Cascade processes of induced and triggered earthquakes-Case study in the Weiyuan shale gas development area in Sichuan Basin, China

IF 2.7 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Tectonophysics Pub Date : 2024-09-03 DOI:10.1016/j.tecto.2024.230495
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Abstract

Identifying accurate seismogenic faults is critical for studying the mechanisms of induced earthquakes. On February 24th and 25th, 2019, three moderate earthquakes with magnitudes of MS 4.7, MS 4.3, and MS 4.9 occurred successively in the shale gas development area of Weiyuan, China. We utilized high-resolution three-dimensional (3D) seismic data to identify two pre-existing faults (F1 and F2) that were responsible for the three moderate earthquakes. InSAR data were used to validate the rationality of the two seismogenic faults. Furthermore, we analyzed the impact of fluid diffusion on fault F1 near the fracturing well and calculated the Coulomb failure stress (CFS) generated on fault F2 by the MS 4.7 and MS 4.3 earthquakes to analyze the interactions between these events. The results indicated that fluid diffusion caused by hydrofracturing induced the MS 4.3 and MS 4.7 earthquakes on F1. The static Coulomb stress changes from these two earthquakes subsequently triggered the larger MS 4.9 earthquake on F2. This study provides a case of a cascading process in which induced earthquake events triggered a more distant and higher-magnitude earthquake. This triggering scenario reminds us that earthquake-to-earthquake interactions may be more hazardous than a “typical” inducing mechanism and challenges current risk management practices.

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诱发和触发地震的级联过程--中国四川盆地威远页岩气开发区案例研究
准确识别发震断层对于研究诱发地震的机制至关重要。2019 年 2 月 24 日和 25 日,中国威远页岩气开发区相继发生了三次中度地震,震级分别为 MS4.7、MS4.3 和 MS4.9。我们利用高分辨率三维(3D)地震数据确定了导致这三次中度地震的两个原存断层(F1 和 F2)。我们利用 InSAR 数据验证了这两条地震断层的合理性。此外,我们分析了流体扩散对压裂井附近断层 F1 的影响,并计算了 MS 4.7 和 MS 4.3 地震对断层 F2 产生的库仑破坏应力(CFS),以分析这些事件之间的相互作用。结果表明,水力压裂引起的流体扩散诱发了 F1 上的 MS 4.3 和 MS 4.7 地震。这两次地震引起的静态库仑应力变化随后引发了 F2 上更大的 MS 4.9 地震。这项研究提供了一个级联过程的案例,在这个过程中,诱发地震的事件引发了距离更远、震级更高的地震。这种触发情景提醒我们,地震与地震之间的相互作用可能比 "典型的 "诱发机制更加危险,并对当前的风险管理实践提出了挑战。
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来源期刊
Tectonophysics
Tectonophysics 地学-地球化学与地球物理
CiteScore
4.90
自引率
6.90%
发文量
300
审稿时长
6 months
期刊介绍: The prime focus of Tectonophysics will be high-impact original research and reviews in the fields of kinematics, structure, composition, and dynamics of the solid arth at all scales. Tectonophysics particularly encourages submission of papers based on the integration of a multitude of geophysical, geological, geochemical, geodynamic, and geotectonic methods
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