinese J.Geophys.(in Chinese),2011,54(11):2809-2818.
[17]赵翠萍,陈章立,郑斯华.1998-2003年伽师三次不同类型Ms6级地震震源破裂过程及短期内余震活动特征.地球物理学报,2008,51(4):1093-1102.Zhao C P,Chen Z L,Zheng S H.Source rupture process of 3Jiashi Ms6events(1998-2003)and its correlation with theaftershock activity.Chinese J.Geophys.(in Chinese),2008,V51(4):1093-1102.
[18]徐纪人,赵志新,石川有三.中国大陆地壳应力场与构造运动区域特征研究.地球物理学报,2008,51(3):770-781.Xu J R,Zhao Z X,Ishikawa Y.Regional characteristics ofcrustal stress field and tectonic motions in and around Chinesemainland.Chinese J Geophys.(in Chinese),2008,V51(3):770-781.
[19]刁桂苓,王晓山,高国英等.以震源机制类型划分汶川、玉树地震构造块体归属.地球物理学报,2010,53(8):1778-1783.Diao G L,Wang X S,Gao G Y,et al.Tectonic blockattribution of Wenchuan and Yushu earthquakes distinguishedby focal mechanism type.Chinese J.Geophys.(in Chinese),2010,53(8):1778-1783.
[20]艾印双,郑天愉.青藏高原地震活动及其构造背景.地球物理学进展,1997,12(2):30-40.Ai Y S,Zheng T Y.Seismic activity in Tibetan plateau andits tectonic implication.Progress in Geophysics(in Chinese),1997,12(2):30-40.
[21]段永红,赖晓玲,李松林等.新疆伽师地震的近场观测和对它的初步认识.地球物理学进展,1999,14(4):41-48.Duan Y H,Lai X L,Li S L,et al.Near field earthquakeobservation of Jiashi and some deductions of Jiashi strongearthquakes.Progress in Geophysics(in Chinese),1999,14(4):41-48.
[22]王辉,张国民,汪素云等.应用地震学方法研究中国大陆活动地块应力应变场.地球物理学报,2004,47(6)1035-1043.Wang H,Zhang G M,Wang S Y,et al.Stress and strainfields of active tectonic blocks in the China mainland deducedby seismological methods.Chinese J.Geophys.(inChinese),2004,47(6):1035-1043.
[23]魏柏林.余震震源机制变化的原因.地球物理学报,1980,23(1):25-34.Wei B L.Cause of the change of focal mechanisms ofaftershocks.Chinese J.Geophys.(in Chinese),1980,23(1):25-34
[24]陈培善,严寿民.震源机制与烈度分布的关系.地球物理学报,1975,18(1):11-25.Chen P S,Yan S M.Relation between the seismic sourcemechanism and the intensity distribution.Chinese J.Geophys.(in Chinese),1975,18(1):11-25
[25]傅承义.喜马拉雅山区域的地震.地球物理学报,1958,7(1):41-42.Fu C Y.Earthquakes in the himalayan region.Chinese J.Geophys.(in Chinese),1958,7(1):41-42.
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