联合测震和GPS资料反演双溪-焦溪垟断裂运动特征  

Inversion of movement characteristics of Shuangxi-jiaoxilang fault joint using seismic and GPS data

作　　者：龚俊 汪贞杰 戴煜暄 GONG Jun;WANG Zhenjie;DAI Yuxuan(Zhejiang Earthquake Agency,Hangzhou 310013,China;Surveying and Mapping Science Institute of Zhejiang,Hangzhou 311100,China)

机构地区：[1]浙江省地震局,杭州310013 [2]浙江省测绘科学技术研究院,杭州311100

出　　处：《测绘科学》2021年第12期1-6,15,共7页Science of Surveying and Mapping

基　　金：浙江省地震局科技项目(2020ZJJ04);浙江省地震局“水库地震研究”科技创新团队资助项目。

摘　　要：针对GPS应用于监测双溪-焦溪垟断裂的运动特征的问题,通过分析文成县和泰顺县交界地区8个测震台和长达12 a 2个跨断层的GPS观测资料,分别采用CAP方法与大地线和沿该断裂进行投影得到的时间序列进行分析,得到测震和GPS一致的观测结果。研究表明:2014年震群期间,双溪-焦溪垟断裂具有右旋走滑特征,位错约4 mm;GPS观测具有长期稳定的优势,对揭示地球物理过程具有重要意义;GPS观测的误差为毫米级,对于运动量很小的断裂通过长期观测和不同方向的分解等方法可以监测到细微变形特征;对于具有震群性质的小地震(震级大于或等于3级、小于5级),GPS依然可以提供断裂地表破裂的绝对值。In view of the problem that GPS is applied to monitor the motion characteristics of Shuangxi-jiaoxilong fault, through the analysis of 8 seismometers and 2 cross faults GPS observation data in the border area of Wencheng County and Taishun County for 12 years, the CAP method and the time series obtained by geodesic and projection along the fault, and the consistent observation results of seismometry and GPS are obtained, The results show that during the earthquake swarm in 2014,the Shuangxi-jiaoxilong fault has the characteristics of dextral strike slip, and the dislocation is about 4 mm;GPS observation has the advantage of long-term stability, which is of great significance to reveal geophysical processes;The error of GPS observation is millimeter level. For faults with small movement, fine deformation characteristics can be monitored through long-term observation and decomposition in different directions;For small earthquakes with the nature of earthquake swarm(magnitude greater than or equal to magnitude 3 and less than magnitude 5),GPS can still provide the absolute value of fault surface rupture.

关 键 词：双溪-焦溪垟断裂 CAP 震源机制 震群 GPS 地表破裂 

分 类 号：P228[天文地球—大地测量学与测量工程]