城市重力荷载对地震的激发作用

本文是《城市直下型地震初探》(发表于《国际地震动态》1989年10期)一文的续文。该文进一步讨论了城市对地壳的重力荷载作用,通过对比分析,说明这种作用是各种外力对地壳作用之中最大的一个,从而,仅从重力荷载这一方面论证了人为因素激发城市直下型地震的可能性。     

广东及邻区地震的震源机制特征

用初动和振幅比的方法求解广东台网运行以来32个3级以上地震的震源机制解，整理前人求得的83个广东及邻区地震的震源机制结果，分析总结了广东省及邻区的震源机制特征，同时对阳江、新丰江和南澳3个老震区各自的震源机制分别进行了探讨。结果表明，应力作用方式和性质有明显的区域特征，地震多数以走滑错动为主，兼具倾滑分量；新丰江水库地震由于水库诱发的特殊性，只有走滑型和正断型的情况；阳江地区出现一些逆断型地震；主压应力P轴优势方向从广西海南的NS向到广东的NWW向，最后表现为粤闽沿海的近EW。     

筒型基础系缆平台使用过程原型测试分析

本文介绍在国内首次开展的多筒筒型基础平台在使用过程中的原型测试分析研究。对所采用的测试系统和测试方法作了概要描述，对冰荷载、结构动力响应以及筒型基础反力等同步测量数据进行了初步分析。结果表明，本次采取的测量系统是稳定可靠的，其测量数据是可信的。这项成果的取得为筒型基础平台的计算理论和方法的发展提供了原型结构的印证数据，对筒型基础平台的设计具有直接的参考意义。     

高层建筑动态和静态风荷载的确定

简单介绍了利用高频天平测量高层建筑风荷载的原理和试验方法，讨论了高层建筑风响应的计算，提出了一种动态风荷载和静态风荷载沿高度分布的计算方法。结果分析指出：提出的求沿高层建筑高度分布的等效静态风荷载的方法适用于顺风向风力，应用于横风向风力有理论误差。     

波前法在高层结构计算中的应用

概述了高层结构的分析方法，给出了高层结构计算的两种波前法计算过程。文末还给出了广东国际大厦（６３层）模型结构的计算结果，其实测值非常吻合。     

低碳盛会 再炫羊城——访广州市贸促委党组书记、主任曾凯章

正9月16日,由中国贸促会、广州市政府主办,广州市贸促会、市环保局、市科信局、广东省节能协会和广东投资促进会共同承办的第四届中国广州国际低碳环保产品和技术展览会、第三届国际(广东)节能展、第二届广州国际智慧城市展览会在广州琶洲保利展览中心隆重开幕。     

多筒基础平台冰荷载作用下基础反力分析

本文将边界层模型用于吸力桩(筒型基础)这种特殊的桩体，对位于渤海湾锦州地区的JZ9—3筒型基础系缆平台冰力作用下的土压力进行了计算分析，并将计算结果与实测数据进行了对比。结果表明计算值基本上反映了基础土-筒相互作用的应力状态，边界层模型可以有效地分析吸力桩-土相互作用问题。     

高速移动荷载作用下轨道系统的振动研究

本文基于格林函数法，对移动荷载作用下的轨道系统的振动进行了研究，与文克尔梁横型进行了对比，这一方法可推广到高架桥的计算中，所得到的结论具有应用价值。     

1995年日本国兵库县南部地震桩基础典型破坏模式的分析

对于发生在1995年1月17日日本国兵库县南部地震中，以神户市为中心的临海地域中大量由于液化土层的侧向流动引起护坝附近建筑物桩基础在地层中的典型破坏形式进行了破坏和应力分析。将震后破坏建筑物详细的地基调查报告以及用倾斜计及可视照相机等测量手段得到的桩基变形实测结果与解析结果进行了比较分析，对临海建筑物桩基础的破坏机制进行了研究，验证了应力解析的方法-荷载分布法的有效性和实用性。     

数字地震台网对不同区域地震事件的震中定位研究

应用广东数字遥测地震台网数据,通过对广东省周边50 km以外的62次地震重新定位,对比研究广东数字遥测地震台网数据处理软件提供的几种地震定位程序,初步认为:中国东南部、西北部地区及国外距广东地区较近的位于中国东南方向的印尼、日本等地区的地震,3种定位方法均可对其进行定位;而分布在国外较远地区的地震,用Hyposat及locSAT定位程序尚可,且locSAT优于Hyposat定位程序,而单纯型定位程序几乎不能用。     

A Monte Carlo study of rainfall forecasting with a stochastic model

A procedure for short-term rainfall forecasting in real-time is developed and a study of the role of sampling on forecast ability is conducted. Ground level rainfall fields are forecasted using a stochastic space-time rainfall model in state-space form. Updating of the rainfall field in real-time is accomplished using a distributed parameter Kalman filter to optimally combine measurement information and forecast model estimates. The influence of sampling density on forecast accuracy is evaluated using a series of a simulated rainfall events generated with the same stochastic rainfall model. Sampling was conducted at five different network spatial densities. The results quantify the influence of sampling network density on real-time rainfall field forecasting. Statistical analyses of the rainfall field residuals illustrate improvement in one hour lead time forecasts at higher measurement densities.     

Earthquake Engineering and Engineering Vibration Aims And Scope

正This journal is established by the Institute of Engineering Mechanics(IEM),China Earthquake Administration,to promote scientific exchange between Chinese and foreign scientists and engineers so as to improve the theory and practice of earthquake hazards mitigation,preparedness,and recovery.To accomplish this purpose,the journal aims to attract a balanced number of papers between Chinese and     

Foreword

Destructive earthquakes have caused great damage in China and the United States and collapsing buildings havecaused many deaths and injuries. The field of earthquake engineering studies earthquake hazards, the occurrence ofearthquakes of various magnitudes, the nature of the ground shaking during an earthquake, the vibration of structuresduring earthquakes, the strengthening of existing structures and the design of new structures to be earthquake resistant,and finally, how to cope with earthquake damage and restore a city to normal functioning. Such efforts are in progressin both countries, but unfortunately, the language barrier interferes with the free flow of information between China andthe Untied States. It would be mutually beneficial if some means could be developed to promote the exchangeof information across the Pacific Ocean. This new journal has been established for this purpose and its success willbe an important step in promoting earthquake engineering in China and the United States.     

WORLD ASSOCIATION FOR SEDIMENTATION AND EROSION RESEARCH(WASER)

正President:Giampaolo Di Silvio,Italy Vice Presidents:Ulrich C.E.Zanke,Germany Zhao-yin Wang,China The World Association for Sedimentation and Erosion Research(WASER),inaugurated on Oct.19,2004,is an independent non-governmental,non-profit organization.The mission of WASER is to promote international co-operation on the study     

Enhancing remote sensing research on global change to improve our understanding on Earth system processes

正Global Change includes climate change and other environmental changes caused by the joint interaction among various layers of Earth. From the positive side, global change provides new opportunities to human and other living forms on Earth. In the meantime, it creates tremendous challenges and negative impact. At present, the negative impacts have reached all primary processes of the global ecosystem and every aspect of human society, especially causing degradation of the ecosystem. For instance, intensive deforestation causes decline of biodiversity; global warming causes sea level rise and increases     

SCIENCE CHINA Earth Sciences SUBJECT INDEX TO VOLUME 57(2014)

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