Fault zone structures of northern and southern portions of the main central fault generated by the 2008 Wenchuan earthquake using fault zone trapped waves   总被引：1，自引：0，他引：1  

Songlin Li  Xiaoling Lai Zhixiang Yao  Qing Yang Geophysical Prospecting Center  China Earthquake Administration  Zhengzhou  China Institute of Geophysics  Beijing  China 《地震学报(英文版)》2009,(4):417-424

The rupture process of the May 12,2008 MS8.0 Wenchuan earthquake was very complex. To study the rupture zones generated by this earthquake,four dense temporary seismic arrays across the two surface breaking traces of the main-shock were deployed in July and recorded a great amount of aftershocks. This paper focuses on the data interpretation of two arrays across the central main fault,the northern array line 1 and southern array line 3. The fault zone trapped waves recorded by the two arrays were used to st...  相似文献   

Preface to the special issue on the crustal and upper mantle structure and geodynamics in Chinese mainland     

Chunyong Wang Institute of Geophysics  China Earthquake Administration  Beijing  China 《地震学报(英文版)》2009,(4):321-322

Over the past decade, one important development was the rapid and significant improvement of instruments and observation techniques, such as the broad- band seismometers and the seismic-array observations, which permit to widespread collect seismic wave and then clearly demonstrate the crustal and upper mantle structure.  相似文献   

Numerical modeling of wave equation by a truncated high-order finite-difference method   总被引：1，自引：0，他引：1  

Mrinal K.Sen 《地震学报(英文版)》2009,(2):205-213

Finite-difference methods with high-order accuracy have been utilized to improve the precision of numerical solution for partial differential equations.However, the computation cost generally increases linearly with increased order of accuracy.Upon examination of the finite-difference formulas for the first-order and second-order derivatives, and the staggered finite-difference formulas for the first-order derivative, we examine the variation of finite-difference coefficients with accuracy order and note th...  相似文献   

Spectral element analysis on the characteristics of seismic wave propagation triggered by Wenchuan M_s8.0 earthquake     

YAN ZhenZhen    ZHANG Huai  YANG ChangChun & SHI YaoLin Institute of Geology  Geophysics  Chinese Academy of Sciences  Beijing  China  Laboratory of Computational Geodynamics  Graduate University of Chinese Academy of Sciences  Beijing 《中国科学D辑(英文版)》2009,(6)

The 2008 Wenchuan earthquake occurred in an active earthquake zone, i.e., Longmenshan tectonic zone. Seismic waves triggered by this earthquake can be used to explore the characteristics of the fault rupture process and the hierarchical structure of the Earth's interior. We employ spectral element method incorporated with large-scale parallel computing technology, to investigate the characteristics of seismic wave propagation excited by Wenchuan earthquake. We calculate synthetic seismograms with one-point ...  相似文献   

Epicentral distribution in 2007     

陈培善 《地震学报(英文版)》2008,21(6):672-672

For showing the epicentral distribution in and near China as well as all over the world,two epicentral maps for the earthquakes occurred last year are published annually in the 6-th issue  相似文献   

对样品含水结构的电阻率CT研究   总被引：14，自引：1，他引：13       下载免费PDF全文

郝锦绮  冯锐  李晓芹  周建国  钱书清  高金田 《地震学报》2000,22(3):305-309

采用高密度的电极阵列,对具含水结构样品的视电阻率值进行了测定,并重建了二维电阻率的图象．所得一系列CT图象揭示了样品内部由于裂隙和流体造成的真电阻率分布及其变化．这一方法用于岩石电性模拟实验,使导致样品电性变化的裂隙充水过程得以清楚地揭示．   相似文献   

S140红外源的近红外观测——成协气体的供热     

吴月芳  孙锦  毛信杰  李守中 《中国天文和天体物理学报》1990,(3)

对S140中的红外源用北京天文台1.26米红外望远镜进行了近红外测光,获得了J.H.K三个波段的流量值,并利用红外天文卫星及地面红外和亚毫米波观测资料作了光谱综合分析,得出光谱斜率、红外光度和红外源的壳层结构。 本文还结合CO及NH_3等观测结果分析了红外源成协气体的供热,除了通过尘埃的作用,中心源还可能通过激波对气体输入能量;我们还讨论了外部热源及光电过程和宇宙线的加热作用。  相似文献   

地震矩张量元素M_(rr)的空间分布与中国大陆岩石层地块   总被引：5，自引：0，他引：5       下载免费PDF全文

吴忠良  黄静  张东宁  周公威  张国民 《地震地质》2003,25(1):33-38

用哈佛CMT目录和中国地震震源机制目录给出了地震矩张量元素Mrr的符号的空间分布。这种空间分布图像相当于Tanimoto等 ( 2 0 0 0 )的“地壳势能变化”的空间分布图像的一种简化形式 ,Mrr的符号代表了地震震源处的应力状态。之所以进行这种简化是因为在相当多的情况下 ,地震的震源或矩心深度难以测准 ,并且震源机制目录的完整性得不到保证。将Mrr的分布图像与中国大陆岩石层地块的分布图像进行对照 ,可以发现由Mrr标志的地块内部的应力状态具有相当的一致性。地块边缘处的应力状态与地块内部的应力状态不同 ,似乎表明地块本身具有一定的整体性 ,同时地块之间存在相对运动  相似文献   

大兴安岭北部塔河堆晶辉长岩体的形成时代、地球化学特征及其成因   总被引：16，自引：8，他引：16  

周长勇吴福元  葛文春孙德有　Abdel RAHMAN A A张吉衡  程瑞玉 《岩石学报》2005,21(3):763-775

本文系统地报道了大兴安岭北部塔河辉长岩的主量元素、微量元素和锆石Hf同位素特征,重点讨论了塔河堆晶辉长岩体的岩石成因、原始岩浆的源区特征及其地质意义。研究结果表明,塔河堆晶辉长岩体SiO2含量从42．5％到47．4％,平均为45．2％,Al2O3为15．9-32．9％,平均为23．6％,大于17％,CaO为11．7-17．1％,TiO2<0．5％,P2O5<0．1％,富集LILE, 亏损HFSE,这些地球化学特征类似于活动大陆边缘或岛弧环境的辉长岩。激光ICP-MS锆石年龄测定结果显示,塔河辉长岩形成于333±8 Ma前。负的εHf(t)值(-2--5)表明其源区为富集型岩石圈地幔或下地壳。因此,本文推测,塔河堆晶辉长岩来自于地幔辉石岩的部分熔融,该源区的形成可能与俯冲背景下流体交代作用有关,从而表明在330 Ma左右,该区存在过板块的消减作用,可能与松嫩和兴安地块拼合有关。  相似文献   

混积岩一例--滇东震旦系陡山沱组砂质砂屑白云岩的成因   总被引：11，自引：2，他引：9  

沙庆安 《古地理学报》2001,3(4):56-60

滇东震旦系陡山沱组顶部的砂质砂屑白云岩是一例典型的混积岩,即狭义的混合沉积。岩石中的石英砂分选好,圆度和球度高,它们时稀时密地呈“悬浮”状散布在白云石砂屑沉积物中。其产状及结构构造特征表明,它是当时的海滩砂在海进过程中被搬运到海洋中,并与白云石砂屑混合而形成的。  相似文献