华北地块内部主要断层运动模型的GPS数据反演分析  

GPS DATA INVERSION ANALYSIS OF THE MOVEMENT MODELS OF MAIN FAULTS WITHIN THE NORTH CHINA BLOCK

作　　者：申重阳[1] 吴云[1] 杨少敏[1] 乔学军[1] 高士钧[1] 

机构地区：[1]中国地震局地震研究所,武汉430071

出　　处：《地壳形变与地震》2001年第4期33-42,共10页Crustal Deformation and Earthquake

基　　金：国家 973计划项目G19980 40 70 3;国家科技攻关项目 96 913 0 9(重中之重 )的资助

摘　　要：利用华北地区 1993～ 2 0 0 0年的高精度GPS观测处理结果 ,采用稳健—贝叶斯最小二乘算法与多断裂位错模型 ,初步分析研究了华北地块内部主要断层现今运动定量模型 ,得到下列结果 :(1)其主要断裂带的走滑运动速率介于 0 .0 3至 3.2cm/a之间 ,1.0至 2 .0cm/a之间者居多 ;其倾滑运动速率介于 0 .9至 8.3cm/a之间 ,1.0至 2 .8cm/a之间者居多 ,一般大于走滑运动速率 ;其张裂运动速率介于 0 .0 4至 3.5cm/a之间 ,0 .0至 0 .8cm/a之间者居多。 (2 )总体来说 ,其主要断裂运动具有继承性 ,西部 (大致以东经 114°为界 )断层运动大于东部断层运动。 (3)其主要断层现今运动以垂直升降运动为主 ,兼有走滑、伸展特征。 (4)依据反演结果 ,讨论了断层运动与地震孕育的关系 ,若将断层运动视为局部“闭锁”地区的弹性应力应变集中或地震能量积累 ,各断层每年有相当于 5 .1～ 7.Using the result of the high precision GPS observation from 1993 to 2000 in North China region and adopting the robust Bayes least squares estimation and the model of multi faults,the present quantitative models of the main faults movement within the North China block are analyzed. Thus the following knowledges are given:(1) its strike-slip velocity is between 0.03 and 3.2 cm per year,the most between 1.0 to 2.0 cm per year;its dip slip velocity is between 0.9 and 8.3cm per year,the most between 1.0 and 2.8 cm per year,they are commonly bigger than that of strike slip and its tensile fault velocity is between 0.04 and 3.5 cm per year,the most between 0.0 and 0.8 cm per year, (2)in general, the main fault movement takes on inheritance,the faults movement on the west (approximately take the eastern longitude 114 degree as the division) is bigger than that on the east, (3)its main present fault movement is mostly upright,with strike slip and stretch character, (4)from the results,the relation between fault movement and earthquake genestration is discussed,if the fault movement is regarded as the elastic stress and strain concentration or earthquake energy accumulation in the local 'lock' zone, the seismic energy accumulation of every fault will correspond to an earthquake of magnitude 5.5～7.0 per year.

关 键 词：GPS数据 华北地块 断层运动模型 稳健-贝叶斯最小二乘法 全球定位系统 走滑运动速率 

分 类 号：P315.2[天文地球—地震学]