川滇地区地壳应变场的GPS与地震矩张量联合反演研究
|
摘要
利用川滇地区1903~2003年间的84个地震矩张量和1998~2004年间214个GPS站速度观测值,采用方差分量估计方法确定联合反演中地震矩张量与GPS站速度值之间的权比例因子,计算分析了川滇地区的地壳应变场。结果表明:①采用方差分量估计确定联合反演中权比例因子的方法,得到的GPS站速度观测值的权比例因子为0.833,较地震矩张量的权比例因子0.167大,充分体现出分布相对合理的高精度GPS观测值在反演中的重要性;②川滇地区的应变场大致表现出如下的特征:主应变方向在30°N以北的区域为东西向;30°N以南、100°E以西的区域为北东向;30°N以南、100°E以东的区域为北西向。
By using 84 seismic moment tensors,collected from the Harvard centroid moment tensor between 1903 and 2003,and 214 GPS velocity observations,collected from the crustal motion observation network of China between 1998 and 2004,we fix the weight scaling factor of these two kinds of data in the joint inversion through Helmert method of variance components estimation(VCE),and invert for current crustal motion in Sichuan-Yunnan area.Meanwhile,on the basis of the analysis of inverted results,the following views are concluded.① By using VCE,the weight scaling factor of GPS observations with a value of 0.833 is higher than that of seismic data,with a value of 0.167.It shows the importance of GPS observations with high accuracy and relatively uniform distribution in joint inversion.② The crustal strain field in Sichuan-Yunnan area shows that the direction of compression strain is EW in the areas above 30°N and below 30°N,NE in the west of 100°E,and NW in the east of 100°E,which is accordance with other studies.
By using 84 seismic moment tensors,collected from the Harvard centroid moment tensor between 1903 and 2003,and 214 GPS velocity observations,collected from the crustal motion observation network of China between 1998 and 2004,we fix the weight scaling factor of these two kinds of data in the joint inversion through Helmert method of variance components estimation(VCE),and invert for current crustal motion in Sichuan-Yunnan area.Meanwhile,on the basis of the analysis of inverted results,the following views are concluded.① By using VCE,the weight scaling factor of GPS observations with a value of 0.833 is higher than that of seismic data,with a value of 0.167.It shows the importance of GPS observations with high accuracy and relatively uniform distribution in joint inversion.② The crustal strain field in Sichuan-Yunnan area shows that the direction of compression strain is EW in the areas above 30°N and below 30°N,NE in the west of 100°E,and NW in the east of 100°E,which is accordance with other studies.
引文
[1]苏有锦,秦嘉政.川滇地区强震活动与区域新构造活动的关系[J].中国地震,2001,17(1):24-34
[2]阚荣举,张四昌,宴风桐.我国西南地区现代构造应力场与现代构造活动特征的探讨[J].地球物理学报,1977,20(2):96-107
[3]陈智梁,张选阳,沈凤,等.中国西南地区地壳运动的GPS监测[J].科学通报,1999,44(8):851-854
[4]王琪,张培震,牛之俊,等.中国大陆现今地壳运动和构造变形[J].中国科学(D辑),2001,31(7):529-536
[5]独知行,刘经南.利用GPS位移和主应力方向观测资料进行川滇地区边界力的联合反演研究[J].武汉大学学报.信息科学版,2003,28(2):162-166
[6]乔学军,王琪,杜瑞林.川滇地区活动地块现今形变特征[J].地球物理学报,2004,47(5):805-811
[7]Holt W E,Haines A J.Velocity Fields in Deforma-tion Asia from the Inversion of Earthquake-releasedStrains[J].Tectonics,1993,12(1):1-20
[8]Holt W E,Chamot-Rooke N,Le Pichon X,et al.Velocity field in Asia inferred from Quaternary faultSlip Rates and Global Positioning System observa-tions[J].JGR,2000,105(B8):19 185-19 209
[9]Xu Caijun,Ding Kaihua,Wang Hua.Research onStochastic Modeling in the Joint Inversion of Space-geodetic Data and Seismic Moment tensor for De-formation Field in Chinese Continent[C].DynamicPlanet 2005,Cairns,Australia,2005
[10]钟锴,徐鸣洁,王良书,等.利用航磁、重力资料研究川滇地区大陆变形特征[J].地球科学进展,2005,20(10):1 089-1 094
[11]陈化然,陈连旺,马宏生,等.川滇地区应力场演化与强震间相互作用的三维有限元模拟[J].地震学报,2004,26(6):567-575
[2]阚荣举,张四昌,宴风桐.我国西南地区现代构造应力场与现代构造活动特征的探讨[J].地球物理学报,1977,20(2):96-107
[3]陈智梁,张选阳,沈凤,等.中国西南地区地壳运动的GPS监测[J].科学通报,1999,44(8):851-854
[4]王琪,张培震,牛之俊,等.中国大陆现今地壳运动和构造变形[J].中国科学(D辑),2001,31(7):529-536
[5]独知行,刘经南.利用GPS位移和主应力方向观测资料进行川滇地区边界力的联合反演研究[J].武汉大学学报.信息科学版,2003,28(2):162-166
[6]乔学军,王琪,杜瑞林.川滇地区活动地块现今形变特征[J].地球物理学报,2004,47(5):805-811
[7]Holt W E,Haines A J.Velocity Fields in Deforma-tion Asia from the Inversion of Earthquake-releasedStrains[J].Tectonics,1993,12(1):1-20
[8]Holt W E,Chamot-Rooke N,Le Pichon X,et al.Velocity field in Asia inferred from Quaternary faultSlip Rates and Global Positioning System observa-tions[J].JGR,2000,105(B8):19 185-19 209
[9]Xu Caijun,Ding Kaihua,Wang Hua.Research onStochastic Modeling in the Joint Inversion of Space-geodetic Data and Seismic Moment tensor for De-formation Field in Chinese Continent[C].DynamicPlanet 2005,Cairns,Australia,2005
[10]钟锴,徐鸣洁,王良书,等.利用航磁、重力资料研究川滇地区大陆变形特征[J].地球科学进展,2005,20(10):1 089-1 094
[11]陈化然,陈连旺,马宏生,等.川滇地区应力场演化与强震间相互作用的三维有限元模拟[J].地震学报,2004,26(6):567-575
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心