Earthquake Research Advances最新文献

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Earthquake Research Advances

Pub Date : 2025-01-01

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Earthquake Research Advances

Pub Date : 2025-01-01

引用次数: 0

The representative scientific results of the China Seismo-Electromagnetic Satellite 中国地震电磁卫星的代表性科学成果

Earthquake Research Advances

Pub Date : 2025-01-01 DOI: 10.1016/j.eqrea.2024.100314

Zhima Zeren, Yanyan Yang, Rui Yan, Zhenxia Zhang, Jie Wang, He Huang, Song Xu, Hengxin Lu, Na Zhou, Jianping Huang

The China Seismo-Electromagnetic Satellite (CSES-01) launched on February 2, 2018, has been steadily operating in orbit for more than six years, exceeding its designed five-year lifespan expectation. The evaluation results suggest that the satellite platform and the majority of payloads are performing well, and still providing reliable measurements. This report briefly introduces the representative scientific results obtained from CSES-01's five-year observations. The first result is the long-term global geophysical field data accumulated for the first time, including the global geomagnetic field, the electromagnetic field and waves in a broad frequency band, the in-situ and profile ionospheric plasma parameters, and the energetic particles. The second result is that a series of data processing and validation methods were obtained, and some of the methods are unique worldwide. The third result is that the geomagnetic field, lithospheric magnetic field, and ionospheric electron density 3D models were built based on CSES-01’ s data. The fourth result is that statistical features of seismic-ionospheric disturbances were revealed and the direct observational evidence for the electromagnetic wave propagation models in the lithosphere-atmosphere-ionosphere was also confirmed. The fifth result is the physical processing of the space weather events was clearly described, showing CSES-01's good capability of monitoring space weather conditions.

中国地震电磁卫星（ses -01）于2018年2月2日发射升空，已在轨道上稳定运行了6年多，超过了5年的设计寿命预期。评估结果表明，卫星平台和大部分有效载荷性能良好，仍然提供可靠的测量。本报告简要介绍了ses -01 5年观测取得的具有代表性的科学成果。第一个结果是首次积累的长期全球地球物理场数据，包括全球地磁场、电磁场和宽频带波、原位和剖面电离层等离子体参数以及高能粒子。第二个结果是获得了一系列数据处理和验证方法，其中一些方法在世界范围内是独一无二的。第三个结果是基于ses -01数据建立了地磁场、岩石圈磁场和电离层电子密度三维模型。第四，揭示了地震-电离层扰动的统计特征，也证实了岩石圈-大气-电离层电磁波传播模型的直接观测证据。五是清晰地描述了空间天气事件的物理处理过程，显示了ses -01良好的空间天气监测能力。

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引用次数: 0

Assessment of seismic spatiotemporal characteristics and migration distance in the Badong section of the Three Gorges Reservoir Area 三峡库区巴东段地震时空特征及迁移距离评价

Earthquake Research Advances

Pub Date : 2025-01-01 DOI: 10.1016/j.eqrea.2024.100316

Guoyong Duan , Fei Li , Kongwei Wang , Yaobo Xu

This paper aims to elucidate the seismic characteristics of the Three Gorges Reservoir area after impoundment and investigate the seismic source migration. Based on the seismic data analysis from the Badong segment in the Three Gorges Reservoir area, we assessed the local temporal and spatial variations in the frequent earthquakes. Correlation analysis was conducted to investigate the relationship between changes in reservoir water levels and the occurrence of reservoir-induced earthquakes. Additionally, we examined the regularity of earthquake occurrences at the exact location during different periods. Based on the fault mechanics principles, a formula was derived to estimate the length of open and wing-shaped rupture at the hypocenter under the influence of pore or excess pore water pressure. The results reveal that reservoir-induced seismicity demonstrates short-term cycles characterized by alternating "active periods" and "quiet periods," as well as long-term cycles with the combined periods. The probability of earthquakes occurring within one year at the epicentre is relatively high and decreases after four years. The derived formula can be utilized to estimate the seismic migration distance at the epicentre in the short term. These research findings provide valuable insights for analyzing the regularity of reservoir-induced earthquake activities and understanding the mechanism of seismic source migration.

本文旨在阐明三峡库区蓄水后的地震特征，探讨震源迁移。通过对三峡库区巴东段地震资料的分析，评价了该地区地震频发的时空变化特征。对水库水位变化与水库诱发地震的关系进行了相关分析。此外，我们还研究了不同时期在同一地点发生地震的规律。根据断裂力学原理，导出了在孔隙或超孔隙水压力作用下震源处开孔破裂和翼状破裂长度的估算公式。结果表明，水库诱发的地震活动表现出以“活跃期”和“安静期”交替为特征的短期周期，以及以组合周期为特征的长期周期。震中一年内发生地震的概率相对较高，四年后发生地震的概率降低。推导出的公式可以在短期内估计地震在震中的偏移距离。这些研究成果为分析水库诱发地震活动规律和认识震源运移机制提供了有价值的见解。

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引用次数: 0

Earthquake Research Advances

Pub Date : 2025-01-01

引用次数: 0

Earthquake Research Advances

Pub Date : 2025-01-01

引用次数: 0

The evolution process between the earthquake swarm beneath the Noto Peninsula, central Japan and the 2024 M 7.6 Noto Hanto earthquake sequence 日本中部诺藤半岛地震群与2024年7.6级诺藤阪神地震序列的演化过程

Earthquake Research Advances

Pub Date : 2025-01-01 DOI: 10.1016/j.eqrea.2024.100332

Zhigang Peng , Xinglin Lei , Qing-Yu Wang , Dun Wang , Phuc Mach , Dongdong Yao , Aitaro Kato , Kazushige Obara , Michel Campillo

Several physical mechanisms of earthquake nucleation, such as pre-slip, cascade triggering, aseismic slip, and fluid-driven models, have been proposed. However, it is still not clear which model plays the most important role in driving foreshocks and mainshock nucleation for given cases. In this study, we focus on the relationship between an intensive earthquake swarm that started beneath the Noto Peninsula in Central Japan since November 2020 and the nucleation of the 2024 M 7.6 Noto Hanto earthquake. We relocate earthquakes listed in the standard Japan Meteorological Agency (JMA) catalog since 2018 with the double-different relocation method. Relocated seismicity revealed that the 2024 M 7.6 mainshock likely ruptured a thrust fault above a parallel fault where the M 6.5 Suzu earthquake occurred in May 2023. We find possible along-strike and along-dip expansion of seismicity in the first few months at the beginning of the swarm sequence, while no obvious migration pattern in the last few days before the M 7.6 mainshock was observed. Several smaller events occurred in between the M 5.5 and M 4.6 foreshocks that occurred about 4 min and 2 min before the M7.6 mainshock. The Coulomb stress changes from the M 5.5 foreshock were negative at the hypocenter of the M 7.6 mainshock, which is inconsistent with a simple cascade triggering model. Moreover, an M 5.9 foreshock was identified in the JMA catalog 14 s before the mainshock. Results from back-projection of high-frequency teleseismic P waves show a prolonged initial rupture process near the mainshock hypocenter lasting for ∼25 s, before propagating bi-laterally outward. Our results suggest a complex evolution process linking the earthquake swarm to the nucleation of the M 7.6 mainshock at a region of complex structures associated with the bend of a mapped large-scale reverse fault. A combination of fluid migration, aseismic slip and elastic stress triggering likely work in concert to drive both the prolonged earthquake swarm and the nucleation of the M7.6 mainshock.

提出了地震成核的几种物理机制，如预滑动、级联触发、地震滑动和流体驱动模型。然而，对于给定的情况，哪一种模式在驱动前震和主震成核中起最重要的作用仍不清楚。在这项研究中，我们重点研究了自2020年11月以来在日本中部的诺托半岛下方开始的强烈地震群与2024年7.6级诺托汉托地震的成核之间的关系。我们对2018年以来日本气象厅（JMA）标准目录中列出的地震进行了双重不同的重新定位方法。重新定位的地震活动显示，2024年的7.6级主震可能在2023年5月发生6.5级苏州地震的平行断层上方破裂了一个逆冲断层。在震群序列开始的前几个月，地震活动性可能沿走向和沿倾角扩展，而在7.6级主震发生前的最后几天，地震活动性没有明显的迁移模式。在里氏5.5级和里氏4.6级前震之间发生了几次较小的地震，发生在里氏7.6级主震前约4分钟和2分钟。在7.6级主震震源处，5.5级前震库仑应力变化为负，与简单的级联触发模型不一致。此外，日本气象厅在主震发生前14秒目录中确定了5.9级前震。高频远震P波的反投影结果显示，主震震源附近的初始破裂过程持续约25秒，然后向两侧向外传播。我们的研究结果表明，地震群与7.6级主震的成核有一个复杂的演化过程，该区域的复杂结构与已绘制的大型逆断层的弯曲有关。流体迁移、地震滑动和弹性应力触发的组合可能共同推动了长时间的地震群和7.6级主震的成核。

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Earthquake Research Advances

Pub Date : 2025-01-01

引用次数: 0

Geophysical delineation of the newly identified Gulmarg fault in the Kashmir Basin, NW Himalaya. Implications for active structural control 喜马拉雅西北部克什米尔盆地新发现的Gulmarg断层的地球物理圈定。对主动构造控制的启示

Earthquake Research Advances

Pub Date : 2025-01-01 DOI: 10.1016/j.eqrea.2024.100315

Ayaz Mohmood Dar, Syed Kaiser Bukhari

The Kashmir Basin, shaped by the collision of the Indian and Eurasian tectonic plates, features prominent faults, including the Balapur fault and other fault zones. This study focuses on the Gulmarg fault within the Northwestern Himalaya, using advanced geomagnetic techniques for delineation. Geomagnetic measurements reveal the characteristics of the newly identified Gulmarg fault. Ground magnetic surveys with Proton Precession Magnetometers along linear profiles and a magnetic grid highlight fault-related anomalies. The results indicate a fault running through the Gulmarg meadows, approximately 1.6 km from the Balapur fault, suggesting a potential coupling between the two. Three profiles across the fault exhibit distinctive magnetic variations, highlighting the intricate nature of the fault structure. Gridding methods also reveal anomalies associated with subsurface water and hydraulic activities, underscoring the importance of advanced geophysical techniques. This study emphasizes the significance of detailed investigations to unravel the complex geological processes shaping the Kashmir Basin. The study provides valuable insights into the tectonic activity in the Gulmarg region, underscoring the role of geophysical studies in enhancing our understanding of dynamic geological structures like the Gulmarg fault zone.

克什米尔盆地是由印度和欧亚构造板块碰撞形成的，具有突出的断层，包括巴拉普尔断层和其他断裂带。本研究以喜马拉雅西北部的Gulmarg断层为研究对象，采用先进的地磁技术进行圈定。地磁测量揭示了新发现的Gulmarg断层的特征。利用质子进动磁力计沿线性剖面和磁网格进行地面磁测量，突出与断层有关的异常。结果表明，一条断层穿过Gulmarg草甸，距离Balapur断层约1.6公里，这表明两者之间存在潜在的耦合。断层上的三条剖面显示出独特的磁变化，突出了断层结构的复杂性。网格方法还揭示了与地下水和水力活动相关的异常，强调了先进的地球物理技术的重要性。本研究强调了详细调查对揭示形成克什米尔盆地的复杂地质过程的重要性。这项研究为Gulmarg地区的构造活动提供了有价值的见解，强调了地球物理研究在增强我们对Gulmarg断裂带等动态地质结构的理解方面的作用。

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Earthquake Research Advances

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