Results 31 to 40 of about 618,112 (173)
Experimental study of state vector
, 2004 在地震等灾变的发生之前,会出现一定的前兆现象.文中通过实验方法对这些前兆现象之一的态矢量的异常变化进行了研究.实验使用声发射技术(Acoustic Emission),对三轴应力条件下岩石试件内部微裂纹的产生和扩展进行了记录.实验结果表明在岩石试件最终破坏之前,表征态矢量的相关参量都发生了异常明显的变化,这表明态矢量的异常变化可以被用作为岩石等脆性材料灾变的前兆 ...
Qi Li +12 more
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Structural Control and Health Monitoring, Volume 2026, Issue 1, 2026.During long‐term service, the mechanical properties of laminated rubber bearings are altered by earthquakes, sustained loads, temperature variations, and other factors, thereby reducing their seismic isolation performance. To address the limitation that existing methods cannot achieve in situ, high‐precision detection of bearing mechanical properties ...
Chubing Deng +5 more
wiley +1 more source
2022年9月5日泸定MS6.8地震的同震地质灾害发育特征及主控因素分析
Dizhen xuebao, 2023 基于2022年9月5日泸定MS6.8地震的野外调查，结合遥感解译结果，总结了泸定地震同震地质灾害的发育特征和主控因素，研判了同震地质灾害的演化趋势，并针对同震地质灾害防灾减灾的不同阶段给出了相应的建议。结果显示：泸定地震同震地质灾害整体以小−中型崩塌、滑坡为主，集中分布在磨西镇和海螺沟、得妥镇湾东村、得妥镇大渡河沿岸三个区域；主震和余震、鲜水河活动断裂、地形地貌、特殊岩土体是泸定地震同震崩滑空间分布的主控因素；泸定地震震后地质灾害在未来十年内会极为活跃，需要密切关注磨西河和支沟、大渡河河谷两侧的高陡岸坡、
Jiajia Zhang +11 more
doaj +1 more source
Strong Ground Motion Characteristics of the Saturated Loess Site
Shock and Vibration, Volume 2026, Issue 1, 2026.Significant differences exist in the ground response of saturated and unsaturated deposits to earthquakes, but few relevant studies exist on strong ground motion in saturated loess. We have selected three loess sites that are highly affected by earthquake‐induced liquefaction hazards, analyzed the nonlinear characteristics of the ground motion response
Qian Wang +8 more
wiley +1 more source
Journal of Geophysical Research: Machine Learning and Computation, Volume 2, Issue 4, December 2025.Abstract Seismicity offers insights into the mechanisms of magma generation, transportation, and the status of volcanic activity. Changbaishan is considered the most dangerous volcano in China. However, there was only one permanent seismic station (CBS) near Changbaishan Tianchi caldera before 2007.
Jixiao Ma +4 more
wiley +1 more source
Dizhen xuebao为揭示诱发地震和天然地震对建筑结构影响及其破坏概率分布的影响，本文以我国典型砌体结构为研究对象，开展了考虑诱发地震影响的易损性研究。首先建立了典型三层和六层砌体结构分析模型，然后以40条震级和震中距都接近的天然地震地震动和诱发地震地震动为输入开展Pushover分析，分别建立基于峰值加速度PGA和结构基本周期加速度反应谱值Sa的易损性曲线，最后采用循环往复加载方法对两次诱发地震作用下的结构倒塌易损性进行了分析讨论。结果表明：当以PGA作为易损性输入地震动参数时 ...
Yuanning Li +4 more
doaj +1 more source
Dizhen xuebao, 2021 基于云南地震台网的地震记录，利用基于双差层析成像的时移层析成像方法，开展了2014年5月24日盈江MS5.6和5月30日MS6.1地震前后震源区地下P波速度变化的时空特征研究。结果表明：在盈江MS5.6地震后，震源区的P波速度轻微下降，在MS6.1地震后，相对于MS5.6地震，P波速度继续下降，并下降至最低，下降幅度约为1%，说明P波速度下降的幅度可能与主震的震级大小相关。另外，本研究还观测到P波速度下降与余震分布的时空变化相关，可能是由于余震的动态和静态应力变化造成震源区介质物理性质发生改变 ...
Ying Cao, Jiawei Qian, Jiangpei Huang
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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
2022年1月8日青海门源MS6.9地震序列重定位和震源机制解研究
Dizhen xuebao, 2022 2022年1月8日青海省海北州门源县发生MS6.9地震，震后产生了长约22 km的地表破裂带，青海、甘肃和宁夏等多地震感强烈。本文基于区域地震台网资料，通过多阶段定位方法对门源MS6.9地震早期序列（2022年1月8日至12日）进行了重定位，并利用gCAP方法反演了主震和MS≥3.4余震的震源机制和震源矩心深度，计算了现今应力场体系在门源MS6.9地震震源机制两个节面产生的相对剪应力和正应力。结果表明：门源MS6.9地震的初始破裂深度为7.8 km，震源矩心深度为4 km ...
Yingcai Xu, Xiangyun Guo, Lili Feng
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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