利用GPS资料研究燕山-渤海带的运动状态

STUDY ON MOTION AND DEFORMATION STATE OF YANSHAN-BOHAI ZONE FROM GPS DATA

利用华北地区1999—2007年的GPS速度场资料,分析了燕山-渤海带的运动、变形状态及各时段不同位置的滑动和拉张速率。其中,1999—2001年阴山带表现为左旋剪切兼拉张的变形特征,但运动速率都不大,滑动速率不超过1.0mm/a,拉张速率不超过1.35mm/a;2004—2007年,阴山带的左旋滑动速率为0.04～1.59mm/a,拉张特性不显著,并且在2001—2004年该边界带活动明显减弱。张家口-渤海带在3个时间段均表现为左旋变形特征,滑动速率为0.7～1.55mm/a,有时挤压有时拉张,但速率都不超过1.0mm/a。

Using the GPS velocity field data from 1999 - 2007, we studied the movement and state of Yanshan- Bohai zone and calculated the relative movement of different parts in different periods. In 1999 - 2001 period, Yin- shan zone was a left-lateral extension strike slip belt with the slip rate less than 1.0mm/a and extension rate less than 1.35 mm/a, in 2001 -2004 and 2004 -2007 periods, it kept left-lateral strike slip with the rate of 0.04 ram/ a- 1.59 mm/a, but the extensional feature was not obvious. Furthermore, its motion became obviously slow in 2001 -2004. The deformation character of Zhangjiakou-Bohai zone was left lateral strike slip in the three periods with amplitude of 0.7 mm/a - 1.55 mm/a. Though its deformation state varied from time to time, the rate was always less than 1.0 mm/a. In conclusion, it was compressed in the north and west of Yanshan-Bohai zone while tensed in the southern and eastern part.