利用块体-位错模型反演华北地区块体运动和断裂活动  

STUDY ON CHARACTERISTICS OF TECTONIC BLOCKS AND FAULTS IN THE NORTH CHINA USING BLOCK-DISLOCATION MODEL

作　　者：朱泽[1,2] 孟国杰[1] 苏小宁[1] 金红林[1] 胡新康[3] Ge Linlin 

机构地区：[1]中国地震局地震预测重点实验室(中国地震局地震预测研究所),北京100036 [2]浙江省地震局,杭州310013 [3]中国地震局第一监测中心,天津300180 [4]澳大利亚新南威尔士大学

出　　处：《大地测量与地球动力学》2014年第4期39-42,48,共5页Journal of Geodesy and Geodynamics

基　　金：国家国际科技合作专项(2010DFB20190);国家自然科学基金项目(41174004);中国地震局地震预测研究所基本科研业务费专项(2012IES010302);地震行业科研业务费专项(200708030)

摘　　要：对华北地区1999以来的GPS观测数据进行处理,得到统一的GPS速度场。建立华北地区块体-位错模型,利用模拟退火方法,反演主要块体的运动速率和断裂的活动性参数。研究表明,相对华南块体,研究区内各块体的欧拉角速度较小,且都为顺时针运动,断裂活动性相对较弱。整体上张家口-蓬莱构造带处于左旋运动,运动速率约为1 mm/a,西段和东段表现出不同的性质,闭锁深度分别为40 km和30 km。山西断裂带具有一定程度的右旋走滑,走滑速率约为1 mm/a,断裂锁定深度为30 km。郯庐断裂带表现为右旋走滑,走滑速率在1 mm/a左右,断裂锁定深度为40 km。A consistent velocity field was derived from the GPS observations carried out in north China starting from 1999. A block-dislocation model was established and the characteristics of major tectonic blocks and faults were analyzed using the simulated annealing algorithm. The result shows that the Euler vectors of all tectonic blocks are relatively smaller with respect to the South China block. Fault activities are insignificant generally. Zhangjiakou- Penglai Tectonic Belt is undergoing left-lateral motion, with a slipping rate of 1 mm/a. The western segment and the eastern segment of the Belt are different in terms of slipping magnitude, with locking depths in 40 km and 30 kin, respectively. Shanxi Fault Belt is characterized by a right-lateral slipping with a rate of 1 ram/a, and a locking depth of 30 km. Tanlu Fault exhibits right-lateral motion, with a slipping rate of 1 mm/a, and a locking depth of 40 km.

关 键 词：活动块体 位错 GPS 断裂活动 

分 类 号：P315.7[天文地球—地震学]