凤凰山地区蒲江-新津-德阳隐伏断裂反射波法地震勘探与断裂活动性研究          下载免费PDF全文

何强  李录明  赖敏  黎大虎  黄伟 《地震地质》2004,26(4):706-715

利用反射波法地震勘探确定了在凤凰山地区蒲江-新津-德阳隐伏断裂通过的具体位置以及断裂的规模和性质,证明了该断裂在向东俯冲的过程中错切了晚更新统沉积物,具有明显的第四纪活动性,对凤凰山台地的形成起到了一定的控制作用。地面地质调查及历史地震研究也证明蒲江-新津-德阳隐伏断裂具有晚更新世活动性,且断裂南段的活动性明显强于北段,表明该断裂的北段是成都平原内部的一条弱地震活动带。同时,文中还对在城市近郊人烟繁杂地带反射波法地震勘探中野外观测系统的布置及地震参数的选取进行了探索,小道间距、小偏移距、多接收道、短排列、多次覆盖、高频检波器接收的工作方法和野外地震参数的合理选取对实现主要干扰波和反射波信号的有效分离,提高地震勘探分辨率起到了至关重要的作用  相似文献   

地震烈度分布快速产出发展概况     

何加勇  陈会忠  李卫东 《国际地震动态》2004,(3):6-9

通过对实时地震仪的数据采集,和新开发的地面运动参数和期望的震动烈度值之间的关系,美国已经实现了仪器地面运动和震动烈度图的快速(3～5min)产出。整个南加州震动值的估计是通过空间测量的地面运动的插值来完成的;插值是基于频率和依赖于振幅的台站修正的。震动图的产出是自动的;通过在南加州的重大地震来触发。通过因特网,公众和科学用途的震动图可以在几分钟内得到;对于紧急响应机构和应急用户,通过数据通信专线可以快速得到这些图。  相似文献   

俄、蒙、中交界7.9级地震   总被引：2，自引：0，他引：2  

柔洁  宋和平  娄少平  刘志坚 《国际地震动态》2004,(4):16-20

2003年9月27日19时33分,在俄、蒙、中边界地区发生了Ms7．9地震,新疆阿尔泰地区强烈有感,地震造成经济损失7600万元人民币。文章对此次地震的基本参数、震源机制作了概述,并用遥感资料对地震的构造环境和破裂过程进行了初步分析。  相似文献   

断层崖演化与古地震研究   总被引：3，自引：1，他引：2       下载免费PDF全文

尤惠川  邓起东  冉勇康 《地震地质》2004,26(1):33-45

从断层崖演化模型及其理论分析入手 ,给出了模型的数学分析解 ,导出了一次突发事件和蠕动成因断层崖演化的等时地形 (地层 )线、最大坡度和崖下堆积体截面积的精确表达式 ,据此分析了可能造成的几何与沉积构造特征。根据野外观察、实验分析及理论研究 ,探讨了断层崖演化及其古地震学研究的一些重要问题 ,提出了与断层崖相关的古地震几何形态、沉积结构和实验分析的综合标志 ,并具体研究和确定了与红果子贺兰山东麓断层崖和孟家湾F2 0 1断层崖相关的 8次古地震事件及其近地表特征和复发周期 ,前者为 2 .0～ 3.0ka,平均 2 .4ka ,后者为 3.3～ 4 .0ka ,平均 3.6ka  相似文献   

Synthesis of coda wave envelopes in randomly inhomogeneous elastic media in a half-space: single scattering model including Rayleigh waves     

Takuto Maeda  Haruo Sato  Takeshi Nishimura 《Geophysical Journal International》2008,172(1):130-154

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Design and development of safety evaluation system of buildings on a seismic field based on the network platform     

Sun Baitao  Zhang Lei  Chen Xiangzhao  Zhang Xinghua 《地震工程与工程振动(英文版)》2015,(1):157-167

This paper describes a set of on-site earthquake safety evaluation systems for buildings, which were developed based on a network platform. The system embedded into the quantitative research results which were completed in accordance with the provisions from Post-earthquake Field Works, Part 2: Safety Assessment of Buildings, GB18208.2-2001, and was further developed into an easy-to-use software platform. The system is aimed at allowing engineering professionals, civil engineeing technicists or earthquake-affected victims on site to assess damaged buildings through a network after earthquakes. The authors studied the function structure, process design of the safety evaluation module, and hierarchical analysis algorithm module of the system in depth, and developed the general architecture design, development technology and database design of the system. Technologies such as hierarchical architecture design and Java EE were used in the system development, and My SQL5 was adopted in the database development. The result is a complete evaluation process of information collection, safety evaluation, and output of damage and safety degrees, as well as query and statistical analysis of identified buildings. The system can play a positive role in sharing expert post-earthquake experience and promoting safety evaluation of buildings on a seismic field.  相似文献   

GEOMORPHIC FEATURES OF THE SHULE RIVER DRAINAGE BASIN IN QILIANSHAN AND ITS INSIGHT INTO TECTONIC IMPLICATIONS          下载免费PDF全文

SU Qi  YUAN Dao-yang  XIE Hong  SHAO Yan-xiu  LIANG Ming-jian. Lanzhou Institute of Seismology  China Earthquake Administration  Lanzhou  China  . Lanzhou National Observatory of Geophysic 《地震地质》2016,38(2):240-258

Because of the strong uplift of the Qilian Shan since late Cenozoic,the drainage basins that are derived from the mountains have undergone strong tectonic deformation.So the typical geomorphology characteristics of these drainage basins may indicate the strong tectonic movement in the region.For example,the Shule River drainage basin,which originates from the western part of the Qilian Shan owns unique geomorphology characteristics which may indicate the neotectonic movement. Stream networks of the Shule drainage basin extracted from the DEM data based on GIS spatial analysis technology are graded into five levels using Strahler classification method.Four sub-catchments,numbered 1,2,3 and 4 are chosen for detailed analysis.Furthermore,the four sub-catchments,the hypsometric integral curves,Hack profiles,SL index and average slope of the Shule drainage basin are determined by GIS tools.In addition,we analyzed the slope spectrum of the Shule drainage basin. The average elevation of the Shule drainage basin is very high,however,the slope of the drainage basin is very low,the gentle slope occupies so large area proportion that the slope spectrum shows a unimodal pattern and a peak value is in low slope region (0°~5°),so tectonic movement has a strong influence on the drainage basin.Under the intensive impact of the tectonic movement of the active fault and regional uplift,the hypsometric integral curve is sigmoid,revealing that the Shule drainage basin is in the mature stage.The Hack profile is on a convex,the longitudinal profile is best fitted by linear fitting and the abnormal data of the SL index of the Shule River has a good fit with the section through which the active fault traverses,that means the tectonic movement of the active fault has strong influence on the river's SL index.It is worth noting that lithologic factors also have great impact on the river geomorphology in some sections. According to the above analysis,we recognize that in the interior of active orogen,the evolution of river geomorphology usually is influenced by tectonic movement and reveals the regional neotectonics in turn.  相似文献   

WEBGIS技术在地震前兆台网中的应用     

尹晶飞  滕云田  王晨  范晓勇 《地震地磁观测与研究》2013,(5):348-352

使用WEBGIS技术,结合地震前兆台网的实际情况,设计完成地震前兆台网的GIS展示工具.该工具以互联网为媒介,使用地理空间数据库存储的全国台站数据,对全国范围内的物理场分布在网络客户端进行发布,方便地震前兆台网用户获取数据,同时丰富地震前兆数据的展示方式.  相似文献   

Late Triassic ammonoid Sirenites from the Sabudani Formation in Tokushima,Southwest Japan,and its biostratigraphic and paleobiogeographic implications     

Yasuyuki Tsujino  Yasunari Shigeta  Haruyoshi Maeda  Toshifumi Komatsu  Nao Kusuhashi 《Island Arc》2013,22(4):549-561

Discovery of Sirenites senticosus (Dittmar) in the upper part of the Sabudani Formation of the Kurosegawa Belt, Kito area, Tokushima Prefecture, Japan, establishes a late Early Carnian age for this part of the stratigraphic unit. Because S. senticosus was mainly distributed in the Tethyan region, its occurrence provides evidence that Late Triassic ammonoids of Japan had strong affinities with those of the Tethyan faunas. This finding clearly differs from the biogeographic distribution of contemporary bivalves in the region, which are referred to as the Kochigatani bivalve faunas, and show strong affinities to faunas of the Boreal region.  相似文献   

Creating a diversified community: Community safety activity in Musashino City,Japan     

Yosuke Maeda 《Geoforum》2012,43(2):342-352

The recent development of the third sector and the government encouragement of it have attracted the attention of many researchers. In particular, geographical research has examined how the third sector has been affected or changed by government policies or guidelines in recent political economic contexts, especially neo-liberalism and also neo-communitarianism. While much research has demonstrated that the relationship between the government and the third sector is becoming closer, and has considered the problematic impact on the sector or the community, recent studies have described a much more complicated relationship and its consequence. In response, this paper attempts to explore alternative effects of government encouragement at the local community level, through utilising empirical data on recent voluntary activity regarding community safety by the Voluntary Organisations for Crime Prevention Patrol (VOCPP) in Musashino City, a suburb of Tokyo in Japan. Before focusing on the case study in Musashino, the paper briefly outlines key geographical literature on the third sector, and also examines recent expectations of Japan’s third sector using Japanese political documents. Finally, the paper argues that the encouragement of government in fact has the potential to work as a ‘catalyst’ leading to a more independent third sector, with a geographically and organisationally less hierarchical structure, and may also assist in developing a more diversified community.  相似文献