基于实测值分段线性内插模型的INSAR视线向同震位错分解——以青藏高原昆仑山MS8.1地震为例

DECOMPOSING InSAR LOS DISPLACEMENT INTO COSEISMIC DISLOCATION BY LINEAR INTERPOLATION MODELING

利用现场GPS定位的实测值,在尝试过最小二乘拟合并取得初步成果的基础上,进而采用更符合破裂带形态的线性立方插值函数,在破裂带主断面上,建立起一种理论与实测相结合的INSAR视线向(LOS)变化量的分解方程,得到了INSAR视线向位移分解的具有唯一性的解析解.本文的解析法吸纳了GPS定点实测值的精度优势,利用INSAR全天候、准实时获取连续形变场的技术特点,通过数学近似,最终获得了主破裂带上连续变化的水平位错及垂直位错同震形变曲线.

In this paper, having tried a least square fitting models and gained preliminary conclusion, based on the firsthand observations made in the field by GPS, a linear interpolation model which fits the feature of rupture zone well is set up. An equation about decomposing co-seismic dislocation from InSAR slant range is set up and a unique value of the horizontal and vertical components is got. The method not only absorbs the authenticity and precision of fieldwork, but also it makes use of the InSAR technical characteristics such as real time, continuous record and all-weather etc. By approximation step by step coseismic horizontal and vertical components curves are gotten along with main earthquake rupture zones.