Results 51 to 60 of about 778,631 (106)
Geophysical Research Letters, Volume 52, Issue 19, 16 October 2025.Abstract Fine‐grained gouge found in fault cores controls earthquake generation through its frictional behavior and microstructural evolution. Here we present friction experiments on natural granitic gouges of various initial grain sizes at hydrothermal conditions.
Huiru Lei +4 more
wiley +1 more source
Ecology and Evolution, Volume 15, Issue 9, September 2025.Identifying and quantifying natural and anthropogenic disturbances at fine spatial scales is critical to assess the role of forests in climate change mitigation. Using tree rings, fire scars, satellite imagery, official records, and interviews, we reconstructed historical disturbances and identified fires, logging events, landslides, and icy ...
Zhongqian Cheng +3 more
wiley +1 more source
Dizhen xuebao2023年12月18日甘肃积石山发生了MS6.2地震，本文基于中国数字强震动台网和地震预警网相关台站捕获到此次地震的强震动加速度记录，对地震动峰值空间分布特征、方向性效应、上下盘特性及反应谱特性进行了分析，结果表明：此次地震的强地震动空间分布主要受发震断层展布的控制；近断层附近，破裂方向效应明显；上下盘特性显著影响了强地震动等值线分布；相较于基岩场地，土层场地加速度反应谱在低频段显著放大。此外，此次地震震中的地震动强度已显著超越了现行抗震设计规范中罕遇、极罕遇地震水平。
Xueliang Duan +8 more
doaj +1 more source
Joint Extraction Method for Spatial Relations in Chinese Geological Texts
Earth and Space Science, Volume 12, Issue 8, August 2025.Abstract Extracting spatial relations of geological entities is an important prerequisite for achieving natural language processing tasks such as geological knowledge question answering and semantic search, and is an important means to achieve structural reconstruction of unstructured geological data.
Chuan Chen +9 more
wiley +1 more source
Magmatic System of the Hainan Plume Revealed by Ambient Noise Tomography
Journal of Geophysical Research: Solid Earth, Volume 130, Issue 7, July 2025.Abstract The magmatic system of the Hainan plume is important for unraveling the mechanism of intraplate volcanism. We develop a detailed three‐dimensional shear‐wave velocity (Vs) model of the crust and uppermost mantle using ambient noise tomography to investigate the magmatic system of the Hainan plume. Rayleigh wave phase velocity dispersions (5–40
Gong Deng +3 more
wiley +1 more source
Dizhen xuebao为揭示2024年1月1日日本能登半岛MW7.6地震的破裂过程，本文综合多机构及学者的震源机制数据，获取了此次地震的震源机制中心解的两个节面参数，通过分析震后24小时内地震序列中余震深度的分布，确定倾向东南的节面更适合作为此次地震的发震断层面。选取全球地震台网（GSN）在震中30°—90°范围内的35个台站的宽频带地震P波波形数据，利用地震破裂过程波形反演方法，试错得到该地震的破裂过程。结果显示此次地震破裂存在如下基本特征：① 破裂持续时间约为40 s，震源时间函数显示此次地震有三个子事件 ...
Kaizhi Zhang, Yongge Wan
doaj +1 more source
Dizhen xuebao, 2019 本文提出用四维空间的欧氏距离DFM来表示不同地震震源机制之间的一致性，并以1975年辽宁海城ML7.3地震序列和1999年辽宁岫岩MS5.4地震序列为例分析了主震与前震和余震的震源机制一致性与DFM值之间的关系，其结果显示，当欧氏距离DFM＜50时，两次地震的震源机制接近。为了对若干次地震组成的一组地震的震源机制一致性进行判定，引入了显著性检验方法。根据陈颙提出的震源机制一致性参数K，以符号检验法和统计检验量Z值检验法对岫岩MS5.4地震前小震的震源机制一致性进行了分析，其结果表明，在临近岫岩MS5 ...
Xiangyun Guo +4 more
doaj +1 more source
Pn Velocity Structure and Anisotropy of the Uppermost Mantle Beneath Southeast Asia
Journal of Geophysical Research: Solid Earth, Volume 130, Issue 6, June 2025.Abstract Systematic investigation of the uppermost mantle structure beneath Southeast Asia is of great significance to understand the dynamics of oceanic plate subductions, continental collisions, and material upwelling associated with a mantle plume. To obtain high‐resolution images of Pn wave velocity structure and anisotropy of the uppermost mantle ...
Yuan Li +3 more
wiley +1 more source
利用剪切波分裂研究四川九寨沟MS7.0地震震源区的地壳应力场
Dizhen xuebao, 2019 本文讨论了2017年8月8日九寨沟MS7.0 （MW6.5）地震之后震源区的地震活动性，并针对震后九寨沟地区架设的4个流动地震台站记录到的地震波形数据进行了剪切波分裂参数的计算，分析了震源区地壳应力场的特征性变化。九寨沟MS7.0地震的地震活动性表现为：8月8日主震后震源区地震活动明显增强，直至8月22日之后才有所下降，余震震级整体也呈降低趋势，震级多集中在MS2.0以下。震源区4个流动台站的剪切波分裂结果表明：快波偏振方向近似为东西向，揭示了九寨沟地区的区域应力场方向为近似东西向 ...
Sha Liu +3 more
doaj +1 more source
Authoritarianism and the Emergence of Parallel State Dynamics: Evidence From the Syrian Earthquake
Digest of Middle East Studies, Volume 34, Issue 1, Winter 2025.ABSTRACT This article investigates the Syrian regime's strategic manipulation of the February 2023 earthquake to reaffirm its authority and maintain legitimacy. The regime's response to the disaster is analyzed to understand how authoritarian states leverage natural disasters for political gains. It argues that the Assad regime's survival is not merely
Rahaf Aldoughli
wiley +1 more source