2008、2009年柴达木盆地地震群InSAR分析及同震形变场反演

发布时间：2018-04-22 11:51

本文选题：柴达木盆地 + InSAR形变　；参考：《地震地质》2017年03期

【摘要】：对发生在青藏高原东北缘——柴达木盆地北缘的4个中等震级地震分别做了研究,其中1个地震发生在2008年,另外3个发生在2009年。利用D-InSAR技术采用Envisat ASAR降轨数据获得了这4个地震的同震形变场。结果显示,2008年地震形变场只有1个形变中心,而2009年地震有3个形变中心。2008、2009年地震引起的卫星视线向最大形变分别为0.097m和0.41m。基于弹性半空间模型和InSAR获得的地表形变场,反演了断层面滑动分布。对于2008年地震,采用了一分段断层模型,反演结果得出最大滑动为0.47m,发生在地下19km处。对于2009年发生的3个地震,结合分析InSAR同震形变场后分别采用了一分段断层、两分段断层和三分段断层模型反演,结果得出三分段断层模型模拟的形变场最符合观测到的InSAR地表形变场且残差最小,认为三分段断层模型最可靠。
[Abstract]:Four moderate earthquakes occurred in the northern margin of the northeastern margin of the Qinghai-Xizang Plateau, Qaidam Basin, respectively. One of the earthquakes occurred in 2008 and the other three occurred in 2009. The coseismic deformation fields of the four earthquakes were obtained by using the Envisat ASAR descent orbit data using the D-InSAR technique. The results show that there is only one deformation center in the earthquake deformation field in 2008 and three deformation centers in 2009 earthquake. The maximum deformation of satellite line of sight caused by the 2009 earthquake is 0.097m and 0.41mrespectively. Based on the elastic half-space model and the surface deformation field obtained by InSAR, the slip distribution of break plane is inversed. For the 2008 earthquake, a segmented fault model is used, and the inversion results show that the maximum slip is 0.47 m, which occurred at the underground 19km. For the three earthquakes that occurred in 2009, after analyzing the deformation field of InSAR coseismic, we used one segment fault, two segment fault and three segment fault model inversion, respectively. The results show that the deformation field simulated by the three-segment fault model is most consistent with the observed surface deformation field of InSAR, and the residual error is the smallest, and it is considered that the three-segment fault model is the most reliable.
【作者单位】：中国地震局地质研究所地震动力学国家重点实验室;苏州科技大学环境科学与工程学院;河南理工大学测绘与国土信息工程学院;
【基金】：地震动力学国家重点实验室自主研究课题(LED2013A02,LED2015A03) 国家自然科学基金(41140386,41374105) 中国地震局地质研究所基本科研业务专项(DFIGCEA201217)共同资助
【分类号】：P315

【相似文献】