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Stability Analysis of Fragile Rock Pillars and Insights on Fault Activity in the Negev, Israel
Journal of Geophysical Research: Solid Earth ( IF 3.9 ) Pub Date : 2020-11-20 , DOI: 10.1029/2019jb019269
Yaron Finzi 1 , Noam Ganz 1, 2 , Ory Dor 3 , Michael Davis 4 , Omri Volk 2 , Sebastian Langer 5 , Ramon Arrowsmith 6 , Michael Tsesarsky 2
Affiliation  

Fragile geologic features (FGFs) are used as negative indicators of strong ground motion. By evaluating the stability of FGFs and determining their age, it is possible to constrain the local maximum seismic ground acceleration that has occurred during their lifetime. This methodology was originally developed to analyze precariously balanced rocks (a subset of FGFs) and has been used to assess long‐term fault activity and improve seismic hazard analyses. In the Negev desert of Israel, several in situ, slender rock pillars exhibit natural frequencies within the range of seismic waves (1–10 Hz) and therefore constitute an important FGF subset. However, the motion of such pillars may be complex with an initial stage of swaying followed by basal detachment, rocking and toppling, or failure within the pillar. To demonstrate that pillar stability can be analyzed using the existing FGF methodology, we show that the tensional stresses developed at the base of a pillar swaying at its fundamental modes of motion are comparable or larger than the typical tensile strength of Negev pillars. Finally, we demonstrate how a newly documented data set of Negev FGFs can be used to provide new insights on fault activity along the Negev‐Sinai Shear Zone and the Arava Fault. Assuming a plausible range of motion amplification, the stability analysis of long‐standing FGFs yields significant constraints on fault seismicity parameters (Mmax < 7 for a section of the Arava Fault). Extending the regional data set would provide important insights for regional seismic hazard along the Dead Sea Transform.

中文翻译:

以色列内盖夫脆弱岩柱的稳定性分析和断裂活动的见解

脆弱的地质特征(FGFs)被用作强地面运动的负面指标。通过评估FGF的稳定性并确定其年龄,可以限制FGF在其生命周期内发生的局部最大地震地面加速度。该方法最初是用来分析不稳定平衡的岩石(FGFs的一个子集),并已用于评估长期断层活动和改进地震危险性分析。在以色列的内盖夫沙漠中,几根细长的原石柱在地震波范围内(1-10 Hz)表现出固有频率,因此构成了重要的FGF子集。但是,这种支柱的运动可能很复杂,在初始摇摆阶段之后是基础脱离,摇摆和倾覆,或者支柱内部发生故障。为了证明可以使用现有的FGF方法分析支柱的稳定性,我们证明了在支柱的基础运动模式下摇摆的支柱基础上产生的拉应力与Negev支柱的典型拉伸强度相当或更大。最后,我们演示了如何使用新记录的Negev FGFs数据集提供有关Negev-Sinai剪切带和Arava断层沿断层活动的新见解。假设运动放大范围合理,对长期存在的FGF进行稳定性分析会对断层地震参数产生重大限制(我们演示了如何使用新记录的Negev FGFs数据集提供有关Negev-Sinai剪切带和Arava断层沿断层活动的新见解。假设运动放大范围合理,对长期存在的FGF进行稳定性分析会对断层地震参数产生重大限制(我们演示了如何使用新记录的Negev FGFs数据集提供有关Negev-Sinai剪切带和Arava断层沿断层活动的新见解。假设运动放大范围合理,对长期存在的FGF进行稳定性分析会对断层地震参数产生重大限制( 对于Arava故障的一部分,M max <7)。扩展区域数据集将为沿死海变换的区域地震灾害提供重要的见解。
更新日期:2020-12-08
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