电磁辐射与孕震过程的初探

通过1994年青海共和的几次强余震和1999年河南县Ms5.1，玛沁Ms5.0，以及2000年甘肃景泰Ms5.9，兴海Ms6.6级地震前后平安电磁波资料的分析，总结了电磁辐射在进入短临阶段后的一些特征，得出了在孕震过程中电磁辐射异常与地震的关系，并初步探讨了地震电磁辐射源的形成与影响电磁辐射的可能因素。     

远场地震电磁辐射强度与孕震震级关系

基于垂直电偶极子激发源模型,首先研究了远场地震电磁场辐射场及其分布特征,其次分析了远场地震电磁辐射强度与孕震震级之间的关系.结果表明垂直电偶极子激发源可以解释孕震区激发电磁辐射现象,是激发地震电磁辐射最有可能的激发源之一;远场地震电磁辐射强度的对数与地震震级呈线性关系,直线的斜率与孕震区裂隙特性分布及其电磁特性有关.研究结果对进一步认识地震电磁辐射现象和拓宽地震监测预报思路均有积极意义.     

地震与电磁辐射关系的定量分析

利用河北省地震电磁辐射台网连续１２ａ的观测资料，研究了地震强度与台站接收的电磁辐射的能量、周期、幅度的关系，并由此总结出５－６级中强地震和４．５－４．９级中等地震的短临预报指标。     

低频电磁辐射仪对地震前的观测资料分析

自从1976年唐山地震后，我国开展电磁辐射观测以来，大量的地震电磁辐射异常事实，再次说明了电磁辐射作为地震短临前兆研究的科学意义。我国在“八五”期间，研究和总结了大量的震例，提出了一些预报的判据（时空强方面），成为一种地震短临预报的新方法。在此基础上，“九五”期间中国地震局分析预报研究中心研制了超低频数字地震电磁辐射仪（EMAOS-L）。根据该仪器的性能和特点，浙江省地震局在“十五”前兆项目期间，     

电磁辐射在短临预报中的应用

本文介绍了电磁辐射对共和地震短临预报的映震效果，及时、空、强的判据，认为利用地震电磁辐射现象进行地震短临预报是一项很好的手段。     

云南地区中强与强烈地震电磁辐射的观测研究

通过一年之内的地震电磁辐射前兆的连续观测,总结了中等强度地震电磁辐射前兆的统计对应率及信号与地震的关系.分析研究澜沧-耿马强震序列的电磁辐射特征,并与中等强度地震的前兆进行了比较.对该前兆作为地震短临预报的可行性及应继续深入研究的有关问题作了分析.      

电磁辐射异常信息的分析与思考

对大丰市地震台地震电磁辐射观测仪１９９３－１１￣１１９５－１０的观测记录资料进行了整理，对出现的异常信息和地震的对应关系进行了统计分析，提出了几点思考和认识，对从事地震电磁辐射的观测人员有一定的参考意义。     

大同—阳高地震及强余震电磁辐射异常

叙述了河北地震电磁辐射观测台网的分布、仪器系统的主要性能和观测资料既况及其分析使用方法，研究了大同－阳高１９８９年１０月１８日６．１级的中强震群和１９９１年３月２６日５．８级地震前后台网电磁辐射记录资料的变化情况，统计、计算了异常参数和数量；得出了地震电磁辐射异常具弱－强－弱－地震、临近地震频率升高，异常变化越强烈，异常时间越长，异常量越大，地震也越强等特征的结论。     

大同－阳高地震及强余震电磁辐射异常

叙述了河北地震电磁辐射观测台网的分布、仪器系统的主要性能和观测资料概况及其分析使用方法，研究了大同－阳高１９８９年１０月１８日６．１级的中强震群和１９９１年３月２６日５．８级地震前后台网电磁辐射记录资料的变化情况。统计、计算了异常参数和数量；得出了地震电磁辐射异常具弱－强－弱－地震，临近地震频率升高，异常变化越强烈、异常时间越长、异常量越大，地震也越强等特征的结论。     

南黄海Ms6.1地震电磁辐射特征

介绍了长江三角洲观测台网记录到的南黄海６．１级地震电磁辐射异常，并结合１９７９年淋阳Ｍｓ６．０、１９８４年南黄海Ｍｓ６．２地震前的电磁辐射观测资料有为内其它资料，分析了异常的主要特征。初步讨论了ＤＰＪ型电磁辐射观测仪的甚低频低及ＵＬＦ型地震电磁信息观测仪的超低频段天线方向特性对震中预测的意义问题。     

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