海底震后形变多基站联合估计模型  

Post-seismic deformation jointly estimated by multi seafloor geodetic stations

作　　者：薛树强[1] 肖圳 董杰 韩保民[2] 孙悦 杨文龙 XUE ShuQiang;XIAO Zhen;DONG Jie;HAN BaoMin;SUN Yue;YANG WenLong(Chinese Academy of Surveying and Mapping,Beijing 100830,China;Shandong University of Technology School of Civil Engineering and Geomatics,Zibo Shandong 255049,China)

机构地区：[1]中国测绘科学研究院地理信息工程国家重点实验室,北京100830 [2]山东理工大学建筑工程与空间信息学院,山东淄博255049

出　　处：《地球物理学报》2024年第3期1013-1021,共9页Chinese Journal of Geophysics

基　　金：国家自然科学基金(41931076);崂山实验室科技创新项目(LSKJ202205100,LSKJ202205105)资助。

摘　　要：海底基准站坐标时序可用于海底震后形变监测,但受观测条件和观测成本所限,海底基准站定位精度相对较低,难以获取高时间分辨率海底基准站坐标时序.针对小样本、非连续海底观测时序分析问题,本文提出将站速度、震后形变参数作为多个邻近基准站的公共参数进行联合估计,并将N-E方向震后形变弛豫因子也作为公共参数;提出了求解站坐标、站速度等线性参数与震后形变非线性参数进行混合非线性估计的“一步法”.试验表明,相对单站估计模型,本文提出的多站联合估计模型可克服海底基准站坐标时序样本有限和精度受限等问题,且相对于站速率和震后形变参数分离估计的“两步法”,“一步法”更为严密,可获得更为有效的震后形变参数估计.The coordinate time series of the seafloor reference station can be used for monitoring the submarine earthquake. Due to limitation of the observation condition and high-cost of the re-measurement, the positioning accuracy of the seafloor geodetic station is relatively low and it is also difficult to obtain seafloor geodetic coordinate time series of high temporal-resolution for the seafloor geodetic station deformation. For the geodetic coordinate time series of small sample and discontinuity, we propose a joint estimation model with station velocity and post-seismic deformation as the common parameters of adjacent reference stations. Furthermore, the post-seismic deformation relaxation factors of N and E directions are also treated as common parameters to be estimated;meanwhile, we propose an one-step method for solving the linear-nonlinear mixed model where the linear parameters include the station coordinates and station velocity and the nonlinear ones are the post-seismic deformation parameters. The test results show that, compared with the single station estimation model, the proposed joint estimation model can overcome the small sample and relatively low accuracy of the seafloor geodetic coordinate series. Compared to the two-step method producing the station velocity and post-seismic deformation parameters independently, the one-step method is more rigorous to effectively estimate the post-seismic deformation parameters.

关 键 词：海底大地测量 站速度 海底地震 震后形变 

分 类 号：P229[天文地球—大地测量学与测量工程] P738[天文地球—测绘科学与技术]