太原基准地震台地电阻率干扰形态特征分析

分析太原基准地震台2001年至2011年地电阻率观测中常见干扰因素,着重分析因不同干扰引起的图像变化特征,并就存在的问题提出合理化改进建议,力求对观测场地的选择、线路架设、资料分析、异常的判断及地震预测预报具有一定指导意义。     

形变仪器影响观测质量因素

通过对泰安地震台形变仪器观测资料质量的统计分析,发现影响观测质量的主要因素包括：观测环境的改善、优化可以提高观测精度;仪器管理和数据处理水平可以影响数据精度;降雨、吸潮等可以对曲线趋势变化造成影响;环境恶化,如外界抽水等干扰,会使曲线日变固体潮失真,从而掩盖真实的地壳信息。     

青海地区钻孔应变干扰及异常分析

简要叙述了青海地区6个钻孔应变台站的观测概况,通过分析,认为主要存在观测技术系统和观测环境变化这两类干扰。在排除各类干扰后,发现只有乐都台和湟源台在汶川地震前出现了前兆异常。     

Effect of structural characteristics distribution on strength demand and ductility reduction factor of MDOF systems considering soil-structure interaction

It is known that structural stiffness and strength distributions have an important role in the seismic response of buildings.The effect of using different code-specified lateral load patterns on the seismic performance of fixed-base buildings has been investigated by researchers during the past two decades.However,no investigation has yet been carried out for the case of soil-structure systems.In the present study,through intensive parametric analyses of 21,600 linear and nonlinear MDOF systems and considering five different shear strength and stiffness distribution patterns,including three code-specified patterns as well as uniform and concentric patterns subjected to a group of earthquakes recorded on alluvium and soft soils,the effect of structural characteristics distribution on the strength demand and ductility reduction factor of MDOF fixed-base and soil-structure systems are parametrically investigated.The results of this study show that depending on the level of inelasticity,soil flexibility and number of degrees-of-freedoms(DOFs),structural characteristics distribution can significantly affect the strength demand and ductility reduction factor of MDOF systems.It is also found that at high levels of inelasticity,the ductility reduction factor of low-rise MDOF soil-structure systems could be significantly less than that of fixed-base structures and the reduction is less pronounced as the number of stories increases.     

Dispersion attenuation structure of the crust around the Weifang-Jiashan segment of the Tanlu fault zone in North China

On the condition that the velocity ratio of compressive wave to shear wave is stable during the propagating process of seismic wave, this paper develops an estimation method for medium quality factor based on single station's travel time difference between direct S and P waves and the first period signal of direct P wave. 8 774 high SNR wave data altogether recorded by 75 stations are analyzed. The results show that: (1) under the normal regional stress field, the quality factors Q_mSP in the stable tectonic area are higher than that in the active tectonic area around the Weifang-Jiashan section and its surrounding area in the Tanlu fault zone; (2) in the Juxian-Tancheng section the seismic wave attenuation is relatively quick, and the media is relatively broken, suggesting no tectonic stress accumulation; (3) the Xinyi-Sihong section is currently locking and in accumulating elastic strain energy stage, which has the deep environment and conditions of strong earthquake generation similar to those of the 1668 M8.5 Tancheng strong earthquake.     

抚松井水温动态特征分析

统计分析了抚松井2007年6月1日至2010年12月30日水温数字化观测资料,结果显示抚松井水温动态类型表现为:长期动态特征为上升漂移型;短期动态特征为短周期型,并结合环境和水文地质情况对水温动态的影响因素进行了初步的分析。     

青藏高原多年冻土区高寒草甸植物种群物候学定量研究

采用青藏高原腹地北麓河多年冻土区高寒草甸14种代表性植物种群2009年和2010年两个生长季的物候观测资料, 进行植物种群物候学特征的定量分析, 划分物候类型并指出影响不同物候期的环境因子主次. 结果表明: 营养期和结实期的物候指数都较大, 分别为32.70和24.39, 其他物候期则相对较小; 整个生长期持续天数较短, 为155 d左右. 14种植物可划分为3种类型和6大类群. 在营养期和整个生长期, 与物候变化最为密切的环境因子为降水量, 其次为日照时数, 温度居第三; 而影响其他物候期的因子均以日照时数为主, 降水量和温度依次居后.     

鄂尔多斯盆地上三叠统延长组长9油层组沉积相及其演化*

鄂尔多斯盆地延长组长9油层组发育三角洲—湖泊沉积相,三角洲平原分流河道砂体和三角洲前缘水下分流河道砂体是最有利的储集砂体。在沉积相研究的基础上,根据单因素分析多因素综合作图法,选取了地层厚度、较深水沉积岩含量、砂岩厚度、砂地比、自生绿泥石分布、古生物化石分布和沉积构造分布等单因素,对鄂尔多斯盆地延长组长9油层组上下2段的沉积相平面展布特征进行了深入研究,并探讨了其演化规律。研究表明,鄂尔多斯盆地以发育多水系、多物源注入的环湖分布的多个三角洲为特色,东北部地区主要发育曲流河三角洲,西部发育辫状河三角洲,其中以三角洲平原分流河道和三角洲前缘水下分流河道微相较为发育。长9₂沉积期,半深湖沉积在盆地内较为局限,长9₁沉积期湖盆初始扩张达到最大范围,湖岸线向陆推移,湖域面积扩大,半深湖沉积较发育。由长9₂沉积期到长9₁沉积期,鄂尔多斯盆地沉积水体经历了由浅变深的过程,由此在长9₂的顶部沉积了一套具有生烃潜力的油页岩。     

数字海图的成果质量评测系统研究

总结归纳了海图要素数据存在的主要质量问题,阐述了评测采用的方法和依据,建立了基于质量评测算子库的海图数据要素检测引擎,初步检测出了海图数据成果质量是否存在问题,存在哪些问题,存在问题的性质、数量、位置,通过对成果的总体质量进行分析评价,最终给出了海图数据成果质量分析检测报告。     

秋季南黄海表层海水中溶解氨基酸的分布与组成研究

用高效液相色谱法对2010年9月南黄海33个站位表层海水中总水解氨基酸(THAA)、溶解游离氨基酸(DFAA)、溶解结合氨基酸(DCAA)的分布、组成以及它们与环境因子的相关性进行了研究。结果表明:THAA平均浓度为2.08μmol/L,DFAA平均浓度为0.39μmol/L,DCAA平均浓度为1.69μmol/L。THAA浓度的分布大致呈近岸高、远岸低的特点;DFAA分布的规律性较差,在东部海域(中心约在35°N,123°E)出现高值。相关性分析显示溶解氨基酸与叶绿素a(Chl-a)、溶解无机氮(DIN)、细菌丰度、温度和盐度之间均无显著相关性。THAA中含量较高的个体氨基酸为丝氨酸、甘氨酸、天门冬氨酸、谷氨酸和丙氨酸,总和占70.59%。DFAA、DCAA中的主要成分与THAA基本相同。THAA中个体氨基酸的组成以34°N为界分为南北2个海区呈现明显的区域性特点。