昆仑山地震前后基线变化特征研究  

ON SENSIBILITY OF GPS BASELINE LENGTH AND DIRECTION CHANGES BEFORE AND AFTER KUNLUN MOUNTAIN EARTHQUAKE

作　　者：闫伟[1] 牛安福[2] 江在森[1] A Ponomarev 

机构地区：[1]中国地震局地震预测研究所,北京100036 [2]中国地震台网中心,北京100036 [3]Институт Ф изики Земли им.Шмидта,РАН

出　　处：《大地测量与地球动力学》2007年第F06期8-11,共4页Journal of Geodesy and Geodynamics

基　　金：国家科技支撑计划(2006BAC01B02-02-01);地震科学联合基金(A07147)

摘　　要：应用中国地壳观测网络GPS基准站连续观测资料,研究了昆仑山地震前后基线长度及方向的变化特征;根据昆仑山地震破裂方向,讨论了不同方位基线变化特征的差异性,并从理论上探讨了基线长度与基线方向变化的灵敏性问题。研究结果表明:1)当基线方向与地震破裂方向近于一致时,基线长度的灵敏性要高于基线方向的灵敏性;2)当基线方向与地震破裂方向近于垂直时,基线方向的灵敏性要高于基线长度的灵敏性;3)当基线方向与地震破裂方向成45°时,基线长度和基线方向在震前有可能发生显著的变化。On the basis of the data of Crustal Movement Observation Network of China（ CMONOC）, the characteristics of baseline length and direction changes before and after Kunlun Mountain earthquake are studied. According to the rupture direction of Kunlun Mountains earthquake and the characteristic difference in the different bearing of baseline change, the sensibility problem that related change of baseline length and direction to the earthquake are discussed theoretically. The study shows that： 1 ） If the baseline direction is consistent with the earthquake＇ s fracture direction then the sensibility of baseline length will be higher than baseline direction ; 2） If the baseline direction is vertical to the earthquake＇ s fracture direction then the sensibility of baseline direction is higher than baseline length; 3）If the baseline direction makes angle 45° to the earthquake＇s fracture direction then both the baseline length and baseline direction may evidently change before the earthquake.

关 键 词：昆仑山口西8.1级地震 GPS 基线方向 基线长度 位错 

分 类 号：P315.725[天文地球—地震学]