The Attenuation Law of Horizontal Peak Acceleration on the Rock Site in Yunnan Area

In this paper,we select 131 accelerograms observed in the Yunnan area and cite 114 accelerograms from western America.By statistical regression analysis,we get two separate acceleration attenuation formulations based on the data of Yunnan and those of both Yunnan and western America.By analyzing and comparing the above results with the result deprived from intensity-earthquake ground motion,this paper proposes the formula below,which may show the acceleration attenuation feature of the Yunnan area:Ap=1291.07e0.5275Ms(R 15)-t.5785     

站队结合流量测次精简分析方法的研究

为适应站队结合的需要，必须对流量测次作精简分析。本文以湖南省株洲站队结构区为研究实例，在测站特性分析的基础上，根据水力因素和环境因素对水位流量关系的影响，将区内测站按水位关系稳定，较稳定、不稳定进行分类。     

大地水准面差距计算方法的研究

本文首先证明了三种大地水准面差距计算方法(迈塞尔方法、文策尔方法、最小二乘配置法)之间的关系。通过对某盆地的大地水准面差距的计算及和多普勒结果的比较,得到了一些对计算我国大地水准面差距有益的结论。     

Inter-element relations in some alkaline suites of the Eastern Ghats Precambrian belt

Element interrelations, with particular emphasis on alkaline earth metals, have been studied quantitatively for three alkaline suites of the Eastern Ghats Precambrian belt. Geochemical characterisation brings the Koraput and the Kunavaram suites closer, relative to the Elchuru suite. K-Ba and K-Rb correlations vary during the fractionation process, being strongly positive for the early members and almost noncorrelatable for the late fractions. The covariant relation between Ba and Sr is not well developed in any of the suites. Significant positive correlation between Rb and the degree of differentiation has been observed for the Koraput and the Kunavaram suites but not for the Elchuru suite. Liappears to be fractionated with the early mafic phases and is negatively correlated with Na. Zr shows a significant positive correlation with differentiation in the Elchuru but not in the Koraput suite although Ti/Zr falls remarkably with advancing differentiation for both the suites. P and Ti are mutually positively correlated in all the three suites and both tend to manifest significant negative correlation with progressive fractionation. K-(P + Ti + Sr) seems to be a good indicator of the fractionation process in the suites investigated.     

Influence of Site and Source Dependent Ground Motion Scenarios on the Seismic Safety of Long-span Bridges in Cologne, Germany

An overlap in frequency between the 1D resonance frequency of sediments and the vibrational frequencies of long-span bridges might lead to a strongly increased structural response of the latter. Interference of surface waves caused by reflections at dipping interfaces may introduce additional unfavourable amplifications. Therefore, the vulnerability of two bridges crossing the Rhine River in Cologne, Germany, was assessed using ground motion scenarios computed for four profiles crossing the Lower Rhine Embayment. Due to their vibrational frequencies being in the vicinity of resonant peaks in the response spectra, the Severinsbridge showed critical loading and the bridge Cologne-Deutz even exhibited grave failure according to the dynamic FE-simulations.     

Engineering-Seismological Analysis of Site Effects in the Area of Cologne

The study was implemented in the framework of the DFNK (Deutsches Forschungsnetz Naturkatastrophen – German Research Network Natural Disasters) project. The area around the city of Cologne was chosen as an object for assessment of seismic hazard and risk. A comprehensive geo-database was compiled for the area, which allows using a computational approach for analysis of site amplification functions and probable surface effects. Taking into account peculiarities of the local soil conditions, the analysis of site effects included both amplification of ground motions and liquefaction potential. These phenomena, having different nature, are interrelated and can considerably contribute to seismic hazard. This paper presents some results obtained on the base of computational analysis using geo-modeling.     

Impacts of the dumping site on the environment: Case of the Henchir El Yahoudia Site, Tunis, Tunisia

The Henchir El Yahoudia landfill is one among many uncontrolled dumping sites in Tunisia with no bottom liner. It is located at the southeastern edge of Sijoumi Sebkha. The site has been exploited since 1963 until 1994. It constitutes a peculiar case because of its situation, its exploitation mode and the nature of buried wastes. Leachate analysis shows that they are strongly charged with nitrogen (especially ammoniacal and kadjedahl), organic compounds with a high biodegradability and a charge of metallic elements exceeding the Tunisian norm NT 106-002. Sediment analyses show that the highest rate of heavy metals and organic matter coincides with clay-richest layers, characterized by the highest specific-surface values. The percolation of these pollutants until the groundwater between 0.5 and 5 m has provoked a pollution characterized by high rates of organic matter (BOD, COD and nitrogen) and heavy metals. To cite this article: A. Marzougui, A. Ben Mammou, C. R. Geoscience 338 (2006).     

城市垃圾填埋场水泥基防渗浆材的研究

针对垃圾填埋场防治沥出液渗漏的要求，研制了一种水泥基膨润土-粉煤灰-水泥（BFS）防渗浆材，该浆材具有渗透系数低、吸附阻滞性能好的特点。介绍了该浆材的材料及试验研究成果。     

山东日照两城镇龙山文化(4600~4000aB.P.)遗址出土木材的古气候意义

通过分析考古遗址中出土木材样品的树种,能够获得龙山文化前时期区域气候与植被环境的信息。文章采用体视显微镜和扫描电子显微镜,对山东日照两城镇遗址出土的部分木材样品进行树种鉴定。分析与研究的结果表明:龙山文化前期,两城镇聚落周围生长着麻栎、辽东桤木、杜梨和刚竹等树种,反映了比现在温暖湿润的气候状况,龙山文化的繁荣发展,可能与这种适宜的气候环境有关。研究结果还标志着,在我国东部地区,利用考古遗址中出土的木材等植物遗存,研究全新世时期高分辨率的气候演化过程及其与人类文化的关系,具有广泛的学术前景。     

A Study of Source Parameters, Site Amplification Functions and Average Effective Shear Wave Quality Factor Qseff from Analysis of Accelerograms of the 1999 Chamoli Earthquake, Himalaya

The accelerograms of the 1999 Chamoli earthquake and nine of its aftershocks, which occurred in Uttaranchal Himalaya, have been analyzed to investigate their source parameters, the site amplification functions and the average effective shear-wave quality factor Q_seff in the region. The fault plane solution of the main shock is obtained using the spectral amplitudes of SH waves (approximated by transverse components of accelerograms) of the high-energy packets observed in the accelerograms of the main shock. It is found to be comparable with the reported solutions in other studies. Similarly the other source parameters (viz., seismic moment = (5.03±1.7) × 10²⁵ dyne-cm, stress drop = 65 bars, source duration = 5.2 s and moment magnitude = 6.4) estimated for the main shock are consistent with the values obtained in other studies. The stress drops estimated for the aftershocks vary from 23 bars to 153 bars and the seismic moment from 1.4 × 10²³ dyne-cm to 2.9 × 10²³ dyne-cm. The average estimated values of the effective shear-wave quality factor Q_seff vary from 655±359 in the Uttaranchal sector of Himalaya and 1475±130 in the Delhi region. In general, the Q_seff value increases with an increase in the epicentral distance reflecting the penetration of the waves into deeper layers of the crust as the epicentral distance of the observation point increases. These values of Q_seff indicate that in general the curst is at low temperatures that will promote brittle behavior and conditions for episodic failure as compared to creep, under the accumulated strains from plate collision at the Himalaya plate boundary. The site amplification characteristics at sites have been identified from the frequency bands of significant amplification observed in the spectral ratios of the horizontal to the vertical component records. The decay of peak ground acceleration (PGA) values with distance has been investigated using the empirical regression curves vis-à-vis the site amplification factors.