地下流体地震前兆多层次跟踪法短期预测在粤闽交界和珠江三角洲地区的应用

利用粤闽交界地区、珠江三角洲地区连续10年左右的地下流体资料，研究利用多层次跟踪法进行地震短期预测的效果，结果表明，该法的粤闽交界及近海地区的应用效果较好，但在珠江三角洲及近海地区暂不宜应用。     

浅议地球系统的复杂性及非线性

结合复杂性科学的产生及发展历程，认为复杂性科学对研究地球系统复杂性及非线性具有重要的理论指导和方法论意义。同时，在论述地球系统基本属性的基础上总结了地球系统复杂性及非线性的具体表现，即地球系统的层次性，无特征尺度性，开放性，相干性，临界性，自组织性和其动力学行为的自相似性及分形性。认为地球系统是总体上远离平衡，时空延展的多层圈综合集成，连续开放的复杂耗散动力巨系统。随着复杂性科学和地球系统的复杂性及非线性研究的不断深入，在21世纪，地球科学研究将会取得理论上的重大突破和飞跃。     

随机地震动场激励下拱坝多点输入的抗震可靠度分析

本文首次将空间随机地震场输入用于拱坝随机振动分析之中，与拱坝三维动力学有限元法结合，完成了三维拱坝在空间随机地震动场作用下的随机振动分析方法及算法的研究，另外考虑动力和静力的叠加，提出了三维空间随机地震动场的拱坝抗震可靠度分析方法，最后编制了相应的程序，对小湾拱坝进行了抗震可靠度分析，并与随机变量的结果进行了比较。     

Inversion of Q value structure beneath the Tibet Plateau

A total of 11 earthquakes with 15 Rayleigh wave paths, recorded at 11 broadband digital PASSCAL seismometers installed in the Tibet Plateau by the Sino-U.S. joint research group, were used to determine the phase velocity and attenuation coefficient of surface waves in periods of 10–130 s. The average shear wave velocity and quality factor {ie271-1} structures in the crust and upper mantle were obtained in this region. The result shows the average {ie271-2} is low and there exists a high attenuation ({ie271-3}=93–141) layer in the crust. The depth range of the low {ie271-4} value layer (16–42 km) is consistent with the range of low velocity layer (21–51 km) in the crust. Below 63 km in the lower crust, {ie271-5} decreases with depth from 114 to 34 at depth of 180 km. The low shear wave velocity and low value of {ie271-6} at the same depth range in the crust indicate that the rocks in the range is probably melted or partially melted. According to the shear wave velocity structure, the average thickness of the crust is about 71 km and a clear velocity discontiniuty appears at the depth of 51 km. The low-velocity zone (4. 26 km/s) at depth of 96–180 km may be corresponding to the asthenosphere. Contribution No. 96A0047, Institute of Geophysics, SSB, China. This study was supported by the National Natural Science Foundation of China.     

钱塘江江心排污的数值模拟

从立面二维非恒定流体动力学方程出发,应用κ-ε湍流模式计算流场,再用准三维的浓度对流-扩散方程,即考虑了侧向扩散的立面二维浓度控制方程,模拟了钱塘江江心6个竖管排污在潮流作用下近区浓度场,其结果和实际观测值基本吻合。     

东亚大气环流的低频振荡及与韵律的关系

本文根据北半球500hPa高度场30年(1951—1980)平均的逐候格点资料,对气候平均的东亚各主要大气环流系统的年内变化进行了谐波分析和天气学分析.结果表明,东亚大气环流系统存在着三种主要的大气低频波:年波、半年波和30—50天的季内波;中、高纬度的大气环流以年波振荡为主,低纬度的大气环流以半年波振荡为主;30—50天的季内波是北半球各纬度上都存在的一种波,但它对总方差的贡献在低纬比中、高纬度大.此外,还讨论了年波和半年波这两种大气低频波与我国长期预报中常用的各种韵律指标特别是隔季相关现象的关系.     

福建上杭紫金山铜金矿床地质简介

以宏观角度介绍紫金山铜金矿床地质背景,论述了火山机构、次火山岩、隐爆角砾岩、围岩及围岩蚀变、矿化带及矿化特征,着重总结该矿床找矿标志,以期在地质找矿中得以借鉴。     

岩矿中稀土元素离子交换分离富集的改进及ICP—AES测定

本文通过对离子交换柱的规格改进,提高了分离效率,加快了分离速度(流速v/(ml·min~(-1)))可达1.0—1.5.结合分离富集条件的选择及ICP-AES测定方法的联用,使本法不分析周期短、所耗试剂省,且检测限低、精密度和准确度较高.经标样检验和矿样实测对比,其结果均令人满意.     

Tectono-Sedimentary History of Southeastern Coast Region,China:a Synthesis

According to the ideas and concepts of systems dynamic of continent structure, using previous information related to the study area, combining analyses on orogenic belt, basin and magmatic rock, the present paper synthesizes the tectono-sedimentary development of southeastern coast region, China, with special emphasis on the mountain making, basining and magmafc activity. The tectonic evolution after Late Caledonian orogeny was dominated by alternating rifting and converging, subsiding and uplifting, mountain making and basining in central and southern parts of southeastern China and the adjacent regions to the east and west. Seventeen geologic events, nine events of plate or terrain convergence , and continental crust accretion, as well as eight events of intracontinental rifting and basin faulting , are closely related to the tectonic and sedimentary evolution of the study area. The accompanied intense and frequent sedimentation , folding , faulting , magmatism and ore-forming process allowed huge coal     

2D Coupled 3D:A New Numerical Model for Dual - Structured - Aquifer System

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