西藏多不杂铜（金）矿床环境地质特征

多不杂斑岩铜金矿地处西藏阿里地区改则县境内,位于改则县城北西方向约100km处。该矿床位于班公湖-怒江缝合带西段北缘,目前已经控制的铜资源量超过400万吨,品位0.46%~1.13%;金资源量超过110 t,品位0.15 ~0. 26g/t（祝向平等,2012）,是西藏继玉龙、驱龙斑岩铜矿后发现的又一个具超大型远景规模的斑岩型富金铜矿床（李光明等,2007）。由于矿床位于藏北高原,生态环境极其脆弱,因此,研究其环境特征有着极为重要的意义。     

A comment on the use of spectral characteristics of teleseismic body waves to evaluate fine crustal structure

An investigation of the crustal response in the time and frequency domains is presented to show that for models with similar crustal transit times of P and S waves, any important changes in the internal configuration of the crust such as layering, layer thickness and velocity contrast only influence the amplitudes of the transfer function ratio. Frequency positions of peaks and troughs remain unperturbed unless the total transit time of P and/or S waves through the crust are varied. This would imply that fine crustal structure derived from a matching of peak positions of observed spectral ratios with theoretical transfer function ratios, as is commonly practiced, is not very meaningful. This limitation in the application of the spectral ratio method for detailed crustal structure is demonstrated using two recent applications of this technique.     

单道地震技术在海洋地质调查中的应用——以威海褚岛北部海域为例

单道地震调查技术方法是海洋地震调查的主要手段之一,海上单道地震具有配置灵活、施工效率高、中—浅部地层分辨率较高、应用面广等特点,在海洋地质调查领域应用广泛。该文简要介绍了单道地震的工作原理,并以威海褚岛北部海域为例,通过分析该区单道地震资料,结合探测目的及仪器性能,制定了针对性的试验方案,确定了分辨率较高的参数优化组合,获得了高质量、高分辨率的海底地层资料。通过对实测单道地震剖面的比较和分析,结合钻孔数据,对威海褚岛北部海域地层进行分层划分及地层单元体系域分析,得出威海褚岛北部海域中—浅地层结构特征及海底地质灾害特征。通过对威海褚岛北部海域单道地震调查应用实例的分析,阐述了海上单道地震在数据采集、处理和解译方面的相关技术。     

土壤地质遗迹及评价体系研究

在分析和研究土壤地质学和地质遗迹发展现状的基础上,首次提出了土壤地质遗迹的概念,并对其进行了厘定.我国土壤地质遗迹分布遵从土壤分布的一般规律,即水平地带性和垂直地带性的分布规律.在选取上兼顾科研科普、经济开发及社会生产等因素.以自然地质属性和科研价值为主要评价因子,建立了土壤地质遗迹评价体系,并以陕西洛川古土壤地质遗迹为实例进行评价,定为一级土壤地质遗迹.结果表明该评价体系具有实用性和可操作性.     

基于裂隙水压力的岩体边坡锚杆加固设计法

基于岩体塑性极限平衡理论,从能量功率角度探讨了一般岩体边坡能量安全系数的合理取值,在假设新的合理的岩体裂隙水压力分布的基础上,提出了锚杆加固基于裂隙水压力的岩体边坡新的设计方法,并给出了工程设计算例,为锚杆加固岩体边坡设计提供了简便易行的新方法。     

ECMWF参考大气谱模式在Convex320机上的发展

将ＥＣＭＷＦ预报模式移植到Ｃｏｎｖｅｘ３２０机上，修改了Ｉ／Ｏ结构，使得该模式在该机上顺利运行，在模式中引入了参考大气。计算了６个实例，取得了较好的结果，另外，在该模式上还ＣＸＳ格式，节省了计算时间，也提高了计算精度。     

Selection of earthquake ground motion records: A state-of-the-art review from a structural engineering perspective

This paper reviews alternative selection procedures based on established methods for incorporating strong ground motion records within the framework of seismic design of structures. Given the fact that time history signals recorded at a given site constitute a random process which is practically impossible to reproduce, considerable effort has been expended in recent years on processing actual records so as to become ‘representative’ of future input histories to existing as well as planned construction in earthquake-prone regions. Moreover, considerable effort has been expended to ensure that dispersion in the structural response due to usage of different earthquake records is minimized. Along these lines, the aim of this paper is to present the most recent methods developed for selecting an ‘appropriate’ set of records that can be used for dynamic analysis of structural systems in the context of performance-based design. A comparative evaluation of the various alternatives available indicates that the current seismic code framework is rather simplified compared to what has actually been observed, thus highlighting both the uncertainties and challenges related to the selection of earthquake records.     

遥感监测墨西哥湾溢油目标识别算法

为了及时监测溢油事故相关信息,防止污染扩张,该文利用2010年4月29日、5月17日及5月24日3个时相的中分辨率MODIS数据,以2010年发生的墨西哥湾溢油事故为例进行目标提取与识别。提取算法考虑到油膜和背景海水易混分的现象,采用了辅加纹理特征量的光谱角匹配算法进行油膜提取;同时,对比了常用的最小距离和支持向量机分类方法;并基于混淆矩阵对结果进行精度验证。结果显示,改进的光谱角匹配算法可以更准确地提取海面目标,精度高达90%以上,能够较好地监测出大面积溢油,可以用于海面溢油灾害的动态监测。     

Lithological control on the elevation of shore platforms in a microtidal setting

The shore platforms on Shag Point, southern New Zealand, are quasi‐horizontal surfaces and are developed between supratidal and low water spring levels. A range of morphologies occur, with more exposed platforms having a distinct low‐tide cliff, in contrast to low‐tide surfaces where the seaward edge is buried beneath rubble and macro‐algal growth. The platforms range in width from 20 to 80 m and are eroded into Late Cretaceous/Early Tertiary fine marine sandstones and mudstones. Shore platforms have formed in two principal lithological units: a homogeneous unit that is characterized by few discontinuities, and a fractured unit with joints spaced about 0·5 m apart. Rock hardness is low in both units (L‐type Schmidt hammer rebound values of 31 ± 4), and there is little systematic variation in values between the two units in which platforms have developed. Case‐hardened concretions within the sandstone are significantly harder than surrounding rock and cause local relief of metre scale as the spherical diagenetic features are eroded from the bedrock. They do not, however, appear to affect broad‐scale platform geometry. Joints within the bedrock are a primary control on platform elevation. Platforms formed in jointed rock occur at the lower portion of the intertidal zone, in contrast to platforms formed in unjointed bedrock, in which horizontal surfaces occur at or above mean high water spring tide level. Rock structure, therefore, appears to be the primary determinant factor of platform geometry at Shag Point. Copyright © 2006 John Wiley & Sons, Ltd.     

青州市地质矿产管理矿产压覆分析的研究与实现

地质矿产管理工作是国土管理的重点,需坚持矿产资源勘查与矿产资源节约利用并重、遏制资源浪费、提高资源综合效益。压覆矿产在一般情况下是不允许开采的,建设项目用地如果会对矿产资源形成压覆,则需要进行矿产压覆分析,查询拟建工程用地范围或规划中建设用地影响范围内矿产资源分布和矿业权设置情况,并将查询结果报省级国土资源部门审核。地质矿产管理系统中,矿产压覆分析是不可缺少的部分。文章通过对青州市地质矿产管理系统中矿产压覆分析方法研究,介绍并展示矿产压覆分析的实现。