用GPS数据反演分析海原断裂带分段活动特征
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摘要
首先应用1999-2007年的GPS观测资料分析海原断裂带的运动特征,看出期间该断裂带GPS站点运动速度由南向北逐渐衰减,在NWW和NE走向断层两盘的运动差异较为明显,断层的活动以走滑运动为主。然后依据地质、地球物理等资料给出反演参数初值,利用水平形变资料对断裂三段的走滑速率及断层下界深度进行反演。结果为从西到东断裂带各段走滑速率分别为8.25mm/a、5.49 mm/a和5.97 mm/a,断层底部深度依次为22.8 km;13.3 km;11.1 km。综合分析认为毛毛山-老虎山断裂运动速度明显高于海原断裂速度,在速度变化梯度较大的毛毛山断裂存在6级以上地震空区,推测具有发生强震的危险性。
The active characteristics of Haiyuan fault belt are analyzed using GPS data during 1999-2007 firstly.The surveying data show that the movement rates of those GPS sites become decreasing from south to north,especially the rates on two sides of the NWW and NW diration faults have big difference,and the fault movement is mainly strike-slip.Then the initial parameters of inversion are given based on the information of geology and geophysics.The slipping rates and depths of three subsections of Haiyuan fault belt are inversed with constrains of GPS profiles data.The result show that the rates from west to east are 5.49 mm/a,5.97 mm/a and 8.25 mm/a respectively and the depths are 22.8 km,13.3 km and 11.1 km respectively.Through comprehensive analysis on the GPS data and parameters of the fault it is concluded that the movement rate on Maomaoshan-Laohushan fault segment is faster than that on Haiyuan fault segment.Maomaoshan fault has big rate grads where also is earthquake vacancy(ML>6.0),so this region exists risk of strong earthquake.
The active characteristics of Haiyuan fault belt are analyzed using GPS data during 1999-2007 firstly.The surveying data show that the movement rates of those GPS sites become decreasing from south to north,especially the rates on two sides of the NWW and NW diration faults have big difference,and the fault movement is mainly strike-slip.Then the initial parameters of inversion are given based on the information of geology and geophysics.The slipping rates and depths of three subsections of Haiyuan fault belt are inversed with constrains of GPS profiles data.The result show that the rates from west to east are 5.49 mm/a,5.97 mm/a and 8.25 mm/a respectively and the depths are 22.8 km,13.3 km and 11.1 km respectively.Through comprehensive analysis on the GPS data and parameters of the fault it is concluded that the movement rate on Maomaoshan-Laohushan fault segment is faster than that on Haiyuan fault segment.Maomaoshan fault has big rate grads where also is earthquake vacancy(ML>6.0),so this region exists risk of strong earthquake.
引文
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[14]田勤俭,丁国瑜,申旭辉.拉分盆地与海原断裂带新生代水平位移规模[J].中国地震,2001,17(2):167-175.
[15]王敏,沈正康,牛之俊,等.现今中国大陆地壳运动与活动块体模型[J].中国科学(D辑),2003,33(增刊):21-32.
[16]张希,江在森,王琪,等.青藏块体东北缘弹性块体边界负位错反演与强震地点预测[J].地震学报,2005,27(6):622-628.
[17]陈兵,江在森,马文静,等.青藏块体东北缘断层形变与中强地震[J].大地测量与地球动力学,2002,22(4):49-55.
[18]闵伟,张培震,邓起东,等.海原活动断裂带破裂行为特征研究[J].地质论评,2001,47(1):75-81.
[19]张培震,闵伟,邓起东,等.海原活动断裂带的古地震与强震复发规律[J].中国科学(D辑),2003,33(8):705-713.
[20]Okada Y.Surface deformation due to shear and tensile faultsin a half-space[J].Bull.Seismol.Soc.Am.,1985,7594):1135-1154.
[21]甘卫军,程朋根,周德敏,等.青藏高原东北缘主要活动断裂带GPS加密观测及结果分析[J].地震地质.2005,27(2):177-187.
[22]郭晓,张元生,莘海亮,等.祁连山中东段地区非弹性衰减系数、震源参数和场地相应研究[J].西北地震学报,2007,29(4):319-325.
[2]国家地震局地质研究所,国家地震局兰州地震研究所.祁连山-河西走廊活动断裂系[M].北京:地震出版社,1993.
[3]国家地震局国际合作司编.中法合作活断层对比研究[M].北京:地震出版社,1993.
[4]董治平,程建武,康庆强,等.祁连山构造带中强地震前广义前震活动探讨[J].西北地震学报,2008,30(1):49-55.
[5]国家地震局地质研究所,宁夏地震局等.海原活动断裂带[M].北京:地震出版社,1990.
[6]刘洪春,贾云鸿,陈永明,等.1927年古浪8级地震地表破裂带研究[A]∥活动断裂研究[G].北京:地震出版社,1995:79-91.
[7]Lasserre C,Morel P H Gaudem Y,et al..Post-glacial leftslip-rate and past occurrence ofM>8 earthquakes on the west-ern Haiyuan fault(Gansu,China)[J].J.Geophys.Res.,1999,104(B4):17633-17651.
[8]Lasserre C,Tapponnier P,Gaudem Y,et al..Fast late Pleis-tocene slip-rate on the Leng Long Ling segment of the Haiyuanfault,Qinghai,China[J].J Geophys.Res.,2002,107(B11):ETG 4-1-4-15.
[9]袁道阳,刘百篪,吕太乙.利用黄土剖面的古土壤年龄研究毛毛山断裂的滑动速率[J].地震地质,1997,19(1):1-7.
[10]何文贵,刘百篪,吕太乙,等.老虎山断裂带的分段性研究[J].西北地震学报,1994,16(3):67-72.
[11]何文贵,刘百篪,袁道阳,等.毛毛山断裂带晚第四纪话动特征[A]∥海原动断裂研究(5)[G].北京:地震出版社,1996:63-77.
[12]何文贵,刘百篪,袁道阳,等.冷龙岭活动断裂的滑动速率研究[J].西北地震学报,2000,22(1):91-96.
[13]袁道阳,张培震,刘百篪,等.青藏高原东北缘晚第四纪活动构造的几何图像与构造转换[J].地质学报,2004,78(2):270-278.
[14]田勤俭,丁国瑜,申旭辉.拉分盆地与海原断裂带新生代水平位移规模[J].中国地震,2001,17(2):167-175.
[15]王敏,沈正康,牛之俊,等.现今中国大陆地壳运动与活动块体模型[J].中国科学(D辑),2003,33(增刊):21-32.
[16]张希,江在森,王琪,等.青藏块体东北缘弹性块体边界负位错反演与强震地点预测[J].地震学报,2005,27(6):622-628.
[17]陈兵,江在森,马文静,等.青藏块体东北缘断层形变与中强地震[J].大地测量与地球动力学,2002,22(4):49-55.
[18]闵伟,张培震,邓起东,等.海原活动断裂带破裂行为特征研究[J].地质论评,2001,47(1):75-81.
[19]张培震,闵伟,邓起东,等.海原活动断裂带的古地震与强震复发规律[J].中国科学(D辑),2003,33(8):705-713.
[20]Okada Y.Surface deformation due to shear and tensile faultsin a half-space[J].Bull.Seismol.Soc.Am.,1985,7594):1135-1154.
[21]甘卫军,程朋根,周德敏,等.青藏高原东北缘主要活动断裂带GPS加密观测及结果分析[J].地震地质.2005,27(2):177-187.
[22]郭晓,张元生,莘海亮,等.祁连山中东段地区非弹性衰减系数、震源参数和场地相应研究[J].西北地震学报,2007,29(4):319-325.
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