从 Sentinel-1 InSAR 看整个西安纳托利亚伸展省(土耳其)的活动变形。

IF 3.3 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Tectonics Pub Date : 2024-11-01 Epub Date: 2024-11-24 DOI:10.1029/2023TC008086
Manuel Diercks, Ekbal Hussain, Zoë K Mildon, Sarah J Boulton, Milan Lazecký
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引用次数: 0

摘要

由于全球导航卫星系统(GNSS)网络的密度通常不足以分辨单个断层的变形,因此对主要向南北方向变形的断层网络的震间变形进行量化是一项挑战。干涉合成孔径雷达(InSAR)是一种替代方法,具有较高的空间分辨率,但由于对南北向运动的敏感度较低而受到限制。我们利用 InSAR 研究了图尔基耶西部的活动正断层网络,该网络正在经历快速的 N-S 延伸。由于研究区域内的大多数断层都是正断层,我们通过重点研究垂直变形成分来克服对 N-S 运动的低灵敏度问题,这本身就带来了挑战。充满沉积物的地堑显示出人为引起的快速下沉,而城市地区则倾向于错误的隆起信号。此外,形态起伏也会对 InSAR 信号造成地形和大气干扰。针对这些挑战,我们的解决方案是对高分辨率垂直速度场进行系统分析,以深入了解区域变形模式,并结合对西安纳托利亚伸展省个别断层沿线变形的详细调查。我们发现,大型地堑系统的构造变形并不局限于主要断层。较小且看似不那么活跃的断层也在承受应变,这有利于变形的连续模型而不是块体模型。我们还观察到近期地震活动与活跃的震间地表变形之间的潜在关联。观测到的变形率为该地区许多断层的当前活动提供了估计值。我们讨论了 InSAR 时间序列分析在扩展机制方面的潜力和局限性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Active Deformation Across the Western Anatolian Extensional Province (Türkiye) From Sentinel-1 InSAR.

Quantifying interseismic deformation of fault networks which are predominantly deforming in a north-south direction is challenging, because GNSS networks are usually not dense enough to resolve deformation at the level of individual faults. The alternative, interferometric synthetic aperture radar (InSAR), provides high spatial resolution but is limited by a low sensitivity to N-S motion. We study the active normal fault network of Western Türkiye, which is undergoing rapid N-S extension, using InSAR. Since most faults in the study region are normal faults, we overcome the low N-S sensitivity by focusing on the vertical deformation component, which presents its own challenges. Sediment-filled grabens show rapid anthropogenically induced subsidence, whereas urban areas tend toward erroneous uplift signals. Additionally, the morphological relief results in topographic and atmospheric disturbances of the InSAR signal. Our solution to these challenges is a systematic analysis of the high-resolution vertical velocity field to deduce insights into regional deformation patterns, combined with detailed investigations of deformation along individual faults in the Western Anatolian Extensional Province. We show that tectonic deformation in the large graben systems is not restricted to the main faults. Smaller and seemingly less active faults are accommodating strain, favoring a continuum model of deformation over block models. We also observe a potential correlation between recent seismicity and active interseismic surface deformation. Observed deformation rates provide an estimate of current activity for many faults in the region. We discuss the potential and limitations of InSAR time series analysis for extensional regimes.

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来源期刊
Tectonics
Tectonics 地学-地球化学与地球物理
CiteScore
7.70
自引率
9.50%
发文量
151
审稿时长
3 months
期刊介绍: Tectonics (TECT) presents original scientific contributions that describe and explain the evolution, structure, and deformation of Earth¹s lithosphere. Contributions are welcome from any relevant area of research, including field, laboratory, petrological, geochemical, geochronological, geophysical, remote-sensing, and modeling studies. Multidisciplinary studies are particularly encouraged. Tectonics welcomes studies across the range of geologic time.
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