共查询到20条相似文献，搜索用时 62 毫秒
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2003年2月24日新疆巴楚—伽师交界地区发生了MS6.8地震。地震的发生除了对建筑物及构筑物与水利、交通、电力、电信设施造成了不同程度的破坏外,在地震烈度Ⅶ度以上(包括Ⅶ度)地区产生了不同程度的地震地质灾害。地震地质灾害主要为场地砂土液化、地裂缝与河流陡岸滑塌等类型。随后在新疆巴楚—伽师6.8级地震灾区开展了地震小区划工作,对Ⅶ、Ⅷ、Ⅸ度区进行了场地工程地质条件勘测与综合评价,判定该地区未来可能产生的主要地震地质灾害为场地砂土液化、河流陡岸滑塌。 相似文献
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对１９６６年３月８日和３月２２日邢台地震中的房屋破坏情况进行统计，计算了地震区主要房屋土坯墙房在Ⅶ－Ⅸ度中的毁坏率、严重破坏率和中等破坏率。通过ｘ＾２检验得出，Ⅶ度和Ⅷ度区房屋毁坏率、严重破坏率和中等破坏率的分布均服从正态分布。 相似文献
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《华北地震科学》2021,39(3)
基于ArcGIS软件对河北省地震灾害分布特征进行分析,以期为河北省地震灾害评估、应急救援工作提供科学依据。研究表明:河北省内历史上发生破坏性地震(MS≥4 34)193次,地震灾害在空间上遍布河北省11个地市(除承德市),主要集中在唐山、张家口、邢台3个地区,占河北省内地震灾害的58.09%;从统计结果来看,河北省各市区地震分布具有明显的差异性,同时具有丛集性的特点,地震地质灾害主要分布在河北唐山冲积平原和滨海平原区、邢台和邯郸的山前冲积平原烈度为Ⅶ度及以上地区,喷砂冒水与地裂缝具有共生现象,以河流两侧地区最为发育;从地震烈度角度分析,河北省所受的最大地震影响烈度为Ⅺ,全省168个县区有165个遭受过Ⅵ以上破坏,约占98%。 相似文献
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１９９６年２月２８日宜宾５．４级地震的宏观震中位于永兴镇，震中烈度达Ⅶ度，地震等烈度线呈长轴为北东向的椭圆状分布，震区总面积约１５０平方公里，这次地震共造成１人死亡，地震总经济损失为５２６１万元。 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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根据历史文献记载 ,我国历次正式出版的地震目录 ,皆将此次地震审定为M5 ,宏观震中为41 8°N ,1 2 3 4°E ,震中烈度为Ⅶ度。为进一步核实此次地震的参数 ,笔者查阅了已发表的有关资料 ,调阅了辽宁省档案馆 3 0卷历史档案 ,以确定文献中提供的破坏点的具体位置 ,统计了近、现代中强地震的烈度分布和人员伤亡情况 ,咨询了有关专家。经进一步研究认为 ,历次出版物对这次地震宏观震中位置和震中烈度的认定是合适的 ,但Ⅶ度区范围较笼统。我们依据历史地震烈度评定原则 ,确定了各破坏点的烈度 ,圈定了Ⅶ度区的范围 ,宏观震中在Ⅶ度区内 ,地震发生在当时的沈阳市区 ;根据极震区建筑物破坏程度和极震区长轴尺度、现代中强地震的震中烈度和人员伤亡情况 ,并考虑到确定历史地震的误差 ,震级取M5 较为合理。 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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《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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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