天津滨海地区浅层剪切波速与基底构造关系研究     

高武平  陈宇坤  任峰  闫成国  王志胜  杨菲 《中国地震研究》2012,26(4):512-519

Shear wave velocity is one of the important dynamic characteristics of soil layers and applied widely in aseismic engineering. In this paper, 500 drill logging data are used to make a linear interpolation based on 0.01°×0.01°×1m grid. A shallow 3-D shear wave velocity structure of Tianjin coastal area is obtained. According to the data and geological background, we selected two typical velocity profiles to try to introduce and explain its relationship to basement structure. The results show that the shear wave velocity structure clearly presents the characteristic of stratification and lateral inhomogeneity. Furthermore, the difference of the shear wave structure between tectonic elements is clear and the velocity structure between the two sides of the local or border fault in the Quaternary is disturbed or affected significantly. It intuitively shows that the basement structure and fault activity of this region had good control of sedimentation development and strata formation in the Quaternary period which would have an important effect on engineering seismic and geological condition evaluation.  相似文献   

罗云山山前断裂带阶地调查研究及其构造意义     

孙昌斌  谢新生  许建红 《中国地震研究》2012,26(2):210-221

Located at the west of the Linfen basin, the Luoyunshan piedmont fault zone controls the western boundary of the basin. According to the measurements of the terraces in eight gullies along the Luoyunshan fault zone, five levels of terraces, namely T1～T5 have developed in these gullies. The heights of terraces T1, T2, T3, T4 and T5 are about 3m, 8～10m, about 20m, about 30m and 40～50m, respectively. The dating data of the terraces and investigation of the faulted landforms show that the Luoyunshan fault zone has experienced much activity since the Late Quaternary. The uplift rate of the terraces was 0.41mm/a since the Middle-Late Pleistocene, and 0.75mm/a since the Holocene. The increasing trend of uplift rate of the terraces along the Luoyunshan fault zone from the Middle-Late Pleistocene to Holocene indicates the tendency of gradual tectonic uplift of the fault zone since the late Quaternary. This is in good agreement with the increasing trend of subsidence rate of the Linfen basin from the Late Pleistocene to Holocene.  相似文献   

日本9.0级地震前后华北形变场变化特征与地震趋势分析   总被引：2，自引：0，他引：2  

张晶  刘峡  方颖  刘琦 《地震》2012,32(2):64-72

本文分析了华北主要断裂带基于2011年日本9.0级地震同震位移场的应变变化, 结合华北地区近几年形变异常分析日本9.0级地震前后华北地区形变场的变化特征, 分析了日本9.0级地震对华北地区的影响以及未来值得关注的地区。 日本9.0级地震的发生使得华北地区EW向主压应变有所释放, 不同地区的同震响应存在差异, 部分趋势性变化在日本9.0级地震后有所恢复, 目前郯庐带中南段及附近区域的挤压应变背景和断层活动水平增强值得关注。  相似文献   

2009年云南姚安6.0级地震震源机制与发震构造的分析研究   总被引：1，自引：0，他引：1  

秦双龙  张建国  廖丽霞 《内陆地震》2012,26(1):52-61

利用P波、SV波、SH波初动及其振幅比联合反演震源机制解的方法,计算了2009年7月9日发生在云南姚安6.0级地震余震序列的震源机制解,同时结合地震序列的空间分布,对姚安6.0级地震的发震断层性质和震区应力场特征进行综合分析。结果分析表明：（1）姚安6.0级地震发震断层为NWW—SEE向的直立右旋走滑断层,与美国哈佛大学的主震CMT解节面基本一致,也与余震优势方向分布一致,证明结果可靠;（2）震区主压应力场优势方向为NNW—SSE向,与其现今区域构造应力场主压应力NNW—SSE向一致,表明主震应力场主要受到现今区域构造应力场的控制,同时还有一些小的余震与主震应力场不同,表明震区应力场的多样性和复杂性;（3）结合本次地震序列的空间分布、震源机制解特征、震区断裂构造特征综合分析,综合判定姚安6.0级地震的发震构造属于马尾箐断裂。  相似文献   

形变数字化仪器故障分析     

卢双苓  于庆民  赵小贺  郝军丽  吕春帅  王合乾  毛玉华 《高原地震》2012,24(2):55-60,65

通过对山东省形变仪器故障的总结和分析,提供了形变仪器故障排除的经验,为台站运行维护提供参考。  相似文献   

基于PDA形变台站电子手簿系统的设计与开发   总被引：3，自引：0，他引：3  

蔡宗文  陈新泽  王志鹏  方伟 《华南地震》2005,25(3):57-63

由于PDA掌上电脑具有携带轻便、电池持久耐用,操作简单等特点,利于建立形变台站野外观测基本操作平台.按照有关规范及标准的要求,采用PDA硬件平台,在windowsCE软件支持下,利用Microsoft eMbedded Visual Basic编程环境,通过wince sdk工具模块,实现基于PDA的形变台站电子手簿系统（CaisBook PDA1.0）.采用电子数据防伪技术,建立了完善形变台站水准电子记簿软件,可代替手工记录.  相似文献   

Seismologic applications of GRACE time-variable gravity measurements          下载免费PDF全文

Jin Li  Jianli Chen  Zizhan Zhang 《地震科学（英文版）》2014,27(2):229-245

The Gravity Recovery and Climate Experiment (GRACE) has been measuring temporal and spatial variations of mass redistribution within the Earth system since 2002. As large earthquakes cause significant mass changes on and under the Earth’s surface, GRACE provides a new means from space to observe mass redistribution due to earthquake deformations. GRACE serves as a good complement to other earthquake measurements because of its extensive spatial coverage and being free from terrestrial restriction. During its over 10 years mission, GRACE has successfully detected seismic gravitational changes of several giant earthquakes, which include the 2004 Sumatra–Andaman earthquake, 2010 Maule (Chile) earthquake, and 2011 Tohoku-Oki (Japan) earthquake. In this review, we describe by examples how to process GRACE time-variable gravity data to retrieve seismic signals, and summarize the results of recent studies that apply GRACE observations to detect co- and post-seismic signals and constrain fault slip models and viscous lithospheric structures. We also discuss major problems and give an outlook in this field of GRACE application.  相似文献   

南海北部神狐海域天然气水合物成藏模式研究   总被引：4，自引：0，他引：4       下载免费PDF全文

苏正  曹运诚  杨睿  吴能友  陈多福  杨胜雄  王宏斌 《地球物理学报》2014,57(5):1664-1674

南海北部陆坡神狐海域是我国海洋天然气水合物勘探开发研究的重点靶区,独特的水合物成藏特征,难以利用当前观测到的沉积速率和流体流动条件对其成藏机理进行解释和量化说明,对其形成演化模式和控制因素尚不明确.本文构建了海洋天然气水合物形成演化过程的动力学模型,模型的主控参量为海底沉积速率和水流速率,以此计算了神狐海域天然气水合物聚集演化过程,并与饱和度的盐度测试值进行对比.最后,在研究神狐海域地质构造活动和水合物成藏动力学基础上建立了神狐天然气水合物形成演化模式.认为神狐海域当前的天然气水合物是在上新世末—更新世早期断裂体系水合物基础上继承演化而来的,神狐海域天然气水合物形成演化具有典型的二元模式.第一阶段水合物形成发生在距今1.5 Ma之前构造活动形成的断裂体系中,高达50 m/ka的孔隙水流动携带了大量的甲烷进入水合物稳定带,导致了水合物的快速生成,在4万年内形成了饱和度达20%的甲烷水合物;第二阶段发生在1.5 Ma以来,泥质粉砂沉积使沉积体渗透率骤减,0.7 m/ka的低速率水流使甲烷供给不足,在海底浅层新沉积体中无法生成水合物,仅在水合物稳定带底部有缓慢的水合物继承增长,并因此形成了神狐海域当前观测到的水合物产出特征,而且水合物资源量仍在减少.  相似文献   

滁州地区构造活动特征分析     

赵朋  郑颖平  翟洪涛  潘纪顺  曹均峰  王立会 《华南地震》2014,(3):96-103

通过对安徽滁州地区主要断层活动特征调查、坳陷与断坳发育演化的分析,得出两类构造活动具有一致性,且第四纪以来整体表现为弱活动特点。考虑研究区西侧的郯庐断裂带和东北侧的苏北盆地两个中强构造活动区影响,认为滁州地区处于协调区域构造应力释放的活动状态,地震活动水平较低。  相似文献   

浅析新疆乌什台形变资料畸变图像与周边中强地震的关系     

徐衍刚  潘振生  蒋志英  张锦萍 《内陆地震》2014,(4):372-378

对2007年7月至2011年8月乌什台水管倾斜仪和伸缩仪记录到的畸变图像进行分析总结,乌什周边5级以上地震发生前,乌什台水管倾斜仪和伸缩仪观测数据出现的突跳、掉格等畸变图像,可能是震前地壳运动的反映。  相似文献