摘要
利用GPS资料,用地壳运动强度和大空间尺度变形分析了张家口—渤海断裂带的活动性。结果表明,燕山地块与华北平原的地壳运动强度以张—渤带为明显的分界线,张-渤带以左旋走滑为主。通过最小二乘配置对GPS资料进行了空间去噪声处理,并建立球面位错模型,反演了张—渤带的11条断层,结果表明:NW向断层以左旋走滑为主;NE向断层中,活动性最强的是以倾滑为主的沧东断裂。2001—2004年时段与1999—2001年时段相比,张—渤带中西段、西段断层的走滑量略有减小,而其中东段、东段的走滑量有较大程度增大。这种现象可能与该区域构造应力场有关。
The paper analyzes the crustal movement intensity and large spatial deformation of the Zhangjiakou-Bohai fault system using GPS data. The result shows that the Zhangjiakou-Bohai fault system is an obvious crustal movement intensity boundary between the Yanshan block and Huabei plain, and mostly left-lateral strike-slip. The spatial noises in the data have been weakened by least squares collocation and eleven faults are inversed by a spherical dislocation model. It is concluded that faults in the NW direction are mostly left-lateral strike-slip, but the activity of Cangdong faults in the NE direction is the strongest, and mostly dip slip. Compared to the period of 1999--2001, strike-slip in the period of 2001--2004 decreased slightly in the mid-west and west segment, and apparently increased in mid-east and east segment.
出处
《地震》
CSCD
北大核心
2009年第3期136-140,共5页
Earthquake
基金
国家科技支撑计划(2006BAC01B02-02-05)资助
