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Quaternary deformation patterns in East–Central Iran, constrained by coseismic–postseismic displacements of the 2017 Hojedk triplet earthquake in the Kerman Province
Journal of Geodynamics ( IF 2.3 ) Pub Date : 2022-09-21 , DOI: 10.1016/j.jog.2022.101941
Marzieh Khalili , Yildirim Dilek , Leila Zareian Ronizi

The Central Iranian Microcontinent (CIM) in east-central Iran is located north of the active Arabia–Eurasia collision zone. Here, we report on the structure, deformation patterns, and earthquake occurrences along the dextral Lakar–Kuh and Godar fault systems in the CIM. The geometry of these fault systems marks a major restraining bend responsible for surface and rock uplift in the Plio–Pleistocene that produced the Mian Kuh mountain range. The 2017 Hojedk triplet earthquake (Mw = 5.8–6.0) occurred in the Mian Kuh Range. Sentinel–1 A Interferometer Synthetic Aperture Radar (InSAR) images (descending and ascending) were used to extract the coseismic displacements associated with the earthquake and its aftershocks. The results indicate a maximum displacement of ∼20 cm, corresponding to hanging wall uplift along the radar Line-of-Sight (LOS) direction. The Geodetic Bayesian Inversion (GBIS) of the coseismic deformation indicates that the causative faults of the Hojedk earthquakes were two reverse faults with NW–SE–strikes and SW–dips, with minor dextral slip components. Given the focal mechanism solutions and the epicenter locations of the triple earthquake sequence, we infer that these faults at the southern termination of the Lakar–Kuh Fault represent two segments (with different dip angles) of a previously unrecognized, blind reverse fault (a splay of the Godar Fault at depth). The Hojedk Earthquake and the geometry and kinematics of its causative faults highlight the strong potential of seismic hazard zones along the strike-slip fault systems in the CIM.



中文翻译:

伊朗中东部第四纪变形模式,受 2017 年克尔曼省 Hojedk 三重地震同震-震后位移的约束

伊朗中东部的伊朗中部微大陆(CIM)位于活跃的阿拉伯-欧亚大陆碰撞带以北。在这里,我们报告了 CIM 中右旋 Lakar-Kuh 和 Godar 断层系统的结构、变形模式和地震发生情况。这些断层系统的几何形状标志着产生 Mian Kuh 山脉的 Plio-更新世地表和岩石隆起的主要限制弯曲。2017 年 Hojedk 三重地震(Mw = 5.8–6.0)发生在棉库山脉。Sentinel-1 干涉仪合成孔径雷达 (InSAR) 图像(下降和上升)用于提取与地震及其余震相关的同震位移。结果表明最大位移为~20 cm,对应于沿雷达视线(LOS)方向的上盘隆起。同震变形的大地贝叶斯反演(GBIS)表明,Hojedk 地震的成因断层是两个反向断层,具有 NW-SE-走向和 SW-倾角,具有较小的右旋滑动分量。鉴于三重地震序列的震源机制解和震中位置,我们推断这些位于 Lakar-Kuh 断层南端的断层代表了以前未被识别的盲反向断层(一个深度的戈达尔断层)。Hojedk 地震及其成因断层的几何形状和运动学突出了 CIM 中走滑断层系统沿线地震危险区的巨大潜力。同震变形的大地贝叶斯反演(GBIS)表明,Hojedk 地震的成因断层是两个反向断层,具有 NW-SE-走向和 SW-倾角,具有较小的右旋滑动分量。鉴于三重地震序列的震源机制解和震中位置,我们推断这些位于 Lakar-Kuh 断层南端的断层代表了以前未被识别的盲反向断层(一个深度的戈达尔断层)。Hojedk 地震及其成因断层的几何形状和运动学突出了 CIM 中走滑断层系统沿线地震危险区的巨大潜力。同震变形的大地贝叶斯反演(GBIS)表明,Hojedk 地震的成因断层是两个反向断层,具有 NW-SE-走向和 SW-倾角,具有较小的右旋滑动分量。鉴于三重地震序列的震源机制解和震中位置,我们推断这些位于 Lakar-Kuh 断层南端的断层代表了以前未被识别的盲反向断层(一个深度的戈达尔断层)。Hojedk 地震及其成因断层的几何形状和运动学突出了 CIM 中走滑断层系统沿线地震危险区的巨大潜力。带有少量右旋滑动成分。鉴于三重地震序列的震源机制解和震中位置,我们推断这些位于 Lakar-Kuh 断层南端的断层代表了以前未被识别的盲反向断层(一个深度的戈达尔断层)。Hojedk 地震及其成因断层的几何形状和运动学突出了 CIM 中走滑断层系统沿线地震危险区的巨大潜力。带有少量右旋滑动成分。鉴于三重地震序列的震源机制解和震中位置,我们推断这些位于 Lakar-Kuh 断层南端的断层代表了以前未被识别的盲反向断层(一个深度的戈达尔断层)。Hojedk 地震及其成因断层的几何形状和运动学突出了 CIM 中走滑断层系统沿线地震危险区的巨大潜力。盲逆断层(Godar 断层在深处的张开)。Hojedk 地震及其成因断层的几何形状和运动学突出了 CIM 中走滑断层系统沿线地震危险区的巨大潜力。盲逆断层(Godar 断层在深处的张开)。Hojedk 地震及其成因断层的几何形状和运动学突出了 CIM 中走滑断层系统沿线地震危险区的巨大潜力。

更新日期:2022-09-22
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