利用GPS资料研究郯庐带现今运动及变形状态

Motion and Deformation State of the Tancheng-Lujiang Fault Zone Derived from GPS Data

本文利用华北地区1999—2001年,2001—2004年,2004—2007年及2007—2009年四期GPS速度场资料,基于块体的整体旋转与均匀应变模型,分析了郯庐断裂带中南段的运动及变形特征。结果显示:潍坊—郯城段主要为右旋走滑的变形特征,而郯城—庐江段则为左旋滑动的变形特征,两段垂直断层方向上的变形表现为"张压交替"的特征。基于刚体运动模型,计算了扣除环渤海湾区域整体刚性运动的华北地区GPS速度场,并分析了环渤海湾区域块体的变形状态,结果显示环渤海区虽然各期的变形特征不同,特别是郯庐带附近,各期的运动特征差异较大,但基本可反映燕山—渤海地震带是运动特征差异的分界线,且每期郯庐带各站点的一致性运动明显。

Based on the rotation in the entire block and homogeneous strain model（REHSM）,we firstly analyzed the motion and deformation features across the southern part of Tanlu fault from GPS velocity fields in period of 1999—2001,2001—2004,2004—2007 and 2007—2009.The results showed dextral strike-slip feature in Weifang-Tancheng segment while sinistral strike slip in Tancheng-Lujiang segment.And the deformation features perpendicular to Tanlu faults has alternated between tension and compression in different time-intervals.Then we resolved the relative rigid motion of blocks around Bohai Bay to the entire Bohai area by deducting the entire rigid motion of the Bohai area.We found that Yanshan-Bohai seismic belt splits this area into two parts,the northern one moved to northwest while the other to southeast.