初涉地震科普宣传的几点体会   总被引：1，自引：1，他引：0  

韩渭宾 《国际地震动态》2008,(11)

随着防震减灾事业的发展,社会和公众对地震科普宣传的需求与要求越来越高.特别是遇到汶川8.0级突发大震,科普宣传就更加重要.我退休后,按照单位领导的要求和安排,做了一些地震科普宣传方面的工作,尤其是汶川地震后,经常被媒体追得手忙脚乱,团团转.从地震科普宣传实践中,深深体会到几点.(1 好对公众的宣传,自己必须加强学习.  相似文献   

汶川8.0级地震几座近断层桥梁失效模式的探讨     

周国良  李小军 《国际地震动态》2008,(11)

汶川8.0级地震主要有以下几个特点:震级大、震源浅、强震动持续时间长、波及范围面广、破坏惨重、次生灾害剧烈.沿发震断层附近的一些大型桥梁,如庙子坪大桥、百花大桥、小渔洞大桥、石蓑衣大桥等破坏尤其严重.  相似文献   

Statistical model on the surface elevation of waves with breaking     

YeLi Yuan  Feng Hua  ShuWen Zhang  Lei Han 《中国科学D辑(英文版)》2008,51(5):759-768

In the surface wind drift layer with constant momentum flux, two sets of the consistent surface eleva- tion expressions with breaking and occurrence conditions for breaking are deduced from the first in- tegrals of the energy and vortex variations and the kinetic and mathematic breaking criterions, then the expression of the surface elevation with wave breaking is established by using the Heaviside function. On the basis of the form of the sea surface elevation with wave breaking and the understanding of small slope sea waves, a triple composite function of real sea waves is presented including the func- tions for the breaking, weak-nonlinear and basic waves. The expression of the triple composite func- tion and the normal distribution of basic waves are the expected theoretical model for surface elevation statistics.  相似文献   

Accumulation characteristics and the main controlling factors of Lunnan multilayer oil province,Tarim Basin,China     

HaiJun Yang  JianFa Han 《中国科学D辑(英文版)》2008,51(1):65-76

Lunnan region is a large-scale paleohigh with many coexisting oil and gas bearing series. At present, about 2 billions tons of proved, probable and possible oil and gas reverses have been proved there. Eight oil and gas bearing series have been found in the Ordovician, Carboniferous, Triassic and Jurassic of Lunnan region, they all bear the characteristics of large-scale multilayer oil-gas province. Ordovician is the main reservoir series where over 0.8 billion tons of oil geologic reserves were discovered, and a super large-scale marine carbonate oil and gas field has formed. Reservoir space of the carbonate reservoirs is mainly composed of dissolved hole, dissolved pore and fracture in Lunnan paleo-burial hill. Generally, dissolved holes are widely distributed among them. Reservoir developments are mainly controlled by karstification and tectonic disruption. Due to the similar geochemical characters, the Ordovician, Carboniferous, Triassic and Jurassic oil and gas reservoirs present the same oil source rock of Mid-Upper Ordovician, the latter except Ordovician are mostly of secondary oil and gas reservoirs migrated vertically by faults during the process of multiple phase tectonic movement, adjustment and reconstruction. Lunnan composite oil and gas accumulation region is situated in the vicinity of large-scale hydrocarbon generation depressions in three directions, ample oil and gas from hydrocarbon generation depressions supplied the adjacent oil and gas reservoirs once. Hereby, the succeed paleohigh is the long-term hydrocarbon accumulation region, which is favor for the formations of high quality reservors, fault systems and huge-scale composite oil and gas accumulation.  相似文献   

Late Eocene pollen records and palaeoenvironmental changes in northern Tibetan Plateau     

YunFa Miao  XiaoMin Fang  ZhiChen Song  FuLi Wu  WenXia Han  Shuang Dai  ChunHui Song 《中国科学D辑(英文版)》2008,51(8):1089-1098

The Eocene palaeovegetation landscape and palaeoclimate reconstructed from the pollen records in the Jiuquan Basin, northwest China provide some important information on the early uplift of the Tibetan Plateau and the origin and evolution of the aridification in northwest China. The records show the arid-semiarid scrubs with open forest palynofloras controlled by the subtropical high existed in northwest China during the 40.2–33.4 Ma. Four pollen assemblages are found: Nitrariadites-Cheno-podipollis-Pinaceae assemblage (40.2–37.9 Ma) is followed by Chenopodipollis-Nitrariadites assemblage (37.9–34.6 Ma), Pinuspollenites & Abietineaepollenites-Chenopodipollis assemblage (34.6–33.9 Ma), and Chenopodipollis-Nitrariadites assemblage (33.9–33.4 Ma). The percentage of thermophilic types is in anti-correlation with that of the dry types, which means the palaeoclimate is relatively warm-wet or cold-dry during most of that time. Such aridity may be related to the water vapor reduction and the planetary wind system movement northward in response to the cooling caused by small-ephemeral ice-sheets. Supported by the National Key Program for Developing Basic Sciences (Grant No. 2005CB422001), the National Science Foundation of China (Grant Nos. 40334038, 40421101) and the President Fund of Chinese Academy of Sciences  相似文献   

Study of vibrating foundations considering soft-pile-structure interaction for practical applications     

Han Yingcai 《地震工程与工程振动(英文版)》2008,7(3)

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Study of vibrating foundations considering soil-pile-structure interaction for practical applications   总被引：1，自引：0，他引：1  

Yingcai Han 《地震工程与工程振动(英文版)》2008,7(3):321-327

An investigation of soil-pile-structure interaction is carried out, based on a large reciprocating compressor installed on an elevated concrete foundation （table top structure）. A practical method is described for the dynamic analysis, and compared with a 3D finite element （FE） model. Two commercial software packages are used for dynamic analysis considering the soilpile-structure interaction （SPSI）. Stiffness and damping of the pile foundation are generated from a computer program, and then input into the FE model. To examine the SPSI thoroughly, three cases for the soil, piles and superstructure are considered and compared. In the first case, the interaction is fully taken into account, that is, both the superstructure and soil-pile system are flexible. In the second case, the superstructure is flexible but fixed to a rigid base, with no deformation in the base （no SSI）. In the third case, the dynamic soil-pile interaction is taken into account, but the table top structure is assumed to be rigid. From the comparison beteen the results of these three cases some conclusions are made, which could be helpful for engineering practice.  相似文献   

南亚(巴基斯坦)地震灾害分布及成因分析   总被引：3，自引：1，他引：2  

曲国胜  黄建发  李小军  张晓东  宁宝坤  李亦纲 《震灾防御技术》2008,3(1):85-94

通过对南亚地震震害及其成因的分析表明,南亚地震灾害具有以下特点：①南亚地震的发震构造为喜马拉雅前缘弧形逆冲断层,地震地表破裂带发育的巴拉考特镇为此次地震的极震区,大量建筑物倒塌,造成严重的人员伤亡：②建筑物震害呈有规律分布：③地表破裂带和沿河谷两岸以及山坡的滑坡、建筑物没有抗震设防、建筑物结构不合理等是造成损失惨重的主因。  相似文献   

天津滨海新区潜在淹没区发展趋势研究   总被引：1，自引：0，他引：1  

张风霜  杨国华  陈聚忠  韩月萍  宋雯  王太松  孙东颖 《震灾防御技术》2008,3(4):459-467

本文利用2006年以前天滓地面沉降监测资料和塘沽、汉沽地区潜在淹没区RTK加密观测资料,以水准监测点为基本研究对象,深入分析研究了每个测点随时间的沉降变化规律,进而“以点带面”绘制了2005年和2011年天津滨海新区地面沉降速率等值线图。同时,还绘制了2005年塘沽、汉沽地区潜在淹没区地面标高等值线分布图,以及预测的2011年塘沽、汉沽地区潜在淹没区的时空分布和面积。最后,提出了应对地面沉降的相关建议,以供政府控制地面沉降时参考。  相似文献   

汶川8.0级地震中几座近断层桥梁失效模式的初步探讨   总被引：4，自引：0，他引：4  

周国良  崔成臣  刘必灯  李小军 《震灾防御技术》2008,3(4):370-378

“5．12”汶川地震造成了多座大型桥梁严重破坏甚至完全垮塌。本文以庙子坪特大桥、百花大桥、小渔洞大桥、石蓑衣大桥、回澜立交桥为例,介绍了结构形式不同的这几座桥梁的破坏模式,初步分析了震害机理。地震动强度过大、强震持续时间过长、近断层特性以及地质灾害等是造成这些桥梁破坏的客观原因;桥梁结构的某些初始缺陷和特殊结构形式导致的受力复杂性是造成地震破坏的主观因素。针对震害特点和破坏机理,本文还探讨了强震区防御桥梁地震破坏应关注的问题。  相似文献