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临汾水准巨幅形变的位错理论模拟与异常性质判定
刘瑞春1,2) 荆红亮3)
1 山西省地震局预报中心,太原 030021/2 太原大陆裂谷动力学国家野外科学观测研究站,太原 030021/3 临汾中心地震台,临汾,041000
摘要:
在假设临汾水准两次巨幅形变异常为断裂错动的情况下,基于矩形断层位错模型模拟了罗云山断裂(土门-峪里段)错动所引起的垂直形变场分布,并通过D-InSAR技术对研究区域内的地面形变场进行实测,分析结果表明:(1)断裂错动理论上可导致长轴与断裂走向平行的椭圆状变形区域,位于断裂上盘的区域中心变形量最大,变形量向外围逐渐衰减为零,两次错动导致的变形波及范围分别约为长轴18Km和26Km,短轴12Km和17Km,显著变形幅度分别约为1-3mm和4-14mm。(2)D-InSAR实测形变场显示两次异常期间研究区域内未发现与断裂走向一致的连续变形区域,仅在盆地内部存在可能由于过量开采地下水所导致的地面沉降,变形范围约为10-12mm和10-15mm。(3)实测形变场与理论形变场在变形区域和变形幅度上均不一致,说明断裂活动引起临汾水准巨幅形变的可能性不大,可能为断裂上盘的土层局部变形所致。(4)通过断层位错模型的理论模拟和D-InSAR技术的实际监测相结合可以有效地确定跨断层水准巨幅形变异常的性质,为重大水准异常核实提供科学依据。
关键词:  临汾水准  巨幅形变  断层位错模型  D-InSAR  异常性质判定
DOI:
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Simulation by Dislocation Model and Anomaly Property Determination of Huge Leveling Deformation at Linfen Seismic Station
Liu Ruichun1,2) and Jin Hongliang3)
1) Forecasting Center of Earthquake Administration of Shanxi Province,Taiyuan 030021,China/2) National Continental Rift Valley Dynamics Observatory of Taiyuan,Taiyuan 030021,China/3) Linfen Central Seismic Station,Linfen 041000,Shanxi,China
Abstract:
In this study,under the assumption that the two huge leveling deformation anomalies at Linfen seismic station were caused by the Luoyunshan fault ( Tumen-Yuli section ) movement,we computed the vertical deformation field distribution based on the rectangular fault dislocation model and measured the ground deformation field of the study area using D-InSAR technology. The results are as follows: (1) Theoretically,the ground vertical deformation field caused by fault movement could be within the elliptical deformation area with the long axis parallel to the fault strike. The largest deformation region is located in the center of the area in the hanging wall of the fault,and the deformation gradually decreases to zero toward the periphery; the impact range induced by the two deformations is respectively as follows: The long axes are about 18km and 26km,the short axes are about 12km and 17km and the obvious deformation amplitude is about 1 -3mm and 4 - 14mm. (2) The measured deformation field by D-InSAR shows that there is no continuous deformation area consistent with the fault strike,and only the presence of land subsidence possibly caused by groundwater excessive exploitation,with the deformation amplitude about 10 -12mm and 1 -5mm. (3) The measured deformation field is not consistent with the theoretical result on deformation area and amplitude,which indicates that the fault movement is not the main cause of Linfen huge leveling deformation,but may rather be because of local deformation of the soil layers in the hanging wall of the fault. (4) By combining the fault dislocation model simulation with the D-InSAR technology measurement,we can determine effectively the nature of the anomaly of the huge cross-fault leveling deformation,thus provide scientific basis for verification of significant leveling anomalies.
Key words:  The leveling at Linfen seismic station  Huge deformation  Fault dislocation model  D-InSAR  Anomaly property determination