2008 年 6.6 级努拉地震的地表断裂:帕米尔-天山碰撞带触发的挠性-滑动断层

IF 3.3 1区 地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS
Tectonics Pub Date : 2024-09-05 DOI:10.1029/2024tc008360
M. Patyniak, A. Landgraf, A. Dzhumabaeva, S. Baikulov, A. M. Williams, F. Preusser, K. E. Abdrakhmatov, J R. Arrowsmith, M. R. Strecker
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引用次数: 0

摘要

本研究调查了在中亚天山南部和帕米尔山脉北部大陆碰撞带活动断层的复杂构造环境中,地震源和震源地表破裂之间错综复杂的关系。研究重点是 2008 年沿帕米尔正面推力发生的 Mw 6.6 Nura 地震,在这次地震中,震源地表破裂意外地发生在距震源推力断层 10 公里以外的山麓壁上。这一差异提出了地震破裂时构造结构之间的相互作用和潜在触发机制的问题。我们的调查利用无人机摄影和实地考察,将详细的断层带测绘与构造地貌观测相结合,以揭示地下结构与地表变形现象之间的潜在相互作用。我们的研究结果表明,沿深层基底断层的滑动和在古近纪褶皱地层中远程触发的挠曲滑动共同导致了上覆第四纪冰川沉积的地表断裂。地貌学和地质年代学分析以及系统位移测量进一步揭示了该地区断层系统过去发生过类似断裂的证据,表明其重现间隔为 1.7 千年,全新世垂直偏移速率为 0.4 毫米/年。对努拉断裂带的分析大大有助于评估地表和地下结构在断裂带行为和地震灾害评估方面的联系。重要的是,我们的研究结果强调了在地表断裂不明确的地区进行现场调查的关键作用,在这些地区,误读可能会导致低估地震事件的影响,并限制对地震历史和应变累积的评估。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Surface Rupture of the 2008 Mw 6.6 Nura Earthquake: Triggered Flexural-Slip Faulting in the Pamir-Tien Shan Collision Zone
This study investigates the intricate relationship between earthquake sources and seismogenic surface ruptures in a complex tectonic setting with active faults in the continental collision zone between the southern Tien Shan and the northern Pamir Mountains in Central Asia. The study focuses on the 2008 Mw 6.6 Nura earthquake along the Pamir Frontal Thrust, where the seismogenic surface rupture occurred unexpectedly within the footwall and 10 km away from the source thrust fault. This discrepancy raises questions about the interactions and potential trigger mechanisms between tectonic structures during earthquake rupture. Using unmanned aerial vehicle photography and field inspection, our investigation integrates detailed fault-zone mapping with tectono-geomorphic observations to unravel potential interactions between subsurface structures and surface-deformation phenomena. Our findings suggest that a combination of slip along deep-seated basement faults and remotely triggered flexural slip within folded Paleogene strata led to surface rupture of overlying Quaternary glacial deposits. Geomorphological and geochronological analyses coupled with systematic displacement measurements furthermore reveal evidence of similar past ruptures within the regional fault system, suggesting a recurrence interval of 1.7 kyr and a Holocene vertical offset rate of 0.4 mm/yr. The analysis of the Nura rupture zone contributes significantly to evaluate linkages between surface and subsurface structures regarding fault-zone behavior and seismic hazard assessments. Importantly, our results highlight the critical role of on-site investigations in regions with poorly defined surface ruptures, where misinterpretation may lead to the underestimation of the impact of seismic events and limitations in assessing earthquake history and strain accumulation.
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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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