大气季节内振荡：其全球同步性及其与ENSO的关系

利用美国国家环境预报中心和大气研究中心的大气再分析资料，分析研究了大气季节内振荡的年际变化及其与ＥＮＳＯ的关系。揭示了全球不同纬度带之间存在着的大气季节内振荡年际变化的同步性，以及大气季节内振荡与海温和大气向外长波辐射之关系的复杂性。我们还发现大气季节内振荡与Ｎｉｎｏ３指数的关系存在年代际尺度的变化，即，这种关系有时强时弱的现象。     

宁夏南部地区地震活动特征

研究了宁夏南部地区（35°20＇～37°40＇N，104°30＇～106°30＇E）小震综合机制解的变化特征．发现在中强地震前，该地区小震综合机制解的P轴方位偏离平均值，向E或SE偏转，其仰角有增大的趋势，同时小震纵波（Pn和Pg）初动符号一致．6次中强地震的震源机制解表明，该地区P轴方位与主压应力方向基本一致，因此该地区发生破坏性地震的可能性不大．近几年来的地震活动图像显示，该地区的地震活动有向中卫、中宁和同心地区集中的迹象．     

A new model on the cause of Tangshan earthquakes in 1976

Introduction The Tangshan earthquake sequence in 1976 is one of most important events in North China. Although nearly thirty years passed and there are some researches on its cause, it is far from the end. Here we introduce two explanations for the cause of Tangshan earthquakes and point out their defects. One is that there is a diamond block in NEE direction in Tangshan region, which is shaped by cutting action of NingheChangli fault, FengtaiYejituo fault, Luanxian fault and Jiyunhe fau…     

武定6.5级地震孕震过程测震学特征

研究了1995年10月24日云南省武定6．5级强震前的地震活动性参数、空间分布图象、距震中135km的巧家台振幅比、波速比演化特征，结果表明武定6．5级地震孕育发生有明显的阶段性变化，经历了早期（1988年4月－1992年7月），中期（1992年8月－1995年3月），晚期（1995年4月－1995年10月）阶段的发展，最终发生了强震。最后应用岩石破裂实验结果，分析了武定6．5级地震孕震过程。     

河南内乡-镇平ML4.7级地震及其震前 地震活动特征

2000年4月29日河南内乡－镇平ML4．7级地震是一次显著地震事件，地震序列属孤立型，根据震区地震地质背景，等震线分布以及震源机制解的综合分析表明，发震断层为北西向的朱阳关－桐柏断裂，对1992年至今该区2．0级以上地震空间分布的研究认为，震前的地震空间分在由无序到有序的演化过程，即存在一个地震正常活动，地震空间，地震条带，震前震中区平静至发震的发展过程。     

Probabilistic Seismic Hazard Assessment Along the Southeastern Coast of Vietnam

On the basis of the analysis of geological, tectonic characteristics and earthquake manifestation features, a causative relation between geodynamic regime and seismicity has been established for the southeastern coastal zone and continental shelf of Vietnam. The probabilistic methods have been used to evaluate ground shaking effects at Nha Trang city aswell as for the entire study area. Short, intermediate and long term predictions of ground shaking (in the form of peak ground accelerationmaps) show high risks in the coastal zone of central Vietnam and in the southeastern continental shelf of the country.     

Breakthroughs in the biodiversity, biogeography, biostratigraphy, and basin analysis of the Beaufort group

Over the past decade researchers working on the rocks of the Beaufort Group in the main Karoo Basin of South Africa have vastly increased our understanding of this important Permo-Triassic sequence. Many new fossil forms have been discovered, allowing for breakthroughs into the biodiversity, biogeography and biostratigraphy of the group. Taxonomic and phylogenetic advances are many and varied, and cover most of the vertebrate taxa, but with emphasis placed on the temnospondyl amphibians, archosauriforms and non-mammalian synapsids, in particular the anomodontia. Biostratigraphic breakthroughs have centered on the Middle Permian Eodicynodon and Tapinocephalus assemblage zones, the Late Permian Dicynodon Assemblage Zone, and the Triassic Lystrosaurus and Cynognathus assemblage zones. Correlation of these biozones with better dated sequences in Europe, Russia and China has allowed for many chronostratigraphic refinements, which are in turn vital for sequence stratigraphical analysis of the basin fill. Based on fossil data, both the lower (Ecca–Beaufort) and upper (Beaufort–Molteno) contacts of the group have been proved to be highly diachronous. The refined chronostratigraphic framework has also allowed for a better analysis of the basin evolution through time, particularly in terms of the correlation of external stimuli that affect basin sedimentation patterns.     

Estimation of Hourly and Daily Global Solar Radiation at Clear Days Using an Approach Based on Modified Version of Gaussian Distribution

The performance of two models,Jam and Baig,based on the modified version of Gaussian distribution function in estimating the daily total of global solar radiation and its distribution through the hours of the day from sunrise to sunset al any clear day is evaluated with our own measured data in the period from June 1992 to May 1993 in Qena Egypt The results show a high relative deviation of calculated values from measured ones,especially for Jain model,in the most hours of the day,except for those near to local noon.This misfit behavior is quite obvious in the early morning and late afternoon A new approach has been proposed in this paper to estimate the daily and hourly global solar radiation This model performs with very high accuracy on the recorded data in our region.The validity of this approach was verified with new measurements in some clear days in June and August 1994.The resultant very low relative deviation of the calculated values of global solar radiation from the measured ones confirms the     

用于地球物理反演的均匀设计优化算法

将均匀设计、模拟退火和单纯形方法相结合，提出一种全局优化迭代算法．数值模拟表明，它具有搜索速度快、搜索能力强和不需要求导数的特点，可用于地球物理反演研究．