Modelling production caused changes in conductivity for a siliciclastic reservoir: a differential effective medium approach     

Leiv-J. Gelius  Zhong Wang 《Geophysical Prospecting》2008,56(5):677-691

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抗震设防地区评定地震烈度的平均震害指数法          下载免费PDF全文

夏珊  刘爱文 《地震学报》2009,31(1):92-99

在我国烈度表中提到的房屋指的是未经过抗震设计或加固的单层或数层的砖混和砖木房屋．但是随着我国经济的发展,这类房屋的数量在逐渐减少,能够根据抗震设防房屋的破坏情况进行烈度评定对目前的地震现场工作具有重要意义．本文通过震害矩阵和平均震害指数的关系,尝试利用框架结构和砖混结构的震害矩阵得到设防烈度——震害指数的拟合关系,建立不同抗震设防水准的框架结构和砖混结构的烈度评定标准,并利用近年来9次中国大陆地震的烈度评定结果对该评定标准进行验证．本文评定的结果与这些地震现场评定结果基本一致．本研究结果可作为在我国抗震设防地区利用多种结构形式的建筑物破坏情况进行烈度评定的依据   相似文献   

Joint observation of long period tremor signals with broadband seismometer,tiltmeter and gravimeter     

张雁滨  蒋骏  廖盈春  李胜乐  钟铁涛 《地震学报(英文版)》2008,21(6):629-635

We report here the observation result of joint observation of long period tremor signals with broadband seismome-ter,tiltmeter and gravimeter at the HUST(Huazhong University of Science and Technology)station.The observed data were compared and analyzed.Since 2005,the several tens of abnormal tremor signals which are weak,com-plex and duration of 2 to 3 days have been synchronously recorded by the different instruments.The tremor signals have the periodic domain in the range of 3 to 5 minutes,20 to 30 minutes and even more than 1 hour.The observa-tion shows such tremors are a physical existence.The analysis indicates that a part of the tremors caused by the typhoon from the western Pacific Ocean.These tremors have a close relationship with wind velocity of typhoon and distance between the typhoon center and the station.Except these,the cause of others is still unclear.  相似文献   

用地电阻率探测和监测滑坡体实验   总被引：2，自引：1，他引：1       下载免费PDF全文

安金珍  周平根  马麦宁  陈峰  董颖  钟沛林 《地震学报》2008,30(3):254-261

实验采用高密度电阻率方法探测滑坡体的电性结构, 用电阻率变化各向异性方法监测滑坡体的主破裂扩展方向和速率. 实验结果为: ① 电性结构探测实验, 验证了部分原勘测的滑坡体的蠕变体边界和地下水层的深度和厚度, 以及上层介质的性质. 证明滑动带富含地下水层; ② 用电阻率变化各向异性监测实验确定的测点主破裂扩展方向, 与滑坡体GPS位移推断的破裂带方向吻合, 且电阻率变化各向异性系数的变化速率与钻孔倾斜仪测量的滑坡体深部位移变化的速率相应.   相似文献   

5·12汶川地震灾评工作中的几点认识   总被引：3，自引：0，他引：3  

陈学良  徐超  夏珊  陈勇  李方杰  张华 《国际地震动态》2008,(7)

由于汶川地震是新中国成立以来破坏性最强、地震灾害最重、救灾难度最大、波及范围最广的一次地震,在其地震灾评工作中产生了不同于以往地震灾评的诸多问题。针对这些问题,首先给出了汶川地震灾评简况。其次,简单说明了作者参加灾评工作的日程安排。最后,对灾评工作中存在的问题,如烈度评定、生命线宏观损失、抗震设防目标、人员死亡分布等进行了探讨,并给出了几点想法和认识。  相似文献   

胶东地区地壳S波衰减系数和台站场地响应的研究   总被引：1，自引：1，他引：0  

季爱东  李铂  张坤  赵金花  钟普浴 《地震地磁观测与研究》2008,29(1):44-49

根据山东数字地震台网7个地震台的118条波形资料,采用Atkinson方法（1992）,研究了胶东地区的非弹性衰减系数;采用Moya方法（2000）,研究了各台的场地响应。得到胶东地区非弹性衰减Q值随频率,的关系为Q（f）=249×f^0.596;得到的7个台站的场地响应均没有显示出明显的放大效应,这与胶东地区台站均处于岩石地基相符。  相似文献   

潮汐测量中异常“震颤”信号的综合观测试验与挖掘   总被引：4，自引：0，他引：4  

蒋骏  张雁滨  廖盈春  李胜乐  钟铁涛 《国际地震动态》2008,(11)

潮汐测量包含倾斜、应变和重力固体潮等,与地震观测具有共同的物理本质,观测量都与地壳运动有直接力学关系.两者的观测信号在频率域相互重叠、自然衔接,覆盖了从地震波至固体潮频段的所有地动信息.  相似文献   

An information-fusion method to identify pattern of spatial heterogeneity for improving the accuracy of estimation   总被引：1，自引：0，他引：1  

Lianfa Li  Jinfeng Wang  Zhidong Cao  Ershun Zhong 《Stochastic Environmental Research and Risk Assessment (SERRA)》2008,22(6):689-704

While spatial autocorrelation is used in spatial sampling survey to improve the precision of the feature’s estimate of a certain population at area units, spatial heterogeneity as the stratification frame in survey also often have a considerable effect upon the precision. Under the context of increasingly enriched spatiotemporal data, this paper suggests an information-fusion method to identify pattern of spatial heterogeneity, which can be used as an informative stratification for improving the estimation accuracy. Data mining is major analysis components in our method: multivariate statistics, association analysis, decision tree and rough set are used in data filter, identification of contributing factors, and examination of relationship; classification and clustering are used to identify pattern of spatial heterogeneity using the auxiliary variables relevant to the goal and thus to stratify the samples. These methods are illustrated and examined in the case study of the cultivable land survey in Shandong Province in China. Different from many stratification schemes which just uses the goal variable to stratify which is too simplified, information from multiple sources can be fused to identify pattern of spatial heterogeneity, thus stratifying samples at geographical units as an informative polygon map, and thereby to increase the precision of estimates in sampling survey, as demonstrated in our case research.  相似文献   

Sedimentary Phosphorus Form Distribution and Cycling in the Littoral Subzones of a Eutrophic Lake   总被引：2，自引：0，他引：2  

Honglei Liu  Chengqing Yin  Hongjun Wang  Weidong Wang  Baoqing Shan 《洁净——土壤、空气、水》2008,36(1):78-83

Algae which bloom in open water and accumulate in the littoral zones may affect the biogeochemical cycle of phosphorus in eutrophic lakes. To determine such effects, a part of the lakeshore with little allochthonous nutrient input in Taihu Lake, China was selected for this field study. Distinct differences in sedimentary P forms were found among the different littoral subzones. The surface sedimentary total phosphorus (TP) content was 655 mg/kg in the eulittoral subzone and 631 to 641 mg/kg in the infralittoral subzone. Both were much higher than that in the profundal zone (410 mg/kg). Calcium‐bound P (Ca‐P) was significantly correlated to exchangeable P (Ex‐P), and they both had the highest contents in the infralittoral subzone and the lowest in the profundal zone. The aluminum‐ and iron‐bound P (Al‐P, Fe‐P) contents decreased from land to water along the ecotone section. Lower Fe/P ratios and higher Al‐P/Fe‐P ratios appeared in the infralittoral subzone, as compared with the profundal zone. This suggested that the accumulated algae could lead to a great deposit of P in the littoral zones. However, the active sedimentary P form transformation in the littoral zones would also result in a partial release of the accumulated P to the overlying water.  相似文献   

辽西义县四合屯义县组中部湖相沉积岩地球化学及物源特征     

柯霖  高山  潘永信  胡兆初 《地球科学》2008,33(4):504-514

辽西北票上园镇四合屯地区义县组沉积层是热河生物群珍稀化石的重要产出层位之一, 其中蕴含丰富的地壳演化和古地理环境演化信息.分析了四合屯剖面上12m厚的含鸟化石沉积岩层的50件样品的微量元素组成和其中10件样品的主量元素组成.结合前人已发表数据, 得出以下认识: (1) 该套沉积岩具有与下伏火山岩类似的地球化学特征: Mg#值较高, 大离子亲石元素含量较高.稀土元素的分异程度较高, 在微量元素分布蛛网图中表现为明显的Nb负异常和Pb正异常等.因此我们认为义县组高镁火山岩构成了该沉积岩的主要源区之一; (2) 样品的Eu/Eu*=0.48~1.81, 其中大部分样品具负Eu异常.正的Eu异常(7件样品) 主要由于含有长石造成; (3) 通过微量元素Th-Co-Zr/10沉积构造环境判别图解对区域构造环境进行分析, 结果表明该沉积岩物源区具有大陆岛弧和活动大陆边缘物源特征.   相似文献