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  刘瑞春,荆红亮.临汾水准巨幅形变的位错理论模拟与异常性质判定[J].震灾防御技术,2015,10(2):397-404, DOI:10.11899/zzfy20150220.

临汾水准巨幅形变的位错理论模拟与异常性质判定
摘要:    在假设临汾台水准出现2次巨幅形变异常为断裂错动的情况下,笔者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了实测。分析结果表明:①从理论上讲,罗云山断裂(土门-峪里段)错动是可以产生长轴与断裂走向平行的椭圆状变形区域,其中,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;2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而同期D-InSAR实测形变场显示,临汾台水准出现2次巨幅异常期间,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,其变形范围约为10—12mm和1—5mm。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,说明断裂活动不是临汾台水准出现2次巨幅形变的主要原因,可能为断裂上盘的土层点局部变形所致。④通过断层位错模型的理论模拟与D-InSAR技术的实际监测相结合,可以有效地确定临汾台跨断层水准出现的2次巨幅形变异常的性质,可为重大水准异常的核实提供科学依据。
作者单位
刘瑞春 山西省地震局预报中心太原030021
太原大陆裂谷动力学国家野外科学观测研究站太原030021 
荆红亮 临汾中心地震台临汾041000 
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:10.11899/zzfy20150220
基金项目:山西省科技攻关计划项目(20140313023-1);地震行业科研专项“中国综合地球物理场观测——鄂尔多斯地块周缘地区”(201208009-14);山西省青年科技研究基金(2011021024-1)
收稿日期:2014-05-26
作者简介:刘瑞春,男,生于1982年。2007年获硕士学位,工程师。现主要从事地震地壳形变方面的研究。E-mail: 24547716@qq.com
通讯作者:
Simulation by Dislocation Model and Anomaly Property Determination of Huge Leveling Deformation at Linfen Seismostation
Abstract:      In this paper, supposing the two times of huge leveling deformation anomaly at Linfen seismostation were caused by Luoyunshan fault (Tumen-Yuli section) movement, we computed the vertical deformation field distribution based on rectangular fault dislocation model, meanwhile we monitored the ground deformation field of study area by 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 locates in the center of the area in the hanging wall of the fault, and the deformation gradually decreases to zero toward the periphery, the two times of movement lead to the different area of effect. The long axises are about 18km and 26km, the short axises are about 12km and 17km, the obvious deformation range 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 exists land subsidence possibly caused by groundwater excessive exploitation, with the deformation range about 10-12mm and 1-5mm. (3) The measured deformation field is not consistent with the theoretical result in deformation area and amplitude, which indicates that the fault movement is not the main cause of Linfen huge leveling deformation, it may be because of local deformation of the soil mark stone in hanging wall of the fault. (4) By combining the fault dislocation model simulation with the D-InSAR technology measurement, we can determine the anomaly property effectively when the cross fault leveling huge deformation occurs, which can provide scientific basis for the great leveling anomaly verification.
Keywords:  The leveling at Linfen seismostation  Huge deformation  Fault dislocation model  D-InSAR  Anomaly property determination
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