利用GPS研究红河断裂带的地壳形变及断层运动特征
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摘要
利用红河断裂带及其邻区的2009～2014年间144个GPS测站的三期观测数据,将红河断裂带分为北、中、南三段,计算并分析了该地区的水平速度场,并采用DEFNODE程序反演了红河断裂带的闭锁和滑移亏损分布特征。结果表明,红河断裂带呈现较为明显的分段特征,断裂带的水平运动速度由北向南、由东向西逐渐减小,且GPS水平速度场在跨越断层时呈现较为均匀的二次线性变化;断层位错模拟结果表明,红河断裂带北段的闭锁程度明显高于中部和南部,其北段在44km深度处闭锁系数为1.0,达到完全闭锁状态,相应的红河断裂带北段的滑移亏损量也明显高于中部和南部。上述结果表明,红河断裂带北部的应变积累能力较强,地震危险性较高。
The Red River fault zone are divided into three parts:the north,central and south part,based on the GPS survey data at 144 GPS sites during 2009-2014 in the Red River fault zone and its adjacent areas.The horizontal movement velocity field of the area is calculated and analysised,and the locking and slip deficit distribution characteristic of the Red River fault zone are inversed through DEFNODE.The results indicate that the Red River fault presents relatively obvious segmentation features,and the horizontal movement velocity of the fault zone are gradually decrease from the north to the south and from east to west,in addition,the GPS horizontal velocity field changes uniformly while crossing the fault;the inversion results of DEFNODE indicate that the locking rates in the north part of the Red River fault zone are obviously stronger than that in the central and south parts,and the locking coefficient of the north part in the 36 km below the earth's surface is 1.0,meaning that the fault in the north part reaches the completely locking states,then slip deficit amount is obviously greater than it in the central and south part accordingly.The results above indicate that the capacity of strain accumulation in the north part of the Red River fault is strong,and the seismic is high.
The Red River fault zone are divided into three parts:the north,central and south part,based on the GPS survey data at 144 GPS sites during 2009-2014 in the Red River fault zone and its adjacent areas.The horizontal movement velocity field of the area is calculated and analysised,and the locking and slip deficit distribution characteristic of the Red River fault zone are inversed through DEFNODE.The results indicate that the Red River fault presents relatively obvious segmentation features,and the horizontal movement velocity of the fault zone are gradually decrease from the north to the south and from east to west,in addition,the GPS horizontal velocity field changes uniformly while crossing the fault;the inversion results of DEFNODE indicate that the locking rates in the north part of the Red River fault zone are obviously stronger than that in the central and south parts,and the locking coefficient of the north part in the 36 km below the earth's surface is 1.0,meaning that the fault in the north part reaches the completely locking states,then slip deficit amount is obviously greater than it in the central and south part accordingly.The results above indicate that the capacity of strain accumulation in the north part of the Red River fault is strong,and the seismic is high.
引文
[1]向宏发,韩竹军,虢顺民,等.红河断裂带大型右旋走滑运动与伴生构造地貌变形[J].地震地质,2004,26(4):597-610
[2]张建国,皇甫岗,谢英情,等.中越红河断裂带考察与研究(一)[J].地震研究,2008,31(4):362-368
[3]朱俊江,詹文欢,唐诚,等.红河断裂带活动性研究[J].华南地震,2003,23(2):13-19
[4]虢顺民.红河活动断裂带[M].北京:海洋出版社,2001
[5]Wang H,Liu M,Cao J,et al.Slip Rates and Seismic Moment Deficits on Major Active Faults in Mainland China[J].Journal of Geophysical Research:Solid Earth,2011,116(B2),doi:10.1029/2010JB007821
[6]丁开华,许才军,邹蓉,等.利用GPS分析川滇地区活动地块运动与应变模型[J].武汉大学学报·信息科学版,2013,38(7):822-827
[7]王阎昭,王恩宁,沈正康,等.基于GPS资料约束反演川滇地区主要断裂现今活动速率[J].中国科学(地球科学),2008,38(5):582-597
[8]邓起东,卢造勋,杨主恩.城市活动断层探测和断层活动性评价问题[J].地震地质,2007,29(2):189-200
[9]邓起东,汪一鹏,廖玉华,等.断层崖崩积楔及贺兰山山前断裂全新世活动历史[J].科学通报,1984,29(9):557-557
[10]邓起东,张培震.史前古地震的逆断层崩积楔[J].科学通报,2000,45(6):650-655
[11]邓起东,高翔,杨虎.断块构造、活动断块构造与地震活动[J].地质科学,2009,44(4):1 083-1 093
[12]张希,郝明,贾鹏,等.全国主要构造区GPS水平运动负位错反演与应变积累特性[J].地震研究,2013,36(1):1-8
[13]申重阳,王琪,吴云,等.川滇菱形块体主要边界运动模型的GPS数据反演分析[J].地球物理学报,2002,45(3):352-361
[14]刘宝明,夏斌,李绪宣,等.红河断裂带东南的延伸及其构造演化意义[J].中国科学(地球科学),2006,36(10):914-924
[15]张清志,刘宇平,陈智梁,等.红河断裂带的GPS观测数据反演[J].地球物理学进展,2007,22(2):418-421
[16]李亚敏,徐辉龙,孙金龙,等.红河断裂带及其邻区的震源机制解特征及其反映的断裂活动分段性[J].热带海洋学报,2008,27(2):32-39
[17]赵国强,任雳.基于GAMIT/GLOBK的GPS数据处理平台搭建[J].测绘地理信息,2016,41(1):37-42
[18]王超,郭际明,周命端,等.高精度GPS数据处理中GAMIT批处理方法与实现[J].测绘地理信息,2012,37(2):10-12
[19]Pollitz F F,Bürgmann R,Banerjee P.Geodetic Slip Model of the 2011M9.0Tohoku Earthquake[J].Geophysical Research Letters,2011,38(7),doi:10.1029/2011GL048632
[2]张建国,皇甫岗,谢英情,等.中越红河断裂带考察与研究(一)[J].地震研究,2008,31(4):362-368
[3]朱俊江,詹文欢,唐诚,等.红河断裂带活动性研究[J].华南地震,2003,23(2):13-19
[4]虢顺民.红河活动断裂带[M].北京:海洋出版社,2001
[5]Wang H,Liu M,Cao J,et al.Slip Rates and Seismic Moment Deficits on Major Active Faults in Mainland China[J].Journal of Geophysical Research:Solid Earth,2011,116(B2),doi:10.1029/2010JB007821
[6]丁开华,许才军,邹蓉,等.利用GPS分析川滇地区活动地块运动与应变模型[J].武汉大学学报·信息科学版,2013,38(7):822-827
[7]王阎昭,王恩宁,沈正康,等.基于GPS资料约束反演川滇地区主要断裂现今活动速率[J].中国科学(地球科学),2008,38(5):582-597
[8]邓起东,卢造勋,杨主恩.城市活动断层探测和断层活动性评价问题[J].地震地质,2007,29(2):189-200
[9]邓起东,汪一鹏,廖玉华,等.断层崖崩积楔及贺兰山山前断裂全新世活动历史[J].科学通报,1984,29(9):557-557
[10]邓起东,张培震.史前古地震的逆断层崩积楔[J].科学通报,2000,45(6):650-655
[11]邓起东,高翔,杨虎.断块构造、活动断块构造与地震活动[J].地质科学,2009,44(4):1 083-1 093
[12]张希,郝明,贾鹏,等.全国主要构造区GPS水平运动负位错反演与应变积累特性[J].地震研究,2013,36(1):1-8
[13]申重阳,王琪,吴云,等.川滇菱形块体主要边界运动模型的GPS数据反演分析[J].地球物理学报,2002,45(3):352-361
[14]刘宝明,夏斌,李绪宣,等.红河断裂带东南的延伸及其构造演化意义[J].中国科学(地球科学),2006,36(10):914-924
[15]张清志,刘宇平,陈智梁,等.红河断裂带的GPS观测数据反演[J].地球物理学进展,2007,22(2):418-421
[16]李亚敏,徐辉龙,孙金龙,等.红河断裂带及其邻区的震源机制解特征及其反映的断裂活动分段性[J].热带海洋学报,2008,27(2):32-39
[17]赵国强,任雳.基于GAMIT/GLOBK的GPS数据处理平台搭建[J].测绘地理信息,2016,41(1):37-42
[18]王超,郭际明,周命端,等.高精度GPS数据处理中GAMIT批处理方法与实现[J].测绘地理信息,2012,37(2):10-12
[19]Pollitz F F,Bürgmann R,Banerjee P.Geodetic Slip Model of the 2011M9.0Tohoku Earthquake[J].Geophysical Research Letters,2011,38(7),doi:10.1029/2011GL048632