InSAR大气误差改正及其在活动断层形变监测中的应用

发布时间：2018-01-30 07:58

本文关键词： InSAR 大气改正活动断层震间形变老虎山断裂　出处：《地震学报》2017年03期 　论文类型：期刊论文

【摘要】：为了获取青藏高原东北缘老虎山断裂带精确的震间形变速率场,通过对短时间基线干涉图大气改正效果的评价,从3种外部大气数据(MERIS,ERA-I,WRF)中确定出最优的大气改正方法,用于长时间基线干涉图中的大气信号改正;然后利用层叠法(stacking)累积平均经大气和轨道改正后的干涉图,获取了研究区的震间形变速率场.结果显示:海原断裂系统区域内,MERIS和ERA-I的大气改正效果优于WRF;MERIS和ERA-I的改正结果给出了相似的形变速率场,断层两盘相对形变速率为视线向2.5mm/a,转换成平行于断层方向为6.5mm/a,与GPS结果一致;在近断层5km的范围内,出现了较大的形变梯度,揭示了浅层蠕滑的存在.
[Abstract]:In order to obtain the accurate interseismic deformation rate field of the Laohushan fault zone in the northeastern margin of the Qinghai-Xizang Plateau, the effect of atmospheric correction of the short-time baseline interferogram was evaluated, and three kinds of external atmospheric data were obtained from MERIS. The optimal atmospheric correction method is determined in ERA-IWRFs, which can be used to correct atmospheric signals in long time baseline interferogram. Then the interseismic deformation rate field of the studied area is obtained by using the accumulated average interferogram corrected by the atmosphere and orbit using the stacking method. The results show that the deformation rate field in the Haiyuan fault system region is obtained. The atmospheric correction effect of MERIS and ERA-I is better than that of WRF. The correction results of MERIS and ERA-I show a similar deformation rate field. The relative deformation rate of the two fault plates is 2.5 mm / a in line of sight and converted to 6.5 mm / a parallel to the fault direction. The results were consistent with those of GPS. Within the range of 5 km near the fault, there is a large deformation gradient, which reveals the existence of shallow creep.
【作者单位】：中国石油大学(华东)地球科学与技术学院;中国地震局地质研究所地震动力学国家重点实验室;
【基金】：中国地震局地质研究所所长基金(IGCEA1515) 地震动力学国家重点实验室项目(LED2013A02) 国家自然科学基金(41461164002,41631073)共同资助
【分类号】：P315.725
【正文快照】： 引言合成孔径雷达干涉(interferometry synthetic aperture radar,简写为InSAR)技术作为一种获取大面积地形、地表位移的有效手段被广泛应用于地形图测绘、土地利用类型分类、海洋风浪场反演等领域,特别是在地震(Lindsey et al,2015)、火山活动(Gong et al,2015)、冰川漂移(Li

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