Results 1 to 10 of about 269,814 (166)
Earth, Planets and Space, 2022 We propose a local earthquake tomography method that applies a structured regularization technique to determine sharp changes in Earth’s seismic velocity structure using arrival time data of direct waves.
Yohta Yamanaka +5 more
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Crustal velocity structure for Northern Egypt using ambient noise tomography [PDF]
Scientific ReportsThe northern Part of Egypt comprises the southeastern part of the Eastern Mediterranean region. This region is characterized by its complex tectonic setting and earthquake activity.
Hany A. A. Adam +3 more
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Dizhen xuebao, 2021 本文利用2010年1月至2020年6月巧家地震和鲁甸地震震源区周围发生地震事件的走时观测资料，应用双差层析成像方法获得了2014年MS6.5鲁甸地震和2020年5月18日巧家MS5.0地震周边区域中上地壳的P波速度结构。成像结果显示：整个研究区域的速度结构存在很强的非均匀性：在鲁甸地震震源区附近，浅部存在速度高达6.4 km/s的显著高速异常，10 km深度以下存在速度低至约5.8 km/s的明显低速异常；鲁甸地震的初始破裂点位于高低速异常的过渡带；在2010年巧家MS4.8和2020年巧家MS5 ...
Changzai Wang +5 more
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Frontiers in Earth Science, 2023 An MS 6.8 earthquake struck the Luding county in the southeastern section of the Xianshuihe fault on 5 September 2022, causing heavy casualties and serious property losses.
Guangyao Cai +7 more
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Open Geosciences, 2023 Walkaway vertical seismic profiling (WVSP) is known for its high level of credibility in obtaining the relationship between first-arrival traveltime and detector depth through first-arrival picking.
Cai Lu, Chunlong Zhang, Zhibin Zhang
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Dizhen xuebao, 2022 2022年1月8日青海境内的托莱山—冷龙岭断裂附近发生了门源MS6.9地震。结合地壳厚度、速度结构及各向异性等资料探讨了门源地震的深部构造特征，揭示了门源地震的发震位置与地壳结构变化的密切关联。结果显示：门源MS6.9地震发生在地壳厚度和vP/vS值都出现快速空间变化的区域；大约在10—20 km深度范围内，震源位于P波速度从浅到深由高速变低速的垂向过渡区，同时也是S波速度和泊松比分布呈现明显横向变化的过渡区域，震源下方存在明显的低速区；冷龙岭断裂两侧相速度的方位各向异性变化比较明显。1月12日的MS5.
Qiong Wang +4 more
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Velocity Structure of Jets in a Coronal Hole [PDF]
Publications of the Astronomical Society of Japan, 2007 Abstract The velocity structures of jets in a coronal hole have been derived for the first time. Hinode observations revealed the existence of many bright points in coronal holes. They are loop-shaped and sometimes associated with coronal jets. Spectra obtained with the Extreme-ultraviolet Imaging Spectrometer aboard Hinode were analyzed
Kamio, Suguru +6 more
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Fracture and tomography of velocity structures of sandstone under uniaxial loads
Yantu gongcheng xuebao, 2021 The extent of fracture in the loaded rock increases with the increase of the loads, accompanied by changes in velocity structure. To monitor the fracture laws of sandstone under uniaxial loads, the acoustic emission (AE) is adopted.
ZHENG Qiang-qiang 1, 2, 3, XU Ying 2, HU Hao 1, QIAN Jia-wei 3, ZONG Qi 2, XIE Ping 4
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山东地区地壳三维纵横波速度和泊松比结构及其对地震活动性的影响
Dizhen xuebao, 2022 基于山东及邻区丰富的P波和S波到时数据反演获得了研究区内高精度的三维纵横波速度结构和泊松比异常分布形态。结果表明：2020年济南长清MS4.1地震震中位于P波、S波高低速异常和高低泊松比异常过渡带，可能是区域构造应力下长清断裂发生左旋走滑运动的结果；2003年青岛崂山ML4.1地震、崂山震群、乳山震群和长岛震群等的发生可能都受到流体的强烈影响，流体沿已有的较大断裂或相对完整岩体内的裂隙侵入，诱发断裂活动或裂隙破裂，从而导致中强地震或震群活动的发生。
Jianke Fan +4 more
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Structure in the velocity space of globular clusters [PDF]
Astronomy & Astrophysics, 2001 We present an analysis of the velocity space of a sample of globular clusters (GC) with absolute proper motions. The vertical component of the velocity is found to be correlated with luminosity and galactocentric radius. We divided the sample into two luminosity groups above and below the peak of the luminosity function (LF), MV=-7.5, for Galactic GCs.
Alfaro, E. J. +4 more
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