Tectonophysics最新文献_第2页

Crustal imaging and characterization of active faults with a large-N nodal deployment - Application to the Chaînons Béarnais region (western Pyrenees foothills, France) 利用大 N 节点部署对活动断层进行地壳成像和特征描述--在 Chaînons Béarnais 地区（法国比利牛斯山麓西部）的应用

IF 2.7 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Tectonophysics

Pub Date : 2024-10-18 DOI: 10.1016/j.tecto.2024.230531

Sébastien Chevrot , Matthieu Sylvander , Nicolas Saspiturry , Amine Ourabah , Sébastien Benahmed , Benoît Derode , Frank Grimaud , Jean Letort , Hélène Pauchet , Guy Sénéchal , Antonio Villaseñor , Jean-Baptiste Ammirati

Understanding the driving forces and nature of intraplate seismicity remains a major unsolved problem in seismology. In the western Pyrénées, seismicity is concentrated in a narrow region that follows the boundary between the Axial Zone and the North Pyrenean Zone. Despite the presence of a permanent network in the region, the geometry of active faults, and their relationship with crustal structures, remain elusive, owing to significant earthquake location uncertainties. Here, we exploit data recorded by a large-N nodal array deployed in the Chaînons Béarnais region during four weeks of 2022 in order to image crustal structures and characterize active faults. We automatically detected and picked P and S waves with PhaseNet, resulting in a catalog of over 500 events, half of which are located beneath the temporary deployment. Tomographic images obtained from the inversion of P and S arrival times provide detailed insight into the geometry of folds and thrusts in the sedimentary cover, as well as the presence of a main fault in the basement which dips northward with an angle of 65° (Chaînons Béarnais normal fault). Seismicity relocation within the 3D model obtained by tomography shows that earthquakes are concentrated along this main active fault, extending from the top of the basement to a depth of approximately 16 km. These results demonstrate that passive imaging approaches can offer cost-effective alternatives to traditional controlled source imaging for seismotectonic studies and natural resource exploration in regions with active seismicity.

了解板内地震的驱动力和性质仍然是地震学中一个尚未解决的重大问题。在比利牛斯西部，地震活动集中在轴心带和北比利牛斯带交界处的一个狭窄区域。尽管该地区存在永久性地震网络，但由于地震定位存在很大的不确定性，活动断层的几何形状及其与地壳结构的关系仍然难以确定。在此，我们利用 2022 年四周期间部署在谢农-贝阿尔奈地区的大 N 节点阵列记录的数据，对地壳结构进行成像，并描述活动断层的特征。我们利用PhaseNet自动检测和挑选P波和S波，得到了500多个事件的目录，其中一半位于临时部署的阵列下方。通过反演 P 波和 S 波的到达时间获得的层析成像可以详细了解沉积覆盖层中褶皱和推力的几何形状，以及基底中存在的向北倾 65° 角的主断层（Chaînons Béarnais 正断层）。层析成像法获得的三维模型中的地震活动重新定位显示，地震主要集中在这一主要活动断层沿线，从基底顶部一直延伸到约 16 千米深处。这些结果表明，被动成像方法可替代传统的受控震源成像方法，为地震构造研究和活跃地震地区的自然资源勘探提供具有成本效益的方法。

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引用次数: 0

Insight into intracontinental deformation and crustal reworking of ancient continents implied by crustal structure imaging of the Yangtze Craton 长江克拉通地壳结构成像对古代大陆内部变形和地壳再加工的启示

IF 2.7 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Tectonophysics

Pub Date : 2024-10-18 DOI: 10.1016/j.tecto.2024.230537

Mingming Jiang , Tianyu Zheng , Yumei He

The crustal imprints from multistage tectonic activities in cratons offer valuable insights into continental evolution. Utilizing seismic data from two densely deployed, nearly perpendicular linear arrays, and a newly developed stepwise joint inversion of depth-domain receiver function and surface wave dispersion, we constructed a detailed crustal layering model for the Yangtze Craton. Our analysis revealed elongated double velocity reversal zones as salient features of the crust, which likely record ancient crustal reworking and juvenile crustal growth associated with Neoproterozoic rift-related magmatic processes. The interlayering of low- and high-velocity structures may contribute to the enduring stability of the Yangtze Craton. Additionally, superimposed layers separated by east-dipping interfaces and abrupt changes in crustal thickness in the boundary belts surrounding the Yangtze Craton document the crust's structural responses to intracontinental deformation during continent assembly.

环形山多期构造活动的地壳印记为了解大陆演化提供了宝贵的信息。利用两个密集布设、几乎垂直的线性阵列的地震数据，以及新开发的深域接收函数和面波频散联合逐步反演，我们构建了长江克拉通的详细地壳分层模型。我们的分析揭示了拉长的双速度反转带是地壳的显著特征，它可能记录了与新近纪断裂相关的岩浆过程有关的古代地壳再加工和幼年地壳生长。低速和高速构造的相互叠加可能有助于长江克拉通的持久稳定。此外，长江克拉通周围边界带被东倾界面分隔的叠加层和地壳厚度的突然变化，记录了大陆组装期间地壳对大陆内部变形的结构反应。

引用次数: 0

Structural evolution of the Horoman peridotite complex in conjunction with the formation of the Hidaka Metamorphic Belt, Hokkaido 与北海道日高变质带的形成有关的幌满橄榄岩复合体的构造演化

IF 2.7 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Tectonophysics

Pub Date : 2024-10-18 DOI: 10.1016/j.tecto.2024.230535

Kazuki Matsuyama , Katsuyoshi Michibayashi

We conducted crystal-fabric analyses of peridotites within the Horoman peridotite complex in the Hidaka metamorphic belt, Hokkaido, Japan. Over fifty oriented peridotite samples were collected and analyzed for olivine fabric strength (J-index) and crystallographic preferred orientations (CPOs). The peridotites contained four olivine CPOs: A, E, D, and AG types. We confirmed that olivine CPOs presented a transitional distribution from E to A to AG type from south to north. Previous experimental studies have demonstrated that E type CPO can merge under hydrous conditions. In addition, magnetotelluric observations suggested that the subducting oceanic plate supplies pore fluid to the basal thrust in the region (the Hidaka Main Thrust). Therefore, we infer that the E type CPO was originated from a local water infiltration event. AG type CPO, on the other hand, was considered as a secondary product enhanced by the synkinematic melts in the northern (geological upper) part, combined with the pressure-temperature path inferred by previous petrological studies. Furthermore, we reconstructed the senses of shear strain using the microstructure and olivine crystal-fabrics. Then we built the tectonic history of the Horoman peridotite complex integrating the structural development of the Hidaka metamorphic belt.

我们对日本北海道日高变质带霍罗曼橄榄岩群中的橄榄岩进行了晶体构造分析。我们收集了五十多个取向橄榄岩样本，并对其橄榄石结构强度（J-指数）和晶体学优选取向（CPO）进行了分析。橄榄岩包含四种橄榄石 CPO：A、E、D 和 AG 型。我们证实橄榄石 CPOs 从南到北呈现出从 E 型到 A 型再到 AG 型的过渡分布。之前的实验研究表明，E 型 CPO 在水合条件下可以合并。此外，磁强计观测表明，俯冲的大洋板块为该地区的基底推力（日高主推力）提供了孔隙流体。因此，我们推断 E 型 CPO 起源于当地的水渗透事件。另一方面，AG 型 CPO 被认为是北部（地质上部）同步熔融强化的次生产物，与之前岩石学研究推断的压力-温度路径相结合。此外，我们还利用微观结构和橄榄石晶格重建了剪切应变的感应。然后，我们结合日高变质带的构造发展，构建了霍罗曼橄榄岩群的构造史。

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引用次数: 0

New insight into the velocity and anisotropy structures of the subduction zone in northern Sumatra 对苏门答腊岛北部俯冲带速度和各向异性结构的新认识

IF 2.7 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Tectonophysics

Pub Date : 2024-10-18 DOI: 10.1016/j.tecto.2024.230534

Xueyuan Huang , Ping Tong

In this study, we conducted seismic tomographic inversions to investigate the velocity and anisotropy structures of northern Sumatra, using 9774 P-wave and 8405 S-wave arrivals from regional earthquakes. Isotropic P-wave velocity, isotropic S-wave velocity, P-wave azimuthal anisotropy, and P-wave radial anisotropy models were generated using eikonal equation-based traveltime tomography methods. The study identified low-velocity zones beneath the Toba and Sinabung volcanoes, potentially indicating the presence of magma reservoirs. Furthermore, low-velocity anomalies above the subduction slab were detected, which were likely caused by the dehydration of the slab and interpreted as channels of upwelling flow. The tomographic results revealed a trench-parallel high-velocity belt in the uppermost mantle, representing the subducting slab of the India-Australian plate. The trench-parallel fast velocity directions in the slab suggested that the subducted oceanic slab retains its frozen-in anisotropy formed at the mid-ocean ridge, or that the anisotropy is induced by the lattice-preferred orientation of the B-type olivine. Negative radial anisotropy in the mantle wedge was observed, reflecting hot upwelling flows and transitions of olivine fabrics in the presence of water due to slab dehydration. The results also indicated a multilevel magma plumbing system beneath the Toba Caldera. In summary, the results of this study provided new insights into the structure and dynamic processes of the northern Sumatra subduction zone.

在这项研究中，我们利用来自区域地震的 9774 个 P 波和 8405 个 S 波到达数据进行了地震层析反演，以研究苏门答腊岛北部的速度和各向异性结构。利用基于 eikonal 方程的行进时间层析成像方法生成了各向同性 P 波速度、各向同性 S 波速度、P 波方位各向异性和 P 波径向各向异性模型。研究确定了多巴火山和西那榜火山下方的低速区，这可能表明存在岩浆储层。此外，还探测到俯冲板块上方的低速异常，这可能是板块脱水造成的，被解释为上升流通道。层析成像结果表明，在最上层地幔中有一条沟槽平行高速带，代表印度-澳大利亚板块的俯冲板块。板块中与海沟平行的快速速度方向表明，俯冲的大洋板块保留了在大洋中脊形成的冻结各向异性，或者说该各向异性是由 B 型橄榄石的晶格偏好取向引起的。在地幔楔中观察到了负径向各向异性，反映了板块脱水导致的热上升流和橄榄石结构在有水的情况下的转变。研究结果还表明，鸟羽破火山口下方存在多级岩浆管道系统。总之，这项研究的结果为了解苏门答腊岛北部俯冲带的结构和动态过程提供了新的视角。

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引用次数: 0

Deep plutonic bodies over low-frequency earthquakes revealed from receiver-side Green's functions 从接收方格林函数揭示低频地震上方的深成岩体

IF 2.7 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Tectonophysics

Pub Date : 2024-10-18 DOI: 10.1016/j.tecto.2024.230536

Yasunori Sawaki , Yoshihiro Ito , Emmanuel Soliman M. Garcia , Ayumu Miyakawa , Takuo Shibutani

Seismological heterogeneity in subduction zones provides insights into slow earthquakes and potential megathrust earthquakes. Studies at the Kii Peninsula in the Nankai subduction zone suggest that there are high-density and high-velocity plutonic bodies in the accretionary prism over the subducting slab, potentially influencing megathrust earthquakes. The lateral variation of heterogeneity and the spatial extent of plutonic bodies remain to be investigated well. Our passive-source imaging of receiver-side Green's functions, from widely distributed campaign seismic observations, reveals a sharp negative S-wave velocity contrast on the top surface of the subducting Philippine Sea plate common to all along-dip profiles and a positive phase tilted upward in the forearc crust. The low permeability of the forearc crust prevents the infiltration of slab-dehydrated fluid further into the upper crust. In the western area, we also found positive phases tilted upward in the forearc crust. The negative phase extends towards the deeper extent of slow-earthquake sources. Meanwhile, the positive phase likely represents the top surface of plutonic rocks of the Kumano and Ohmine plutons that span all the way down to the plate interface. Together with observations of gravity anomaly, intraslab seismicity, and seismic tomography, our interpretation supports the presence of plutonic bodies which extend deep beneath the forearc crust as well as laterally over the subducting PHS slab, rather than a serpentinized mantle wedge. The upper plate is generally low in permeability, but areas with localized high permeability may exist on the updip side of tremor sources. This condition, wherein fluid can infiltrate upwards locally, may maintain the relatively less active slow earthquakes in the western area. The lateral variation of the upper-plate lithology likely influences fluid processes and slow earthquake activities.

俯冲带的地震异质性提供了对慢速地震和潜在大地震的洞察力。对南海俯冲带纪伊半岛的研究表明，在俯冲板块上方的增生棱柱中存在高密度和高速度的柱状体，可能对特大推覆地震产生影响。异质性的横向变化和柱状体的空间范围仍有待深入研究。我们从广泛分布的活动地震观测资料中获得的接收方格林函数的被动源成像显示，在俯冲菲律宾海板块的顶面，所有沿倾角剖面都有一个尖锐的负S波速度对比，而在前弧地壳则有一个向上倾斜的正相位。弧前地壳的低渗透性阻止了板块脱水流体进一步渗入上地壳。在西部地区，我们也在前弧地壳中发现了向上倾斜的正相位。负相向慢震源的深部延伸。与此同时，正相位可能代表了熊野和大峰岩浆岩的顶面，一直延伸到板块界面。结合重力异常、板块内地震和地震层析成像的观测结果，我们的解释支持了在前弧地壳深处以及俯冲的 PHS 板块横向上存在着延伸的深成岩体，而不是蛇化的地幔楔。上层板块的渗透率一般较低，但在震源的上升侧可能存在局部渗透率较高的区域。在这种情况下，流体可以在局部向上渗透，这可能会使西部地区的慢地震相对不那么活跃。上盘岩性的横向变化可能会影响流体过程和缓震活动。

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引用次数: 0

Rupture behaviors of the southern Xianshuihe fault and seismicity around Mt. Gongga: Insights from the 2022 MW 6.6 Luding (China) earthquake sequence 咸水河南部断层的断裂行为和贡嘎山附近的地震活动：2022 年中国泸定 6.6 级地震序列的启示

IF 2.7 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Tectonophysics

Pub Date : 2024-10-18 DOI: 10.1016/j.tecto.2024.230538

Wenzheng Gong , Lingling Ye , Shiqing Xu , Yipei Tan , Xiaofei Chen

The 2022 M_W 6.6 Luding earthquake occurred on the Moxi segment of the Xianshuihe fault at the southeast margin of Tibetan Plateau, China. To assess the seismic potential of the Moxi segment, we examine the rupture process of the mainshock and aftershock sequence, along with historical seismicity. Our preferred slip model inverted from teleseismic body waves and regional GNSS static displacements shows a dominant southeastward rupture consisting of two distinct, prominent slip patches along strike extending by ∼15 km, with a peak slip of ∼2.8 m, approximately balancing the slip deficit since the last major earthquake in 1786. The northern section of the Moxi segment experienced minor coseismic slip, which, together with the significant slip deficits and positive Coulomb failure stress change induced by the 2022 mainshock indicates a high seismic potential. Several aftershock clusters are distributed along or near the Moxi segment, with strike-slip focal mechanisms around the downdip edge of the coseismic slip area at ∼8‐12 km. At the eastern flank of Mt. Gongga, another cluster of normal faulting aftershocks is located at shallower depths of ∼3‐7 km, with high seismicity rate over ∼9 months including two other M5 sequences in January and February 2023. Similar intense shallow normal faulting activity had occurred after the impoundment of the nearby Dagangshan reservoir in 2015. We speculate that some NW-SE trending normal faults were initially developed by the gravitational collapse of Mt. Gongga underneath the eastern flank, further weakened by fluid flow, as supported by the existence of hot springs and water impoundment, and reactivated by the tensional stress change induced by the 2022 mainshock. These results have important implications for assessing the seismic hazard in and around the Moxi segment, and the potential interplay between strike-slip fault and nearby mountain areas.

2022 年泸定 6.6 级地震发生在中国青藏高原东南缘咸水河断层墨西段。为了评估磨西段的地震潜力，我们研究了主震和余震序列的断裂过程以及历史地震活动。我们根据远震体波和区域 GNSS 静位移反演的首选滑移模型显示，东南方向的断裂由两个不同的突出滑移斑块组成，沿走向延伸 ∼ 15 千米，滑移峰值为 ∼ 2.8 米，大致平衡了自 1786 年上一次大地震以来的滑移缺口。莫西段北段经历了轻微的同震滑动，加上 2022 年主震引起的显著滑动缺失和库仑破坏应力正变化，表明该地区具有很高的地震潜力。莫西段沿线或附近分布着多个余震群，共震滑动区的下倾边缘∼8-12 千米处有走向滑动焦点机制。在贡嘎山东侧，另一个正断层余震群位于较浅的 3~7 km 处，在 9 个月的时间里地震率较高，其中包括 2023 年 1 月和 2 月的两次 M5 级地震。2015 年附近的大岗山水库蓄水后也发生了类似的强烈浅层正断层活动。我们推测，一些西北-东南走向的正断层最初是由贡嘎山东翼下的重力塌陷形成的，由于存在温泉和蓄水，流体流动进一步削弱了这些断层，2022 年主震引起的张应力变化又重新激活了这些断层。这些结果对于评估墨西段及其周边地区的地震危险以及走向滑动断层与附近山区之间的潜在相互作用具有重要意义。

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引用次数: 0

Fault strength, healing and stability in the Nankai Trough accretionary prism off Kii Peninsula, Japan, as illustrated by friction experiments on gouge of a cored sample 日本纪伊半岛附近南海海槽增生棱柱的断层强度、愈合和稳定性，通过对有芯样本的刨切面进行摩擦实验加以说明

IF 2.7 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Tectonophysics

Pub Date : 2024-10-16 DOI: 10.1016/j.tecto.2024.230526

Kyuichi Kanagawa, Junya Fujimori , Tomoya Nakanishi , Sayumi Sagano , Michiyo Sawai

In order to investigate fault strength, healing and stability in the Nankai Trough accretionary prism off Kii Peninsula, Japan, we conducted two series of triaxial friction experiments on gouge of a silty-claystone sample cored from 2183.6 mbsf (meters below seafloor) at IODP Site C0002, at confining pressure (P_c), pore-water pressure (

P_{H_{2} O}

) and temperature (T) conditions simulating those in situ at 1000–6000 mbsf there; rate-stepping tests at axial displacement rates (V_axial) changed stepwise among 0.1, 1 and 10 μm/s, and slide-hold-slide tests at V_axial = 1 μm/s with hold time (t_h) ranging from 10 to 10⁴ s.

Experimentally determined steady-state and static friction coefficients, μ_ss and μ_s, respectively, and the log-linear t_h dependence of frictional healing, β, exhibit a decrease with simulated depth down to 3000 mbsf at which condition T was 100 °C, followed by an increase toward 6000 mbsf. On the other hand, the rate dependence of μ_ss, a – b, gradually decreases with simulated depth, changing from positive at ≤4000 mbsf through ∼0 at 5000 mbsf to negative at 6000 mbsf at which condition stick slips were observed.

Our experimental results suggest the presence of a low fault-strength and weak fault-healing zone at ∼3000 mbsf beneath IODP Site C0002, possibly due to elevated pore pressure induced by smectite dehydration. This zone correlates well with the previously reported low seismic-velocity zone and the source area of very low-frequency earthquakes to the south. Our experimental results also suggest that faulting beneath IODP Site C0002 is stable and aseismic at ≤4000 mbsf, transitional at 5000 mbsf, and potentially unstable and seismic at 6000 mbsf. In fact, stick slips corresponding to seismic faulting were observed at the 6000 mbsf condition. This implies that faulting along the plate-boundary thrust located at ∼5200 mbsf beneath IODP Site C0002 is potentially seismogenic.

为了研究日本纪伊半岛附近南海海槽增生棱柱的断层强度、愈合和稳定性，我们在 IODP C0002 号站点对 2183.我们在 IODP 站点 C0002 的 6 mbsf（海底以下米）处，在约束压力（Pc）、孔隙水压力（PH2O）和温度（T）条件下，模拟了该处 1000-6000 mbsf 的原位条件；在轴向位移率（Vaxial）在 0、1、1 和 10 μm 之间逐步变化的情况下，进行了速率步进试验。实验测定的稳态和静态摩擦系数（分别为μss和μs）以及摩擦愈合的对数线性th依赖性（β）显示，随着模拟深度下降到3000 mbsf，温度（T）为100 °C，随后在6000 mbsf上升。另一方面，μss（a - b）的速率随模拟深度逐渐减小，从≤4000 mbsf处的正（0）到5000 mbsf处的正（0），再到6000 mbsf处的负（6000 mbsf处观察到条件粘滑）。该区域与之前报告的低震速区和南部极低频地震的震源区密切相关。我们的实验结果还表明，IODP C0002站点下的断层在≤4000 mbsf处是稳定的非地震断层，在5000 mbsf处是过渡断层，在6000 mbsf处可能是不稳定的地震断层。事实上，在 6000 mbsf 条件下观测到了与地震断层相对应的棍状滑动。这意味着，位于IODP C0002站点地下5200 mbsf的板块边界推力断层可能是地震断层。

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引用次数: 0

Tectonics of the Mw 6.8 Al Haouz earthquake (Morocco) reveals minor role of asthenospheric upwelling 6.8 级 Al Haouz 地震（摩洛哥）的构造揭示了星体层上升流的次要作用

IF 2.7 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Tectonophysics

Pub Date : 2024-10-11 DOI: 10.1016/j.tecto.2024.230533

Marco G. Malusà , Alessandro Ellero , Giuseppe Ottria

A reliable identification of the fault responsible for the magnitude 6.8 Al Haouz earthquake that struck Morocco on 8 September 2023 has so far been hampered by a lack of accurate tectonic analyses. Here we provide the first updated tectonic framework of the earthquake epicentral area based on original field data. We cast our results into the context of available geomorphological, thermochronological and geophysical constraints, and discuss the earthquake characteristics within the framework of competing tectonic models either based on asthenospheric upwelling or transpressional tectonics. We found that the Al Haouz earthquake was likely generated by rupture along a north-dipping high-angle fault, linking former fault planes belonging to an orogen-scale WSW-ESE transpressional shear zone. The geological evolution and seismotectonic structure of the region are largely governed by the oblique convergence of tectonic plates. The impact of asthenospheric upwelling, if any, remains limited and may only influence the geomorphological evolution of the Western High Atlas, but cannot explain the seismotectonic and geological features observed today at the surface, which are instead effects of transpressional tectonics.

2023 年 9 月 8 日，摩洛哥发生了 6.8 级豪兹地震，迄今为止，由于缺乏准确的构造分析，无法可靠地确定造成此次地震的断层。在此，我们基于原始的实地数据，首次提供了地震震中地区的最新构造框架。我们将研究结果与现有的地貌学、热时学和地球物理学制约因素相结合，并在基于星体层上升流或转位构造的相互竞争的构造模型框架内讨论了地震特征。我们发现，Al Haouz 地震很可能是沿着北倾高角断层发生的断裂，该断层将属于造山带尺度的 WSW-ESE 换压剪切带的前断层面连接起来。该地区的地质演变和地震构造结构在很大程度上受构造板块斜向聚合的影响。星体层上升流的影响（如果有的话）仍然有限，可能只会影响西高阿特拉斯的地貌演变，但无法解释今天在地表观察到的地震构造和地质特征，这些特征是换位构造的影响。

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引用次数: 0

Shale gas leakage and fault activation: Insight from the 2021 Luxian MS 6.0 earthquake, China 页岩气泄漏与断层激活：2021 年中国泸县 MS 6.0 级地震的启示

IF 2.7 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Tectonophysics

Pub Date : 2024-10-11 DOI: 10.1016/j.tecto.2024.230530

Zhaofei Liu , Zhi Chen , Ying Li , Zhidan Zhao , Shunying Hong , Le Hu , Ling Ma , Chang Lu , Yuanxin Zhao , Hongyi He , Shujuan Su , Ying Zhao , Weiye Shao , Zhengyang Cao , Hanyu Wang

In the region of large gas fields, extensive research has been conducted on earthquakes induced by industrial production in shale gas fields. However, limited attention has been given to the impact of post-earthquake events on shale gas reservoir leakage and fault activation. The Luxian M_S 6.0 earthquake, which occurred on 16 September 2021 in the Luzhou shale gas field, has raised concerns about post-earthquake shale gas leakage. Post-earthquake measurements of soil gases (Rn, CO₂, CH₄, and H₂) and isotopic analyses (δ¹³C_CO2, δ¹³C_CH4 and δD_CH4) in the Luzhou shale gas field area reveal that the Huayingshan fault zone, a natural pathway for shale gas leakage, was not activated by the Luxian earthquake and did not exhibit any further shale gas leakage after the 2021 earthquake. Furthermore, the seismogenic fault, which was impacted by the earthquake, did not damage the shale gas reservoir, causing shale gas leakage. This study provides an important foundation for future research on shale gas extraction and seismic activity in the region.

在大型气田地区，人们对页岩气田工业生产引发的地震进行了广泛研究。然而，人们对震后事件对页岩气储层泄漏和断层活化的影响关注有限。2021 年 9 月 16 日在泸州页岩气田发生的泸县 MS 6.0 级地震引起了人们对震后页岩气泄漏的关注。震后在泸州页岩气田地区进行的土壤气体（Rn、CO2、CH4 和 H2）测量和同位素分析（δ13CCO2、δ13CCH4 和 δDCH4）显示，作为页岩气泄漏天然通道的华应山断裂带并未被泸县地震激活，在 2021 年地震后也未出现页岩气进一步泄漏。此外，受地震影响的发震断层也没有破坏页岩气储层，造成页岩气泄漏。这项研究为今后研究该地区页岩气开采和地震活动提供了重要依据。

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引用次数: 0

A numerical study of contemporary crustal deformation partitioning across the Southwestern Tian Shan orogen 天山西南造山带当代地壳变形分区数值研究

IF 2.7 3区地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS

Tectonophysics

Pub Date : 2024-10-11 DOI: 10.1016/j.tecto.2024.230529

Weilin Kong , Luyuan Huang , Yebo Li , Yiwei Tian

The Tian Shan region is a typical example of crustal deformation within an intracontinental environment, where the lithospheric rheological properties are marked by significant spatial heterogeneity. However, the role of lithospheric rheology in crustal strain partitioning within the interior of the Tian Shan orogenic belt remains nebulous. Here, we utilized a two-dimensional viscoplastic model with contact elements constrained by GPS velocities and fault slip rates to investigate the influence of the block's strength on crustal deformation in the southwestern Tian Shan region. Our founding suggests that a weaker lower crust beneath the northern Tian Shan region offers a potential mechanism for the contemporary deformation patterns. Contemporary crustal deformation at Tian Shan is mainly concentrated along the piedmont thrust-and-fold belts and diffuses in the orogen's interior. This pattern of crustal strain partitioning is closely linked to the interplay between fault slips and lithospheric deformation. This finding emphasizes the significant role that the lithospheric rheology and pre-existing faults played in the deformation partitioning in the interior of the Tian Shan orogeny.

天山地区是大陆内部环境中地壳变形的一个典型例子，其岩石圈流变特性具有显著的空间异质性。然而，岩石圈流变学在天山造山带内部地壳应变分区中的作用仍然模糊不清。在此，我们利用一个二维粘塑性模型，在全球定位系统速度和断层滑动率的约束下，利用接触元素研究了块体强度对天山西南部地区地壳变形的影响。我们的研究结果表明，天山北部地壳下部较弱的地壳为当代变形模式提供了一个潜在的机制。天山当代地壳变形主要集中在山前推覆带，并向造山带内部扩散。这种地壳应变分区模式与断层滑动和岩石圈变形之间的相互作用密切相关。这一发现强调了岩石圈流变和原有断层在天山造山带内部变形分区中的重要作用。

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