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针对2013年四川芦山7.0级地震震源机制与GPS同震位移场不完全一致的问题,利用高精度水平仪对LS05、LS06等6个GPS连续观测临时站观测墩进行了倾斜测量,对SCTQ墩面水准点高差进行了复测,并对该区域地表变形进行了调查。倾斜测量结果表明,LS06等5个站观测墩相对建站时均无明显倾斜。LS05站观测墩标的确相对建站时发生了倾斜,估计其倾斜量在0.4°~1.2°,倾斜方向以NW为主。无论该点倾斜发生于哪个时段,均不影响同震位移以S向运动为主的特征。对SCTQ基准站观测墩面水准测量结果表明,该站点观测墩非常稳定,未发生倾斜。野外地表调查表明,地壳挤压缩短变形特征较为明显,LS05测点周边确有SW向加速运动和剪切变形现象。综合分析认为,LS05、SCTQ和LS06等GPS测点表现出的左旋应变释放特征真实可靠。
Aiming at the problem that the focal mechanism of the Lushan MS7.0 earthquake in Sichuan Province and the GPS co-seismic displacement field are not exactly the same in 2013, six high precision level instruments were used to measure the inclination of six observation stations of LS05 and LS06, The point height difference was retested, and the surface deformation in the area was investigated. The tilt measurement results show that there is no obvious slope when the observation stations of five stations such as LS06 are relative to the station. The abutment of LS05 station is indeed inclined relative to the station, and the inclination is estimated to be between 0.4 ° and 1.2 ° with NW as the main tilt direction. No matter when the point occurs, it does not affect the feature that the coseismic displacement is dominated by S-direction movement. The measurement results of pier surface of SCTQ base station show that the observed piers at this station are very stable with no inclination. Field surface survey shows that crustal crust shortening deformation characteristics are obvious, LS05 measuring point does have SW acceleration and shear deformation around the phenomenon. According to a comprehensive analysis, the left-handed strain release characteristics exhibited by GPS measurement points such as LS05, SCTQ and LS06 are reliable.