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对１９９６年３月１９日阿图什─伽师６．９级地震震区进行了现场考察，搜集调查到了许多地震前兆、地质地貌变化，建筑物遭受破坏等宏观现象。 相似文献
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对１９９６年３月１９日阿图什－伽师６．９级地震震区进行了现场考察，搜集调查到了许多地震前兆、地质地有为化，建筑物遭受破坏等宏观现象。 相似文献
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经现场考察，１９９６年１２月２１日１６时３９分在四川白玉、巴塘间发生的５．５级地震的宏观震中位于白玉县的沙巴乡至巴塘县的茶洛乡之间的高山无人区。极震区烈度为Ⅶ度，Ⅶ度区面积和Ⅵ度区面积各为３３０和２１００平方公里，等烈度线分布本呈长轴为北西北椭圆形。震区内建筑物破坏严重，地面破坏现象较为普遍，电站与式矿企业也遭受损失。 相似文献
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2014年9月12日至2014年10月31日,在浙江文成-泰顺交界的珊溪水库区域发生了最大震级M4.2地震。珊溪水库地区曾在2002、2006年分别发生过最大震级为ML3.9、ML4.6的地震序列,受这2次地震作用影响,震区房屋已经遭受了一定程度的破坏。2014年地震现场调查发现,震区震感明显,房屋受损现象较为普遍,震害具有叠加效应,出现了"小震致灾"的现象。另外,在震中附近的一些道路边坡上,地震还引发了规模较小的崩塌、滑坡等地质灾害。 相似文献
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1991年3月26日凌晨2时,山西大同-阳高突然发生5.8级地震,这是1989年10月19日6.1级地震之后1年零5个月,破坏性地震又一次袭击雁北地区。老震区重建家园的工作正在进行,这次地震再次造成一定程度的破坏,对遭受震害的震区人民来说犹如雪上加霜。但经受了1989年地震考验的雁北地区的各级政府和地震部门,处惊不乱,镇定自若地按应急预案实施震情监视和抗震救灾工作,对突发性地震事件的应急反应,快速而有效。 相似文献
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2001年1月26日，印度西北部古吉拉特邦发生7．9级强烈地震，造成重大的人员伤亡和财产损失。古吉拉特邦政府地震救灾委员会2月3日公布，已有16000多人死亡，5万多人受伤，数十万人无家可归，震区大量房屋遭受不同程度的破坏，公路、铁路、通讯、供水、电力中断，有8个主要城镇和1016个村庄受灾。，直接经济损失达45亿美元。本文给出了“1．26”大地震的震源参数，印度地震构造和历史地震记录资料，初步总结了这次地震的教训与启示，概述了地震破坏及其对国内经济的重大影响以及国内救灾和国际大援助情况，并简述了印度的地震研究工作。 相似文献
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1988年6月2日、3日道孚县东西乾宁地区相继发生了Ms=4.5级、Ms=5.0级和Ms=4.0级的强烈地震。地震使挪乌托至八美街一带的房屋遭受了不同程度的破坏和损坏。发生这次强烈地震的乾宁地区位于鲜水河断裂带的中部(图1中沿鲜水河断裂分布的长方形斜线区为震区范围)。是近年来国家地震局和四川省地震局重点监测和估计将发生强烈地震的地段之一。应该说,这是一次意料之中而震级略为偏低的地震。 相似文献
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《中国科学:地球科学(英文版)》2014,(3)
正SCIENCE CHINA Earth Sciences,an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China,and published by Science China Press and Springer,is committed to publishing high-quality,original results in both basic and applied research. 相似文献
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《国际泥沙研究》2014,(4)
正Director:Shangfu Kuang,China Vice-directors:Chunhong Hu,China Duihu Ning,China Guangquan Liu,China The International Research and Training Center on Erosion and Sedimentation(IRTCES)was jointly set up by the Government of China and UNESCO on July 21,1984.It aims at the promotion of international exchange of knowledge and cooperation in the studies of erosion and 相似文献
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Richard D. Hey 《地球表面变化过程与地形》1979,4(1):59-72
Feedback mechanisms, which operate upstream through drawdown and backwater effects and downstream through sediment discharge are responsible for channel evolution. By combining these mechanisms with channel processes it euables a dynamic process-response model to be developed to simulate the initial evolution of straight gravel-bed channels. When erosion commences on a land surface, sediment entrained in the headwater reach by hydraulic action is selectively transported, deposited and reworked. This produces a damped oscillation between degradation and aggradation as the channel and valley respond to spatial and temporal variations in sediment calibre and hydraulic conditions. The initial cut and fill phases are responsible for valley incision and floodplain development while secondary and subsequent activity can produce river terraces. Eventually sediment entrainment in the headwaters declines as slopes are reduced. Subsequent channel evolution is relatively insignificant because it is dependent on local weathering activity producing material that can be transported on declining slopes. Therefore landforms produced during the initial phase of development, when local weathering was non-limiting, dominate the landscape. 相似文献
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Based on relocating the Jiujiang-Ruichang earthquake sequence which occurred on November 26, 2005 in Jiangxi Province with the double-difference （DD） algorithm and master event technique, the paper discusses the focal mechanism of the main shock （MsS.7） and the probable seismo-tectonics. The precise relocation results indicate that the average horizontal error is 0.31kin in a EW direction and 0.40kin in a NS direction, and the average depth error is 0.48kin. The focal depths vary from 8kin to 14kin, with the predominant distribution at 10kin - 12kin. The epicenter of the main shock is relocated to be 29.69^oN, 115.74^oE and the focal depth is about 10.Skin. Combining the predominant distribution of the earthquake sequence, the focal mechanism of the main shock and the tectonic conditions of N-E- and NW-strike faults growth in the seismic region, we infer that the main shock of the earthquake sequence was caused by a NW striking buried fault in the Rnichang basin. The nature of seismic faults needs to be further explored. 相似文献
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《水文科学杂志》2013,58(6)
Abstract The western reservoirs represent the principal groundwater system in Morocco. Demographic, industrial and agricultural developments during the last decade have markedly altered groundwater quality. The Mamora coastal aquifer system is among the Atlantic systems which are most heavily threatened by pollution. Agricultural and industrial activities, and rapid urban growth contribute to the pollution of the groundwater. Contamination transport is facilitated by a high permeability of the aquifer formations. In order to assess the actual groundwater quality of the Mamora aquifer and to understand the influence of the factors generating the pollution, an extensive multidisciplinary research programme is in progress, with hydrochemistry and microbiology playing essential roles. The present paper concerns the spatial distribution of physico-chemical parameters in the groundwater, subjected to domestic, industrial and agricultural pollution. Fifty-seven samples were analysed for several parameters (Ca2+, Mg2+, Na+, K+, Cl?, SO4 2?, HCO3 ?, NO3 ?, pH, electrical conductivity and temperature). The microbiological analysis of 143 samples reveals the presence of four kinds of indicator bacteria in the groundwater resources: faecal Streptococci, faecal coliform, Escherichia coli and Clostridium. The physico-chemical results and bacteriological monitoring show that the nitrate and bacteria concentrations exceed the maximum admissible levels, notably around pumping stations in the sectors of Sidi Taibi, Sidi Ahmed Taleb and Aïn Sbaâ. Contamination is generated by uncontrolled anthropogenic activities and accentuated by the high intrinsic vulnerability of the aquifer system. Several parameters appeared to exceed admissibility standards. Measures are recommended to prevent groundwater pollution in the region. 相似文献
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K.-G. Malle 《洁净——土壤、空气、水》1992,20(4):196-204
Zinc in the Environment. In 1990 the world production of zinc ammounted to 7 Mio. metric tons. The main areas of application were: galvanization, alloys like brass and zinc metal. The content in the earth crust varies between 10–300 ppm zinc with a mean of 70 ppm. Uncontaminated surface waters contain less than 10 mg/m3 zinc. Apart from civilization air contains 1–10 ng zinc per m3. These background concentrations are exceeded by orders of magnitude in zinc deposit areas and where anthropogenic influences predominate. Accumulation can occur in sediments and sewage sludge. Molluscs and Algae also accumulate zinc. Zinc is essential for live. With normal food the zinc supply of man is just sufficient. Bioaccumulation of zinc towards man or chronic oversupply of man is not known. Zinc has no teratogenic or mutagenic effects, a suspicion on a carcinogenic effect proved wrong. In stockbreeding and plant cultivation a minimum supply of zinc is necessary. Plants are relatively less sensitive against higher soil contents of zinc. Considering the toxicological and ecotoxicological effects of zinc in the environment, the critical organismens are marine invertebratae like tubifex, daphnia, gammarus and algae. But normally only a minor part of the total zinc contest is biologically available, depending on salt content and pH of the waters. 相似文献