荥经-马边-盐津逆冲构造带断裂运动组合及地震分段特征   总被引：9，自引：5，他引：9       下载免费PDF全文

张世民  聂高众  刘旭东  任俊杰  苏刚 《地震地质》2005,27(2):221-233

逆冲构造带的分段性研究是评价该类发震构造地震危险性的基础工作。荥经-马边-盐津逆冲构造带是青藏高原东南边缘重要的NW向强震构造带,该构造带以逆冲错动为主要活动形式,其组合形式与逆冲强度存在南北差异。通过NE向横向断裂的构造地貌分析,发现横向断裂以右旋走滑活动为主,兼有倾滑活动。根据其与纵向断裂的交接关系,将横向断裂概括为横向分割断裂、横向撕裂断裂和横向转换断裂3种类型,讨论了3类横向断裂在逆冲构造带分段中所起的不同作用,进而将荥经-马边-盐津逆冲构造带分为独立的3段,并分析了各段的地震活动特征。研究表明,荥经-马边-盐津逆冲构造带以横向断裂为标志的3分段特点,既体现了段与段之间断裂活动强度、地震破裂强度与步调的差异,又体现了段内地震破裂步调的一致性,表明横向断裂在一定程度上控制了逆冲构造带的破裂分段,只是横向断裂的类型不同,其所起的作用也不同  相似文献   

内蒙古哲斯敖包茅口期生物礁特征   总被引：2，自引：0，他引：2  

李尚林  王训练  徐兴永  张海军  刘旭东  李进文 《沉积学报》2004,22(3):434-442

内蒙古哲斯敖包茅口期发育典型的生物礁。礁体呈东西向展布,在空间上可明显地划分出后礁相、礁核相及前礁相。礁核相包括礁坪带、礁冠带和礁前缘带。各相带相互位置关系表明当时礁体南侧为滨岸方向,北侧为广海方向。礁体中化石极为丰富,可识别出不同的生物组合。生物组合的空间分布明显受生物礁相带控制,它们之间均为横向关系,反映了生物组合与水动力环境的统一性。  相似文献   

格构锚固技术在治理滑坡中的应用   总被引：2，自引：0，他引：2  

邹勇  傅旭东 《岩土力学》2003,(Z2)

介绍了格构锚固的特点、结构机理及其在滑坡防治中的作用。格构锚固技术具有较好地适应地形变化、受力明确、加固效果可靠、施工速度快、后期维护方便和美化环境等优点。并以三峡库区兴山县复建公路黄树岭滑坡为例,说明格构锚固在滑坡防治应用中具有较好的效果。  相似文献   

磁通门仪器室建设要点     

刘旭东  侯永骏 《东北地震研究》2002,18(3):39-41

地磁观测条件的特殊性决定了仪器观测室建设具有难度，本文介绍了大连地震台按照《地震及前兆数字指导规范（试行）》要求建设磁通门仪器室的过程及结果。  相似文献   

浅覆盖区多源数据融合整合的技术方法     

郭奎城  马江水  孙广瑞  李旭东  李清伟  赵书跃 《地质通报》2008,27(7):1097-1102

多源数据的整合融合技术是在数字化填图平台上开发的一项新技术。工作方法是：将已有的地质矿产、地球物理、地球化学、遥感等多源数据进行计算机整合处理后,提取相关的地质信息,将多源数据与地质数据整合,建立多源数据库,形成多源叠加分析成果图,应用于浅覆盖区的地质填图。  相似文献   

中比例尺地形图数字化方法研究   总被引：3，自引：0，他引：3  

魏旭东 《测绘与空间地理信息》2006,29(1):57-59

针对1∶5000和1∶10000比例尺地形图地形、地物要素的类型、特点、分类编码、图式符号、数字化方法、开发技术等问题进行了深入的研究,探索在AutoCAD平台下开发中比例尺地形图数字化软件,实现中比例尺地形图的定位、数据编辑、交互及批量符号化处理、自动绘制格网图廓等工作,实践证明该方法具有操作简便、地物符号齐全、图形美观、规范,实用性强等特点。  相似文献   

格尔木河流域地下水生态功能及经济损益阈值解析          下载免费PDF全文

黄金廷  崔旭东  王冬  刘文辉  刘向敏  袁立  马日新  魏超 《干旱区地理》2019,42(2):263-270

在西北内陆河流域,地下水是维系人类生存、生态环境和社会经济发展的重要水源,但这些流域生态环境脆弱。为保护地下水资源和脆弱的生态环境,亟待开展地下水合理开发利用研究。本文在分析格尔木河流域水文地质条件、环境地质问题基础上,采用遥感解译、野外调查和地下水动态监测的方法,界定了地下水的生态功能及阈值,即维系植被生态地下水埋深为0.5~10 m、减轻盐渍化程度的地下水埋深应大于3 m、减轻城市内涝的地下库容应大于3.42×10⁸ m³、维系达布逊湖面积的入湖流量应大于2.82×108 m³·a^-1。基于格尔木河流域生态系统服务价值构成,得到减轻城市内涝及减缓盐渍化程度的环境正效益值分别为8 000×10⁴元·km^-2和163×104 元·km^-2;地下水不合理开发利用导致植被退化、河湖面积萎缩的环境负效益值分别为191元·km^-2和1 032元·km^-2。本文研究成果可为流域内地下水资源开发利用和生态环境保护科学依据,同时也可为西北其他内陆河流域地下水合理开发利用借鉴。  相似文献   

Quantitative assessment of the impact of earthquakeinduced geohazards on natural landscapes in Jiuzhaigou Valley     

HU Xu-dong  HU Kai-heng  ZHANG Xiao-peng  WEI Li  TANG Jin-bo 《山地科学学报》2019,(2)

Many natural landscapes that lie in high mountain regions are highly susceptible to geological hazards, and their values and integrity are strongly threatened by the hazards. A preliminary framework was proposed to undertake a quantitative assessment of the impact of earthquake-induced geological hazards on the natural landscapes. Four factors reflecting the aesthetic value, ecological value, integrity of landscapes were selected to assess their vulnerability. The impact of earthquake-induced geological hazards on the landscapes is quantitatively expressed as the product of their vulnerability and resilience. The assessment framework was applied to Jiuzhaigou Valley which was severely struck by the Ms 7.0 earthquake on August 8, 2017. Field survey, satellite image interpretation, high-resolution DEM and unmanned aerial vehicle(UAV) reconnaissance were used to retrieve the values of the assessment factors. Twenty seven World Heritage Sites in the valley strongly influenced by the earthquakeinduced geohazards were evaluated. The impact values of two sites of them(Sparking Lake and Nuorilang Waterfall) are up to 8.24 and 4.65, respectively, and their natural landscapes were greatly damaged. The assessment results show a good agreement with the actual damages of the heritage sites.  相似文献   

Rainfall occurrence and its relation to flood damage in China from 2000 to 2015   总被引：1，自引：0，他引：1  

Li Wei  Kai-heng Hu  Xu-dong Hu 《山地科学学报》2018,15(11):2492-2504

China is highly susceptible to flood disasters and subjected to great damage every year. Furthermore, the flood frequency has exhibited an increasing trend in recent years. Most flood events, including flash floods and river flood, are induced by rainfall. This study investigates annual variations of rainfall occurrence over China during the period from 2000 to 2015 at the national and regional scale using daily rainfall data from the Tropical Rainfall Measuring Mission. The Mann-Kendall test is performed for trend detection, and statistical data of flood damage published by China’s government, including destroyed crop area, damaged buildings, direct economic loss, percentage of GDP (gross domestic product), and death toll are correlatively analysed with rainfall occurrences. The results show that storm rain events show the greatest variation among three rainfall types (moderate rain, heavy rain and storm rain). The variation coefficients of rainfall over Northeast China, North China, and Northwest China are the highest, whereas that for Southwest China is the smallest. Moderate rain, heavy rain over Central China, and moderate rain over Southwest China exhibits decreasing trends, whereas the remaining exhibit increasing trends. The correlation between the rainfall occurrences and these flood damage indices at the national scale shows that only direct economic loss has a strong positive correlation with rainfall occurrences, and the other indices have weaker correlations. The correlation is strong in three north regions, except for death toll in Northwest China. In contrast, the correlation between flood damage and rainfall is weak in East China, Central China, Southwest China, and South China. Overall, death toll is strongly correlated with the number of damaged buildings, implying that flood fatalities in China are likely associated with building collapse, and are dominated by specific extreme events. This study can provide a scientific reference for flood management in China.  相似文献   

中西医结合治疗肝肾亏虚型膝关节骨性关节炎40例          下载免费PDF全文

陈旭东  蒋凯睿  黄河 《应用海洋学学报》2018,34(7):21-23

目的：观察中西医结合治疗肝肾亏虚型膝关节骨性关节炎的临床疗效。方法：将肝肾亏虚型膝关节骨性关节炎患者80例随机分为治疗组和对照组各40例。对照组采用西医常规治疗;治疗组在对照组治疗的基础上加壮骨通络丸联合中药熏蒸治疗,观察治疗前后膝关节功能（LKSS）评分、中医证候积分及综合疗效。结果：总有效率治疗组为85.00%,对照组为60.00%,2组比较,差异有统计学意义（P<0.05）;2组LKSS评分、中医证候积分治疗前后组内比较及治疗后组间比较,差异均有统计学意义（P＜0.05）。结论：中西医结合治疗膝关节骨性关节炎疗效肯定,优于单纯西医治疗。  相似文献