Kinematic and dynamic fault slip analyses: Implications from the surface rupture of the 2023 Elbistan (Kahramanmaraş) (Mw7.6) earthquake, Türkiye

IF 2.6 2区 地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY Journal of Structural Geology Pub Date : 2024-08-14 DOI:10.1016/j.jsg.2024.105235
Mehmet Köküm
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Abstract

On 6 February 2023, the Elbistan (Kahramanmaraş) (Mw7.6) earthquake produced a strike-slip type coseismic surface rupture zone, involving the sinistral slip of the Doğanşehir Fault (DF) and Çardak Fault (ÇF). Fault slickenlines and seismic slickenlines were included in the inversion as part of the dynamic analysis. The inversion of fault slickenlines collected from nine outcrops along the surface rupture following the earthquake, many of which developed during the event and are referred to as coseismic slickenlines, reveals a strike-slip stress regime (σ2 = σv) characterized by a NE-SW (mean azimuth: N045°E) σ1 (maximum) axis. Relict slip planes adjacent to main slip surfaces were found to host slickenlines that appear much older than the most recent earthquake, referred to as paleoslip slickenlines. Inversion of the paleoslip slickenline collected from four outcrops reveals an extensional stress regime (σ1 = σv) characterized by a NE-SW σ3 (min) axis, consistent with previously published studies. To define a significant stress tensor concerning present-day faulting within the investigated area, the inversion method was applied to the seismic slickenlines of shallow earthquakes in the surface rupture area. The inversion of sixty selected nodal planes reveals a strike-slip stress regime (σ2 = σv) characterized by an NNE–SSW (N10°E) σ1 (max) axis. Besides, the moment tensor summation analysis using displacement vectors inferred from visible field markers offset during the earthquake was applied to the seismic slickenlines as part of the kinematic analysis. The shortening and extension results for the moment tensor summation are 044/36 and 307/11 indicating NE-SW compression. Results of the moment tensor summation (weighted by fault displacement) agree broadly with the inversion of seismic slickenlines results, indicating an NE orientation for shortening and an SE orientation for extension.

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运动学和动态断层滑动分析:2023 年土耳其埃尔比斯坦(卡赫拉曼马拉什)(Mw7.6)地震地表断裂的影响
2023 年 2 月 6 日,埃尔比斯坦(卡赫拉曼马拉什)(Mw7.6)地震产生了一个走向滑动型共震地表断裂带,涉及多安谢尔断层(DF)和恰尔达克断层(ÇF)的正弦滑动。作为动态分析的一部分,断层倾斜线和地震倾斜线被纳入反演中。从地震后地表断裂沿线的九个露头采集的断层滑动线(其中许多在地震期间形成,被称为共震滑动线)的反演结果显示了以东北-西南(平均方位角:N045°E)σ1(最大值)轴为特征的走向-滑动应力机制(σ2 = σv)。在主滑动面附近的相对滑动面上发现了比最近一次地震要早得多的加厚线,被称为古滑动加厚线。对从四个露头采集的古滑坡加厚线进行反演,发现了以东北-西南σ3(最小)轴为特征的伸展应力机制(σ1 = σv),这与之前发表的研究结果一致。为了确定与调查区域内现今断层有关的重要应力张量,对地表破裂区域浅层地震的地震斜线采用了反演方法。对所选的 60 个节点平面进行反演,发现了一个以 NNE-SSW(N10°E)σ1(最大值)轴为特征的走向滑动应力机制(σ2 = σv)。此外,作为运动学分析的一部分,利用从地震期间偏移的可见场标推断出的位移向量,对地震斜线进行了力矩张量求和分析。力矩张量求和的缩短和延伸结果分别为 044/36 和 307/11,表明为东北-西南压缩。力矩张量求和结果(按断层位移加权)与地震斜线反演结果基本一致,表明缩短方向为东北,延伸方向为东南。
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来源期刊
Journal of Structural Geology
Journal of Structural Geology 地学-地球科学综合
CiteScore
6.00
自引率
19.40%
发文量
192
审稿时长
15.7 weeks
期刊介绍: The Journal of Structural Geology publishes process-oriented investigations about structural geology using appropriate combinations of analog and digital field data, seismic reflection data, satellite-derived data, geometric analysis, kinematic analysis, laboratory experiments, computer visualizations, and analogue or numerical modelling on all scales. Contributions are encouraged to draw perspectives from rheology, rock mechanics, geophysics,metamorphism, sedimentology, petroleum geology, economic geology, geodynamics, planetary geology, tectonics and neotectonics to provide a more powerful understanding of deformation processes and systems. Given the visual nature of the discipline, supplementary materials that portray the data and analysis in 3-D or quasi 3-D manners, including the use of videos, and/or graphical abstracts can significantly strengthen the impact of contributions.
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