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利用3种不同视线向LOS(Line Of Sight)的ENVISAT ASAR数据进行干涉处理,提取多视线向(Multi-LOS)的同震形变场;结合同震形变场特征与震源机制解,构建了改则地震双断层破裂模型;利用四叉树采样后的多视线向同震形变场进行约束,通过梯度下降法(Steepest Descent Method,SDM)与Crust2.0地壳分层模型反演了改则地震的同震滑动分布特征。结果表明:反演的形变残差得到有效控制,基本介于0±10 cm之间;主震断层的滑动量主要位于断层面2—16 km深部,最大滑动量可达1.34 m,位于断层面6.4 km深处;余震断层滑动量主要位于断层面2—6 km深部,最大滑动量可达0.90 m,位于断层面3.52 km深处;主震断层与余震断层均以正断为主,但主震断层还具有一定的左旋走滑分量,而余震断层的左旋走滑不明显;当剪切模量μ取3.2×1010Pa时,反演获得的主震与余震地震矩M0分别为6.34×1018N·M与1.20×1018N·M,分别相当于矩震级MW6.47与MW5.98。
Three different lines of sight were used to interfere with the LIS (Line Of Sight) ENVISAT ASAR data to extract the coseismic deformation field of Multi-LOS. Based on the coseismic deformation field and focal mechanism solution, Earthquake double fault rupture model. After the quad-tree sampling, the multi-line of sight is used to constrain the coseismic deformation field. The Sterepest Descent Method (SDM) and the Crust 2.0 crustal layered model are used to retrieve the Seismic slip distribution characteristics. The results show that the deformation residuals of the inversion are effectively controlled, which are basically between 0 ± 10 cm. The slip of the main fault is mainly located in the depth of 2-16 km on the fault plane with the maximum slip up to 1.34 m, 6.4 km deep; aftershock fault slip is mainly located 2-6 km deep fault, the maximum slip up to 0.90 m, located in the fault plane 3.52 km deep; main fault and aftershock faults are mainly normal, but the main The faulting also has a component of left-lateral strike-slip and the left-lateral strike-slip of the aftershock fault is insignificant. When the shear modulus μ is taken as 3.2 × 1010Pa, the seismic moment M0 of the main and aftershocks obtained by inversion is 6.34 × 1018N · M and 1.20 × 1018N · M, respectively, corresponding to the moment magnitude MW6.47 and MW5.98.