新疆前兆震群ρ值的研究

研究新疆伊宁——乌鲁木齐和乌什——库尔勒1972年以来发生的49个震群的ρ值表明,ρ<0.55可作为前兆震群的判据指标。分析了ρ<0.55标准下的前兆震群的预测能力,认为,震群序列的ρ值具有一定的预报效能。     

关于地震台站极性校正的问题

国内外的台网中总是一些台站，其极性读取似乎是由大量台站Ｐ波初动的整体分布确定的震源机制相矛盾，这些矛盾通常被作为坏读（ｂａｄ ｒｅａｄｉｎｇ）处理，造成台站的极性问题的复杂原因究竟是什么，利用ＮＥＩＣ的核爆资料，文中给出两种可能推测：台站仪器本身的不可和地震本身的复杂性。     

A crustal seismic velocity model for the UK, Ireland and surrounding seas

A regional model of the 3-D variation in seismic P -wave velocity structure in the crust of NW Europe has been compiled from wide-angle reflection/refraction profiles. Along each 2-D profile a velocity–depth function has been digitised at 5 km intervals. These 1-D velocity functions were mapped into three dimensions using ordinary kriging with weights determined to minimise the difference between digitised and interpolated values. An analysis of variograms of the digitised data suggested a radial isotropic weighting scheme was most appropriate. Horizontal dimensions of the model cells are optimised at 40 × 40 km and the vertical dimension at 1 km. The resulting model provides a higher resolution image of the 3-D variation in seismic velocity structure of the UK, Ireland and surrounding areas than existing models. The construction of the model through kriging allows the uncertainty in the velocity structure to be assessed. This uncertainty indicates the high density of data required to confidently interpolate the crustal velocity structure, and shows that for this region the velocity is poorly constrained for large areas away from the input data.     

A contribution to seismic shear design of R/C walls in dual structures

The paper focuses on the seismic response of walls in dual (frame + wall) structures, with particular emphasis on shear behaviour. Although dual structures are widely used in earthquake-resistant medium-rise and high-rise buildings, the provisions of modern seismic codes regarding design of walls for shear are not fully satisfactory, particularly in the (common) case that walls of substantially different length form part of the same structure. Relevant provisions of the leading seismic codes are first summarised and their limitations discussed. Then an extensive parametric study is presented, involving two multistorey dual systems, one with identical walls, and one with walls with unequal length, designed to the provisions of Eurocode 8 for two different ductility classes (H and M). The walls of the same structures are also designed to other methods such as those used in New Zealand and Greece. The resulting different designs are then assessed by subjecting the structures to a suite of strong ground motions, carrying out inelastic time history analysis, and comparing the results against design action effects. It is found that although modern code procedures generally lead to satisfactory performance (differences among them do exist), the design of walls seems to be less appropriate in the case of unequal length walls. For this case a modified procedure is proposed, consisting of an additional factor to account for the relative contribution of walls of the same length to the total base and an improved envelope of wall shears along the height; this improved method seems to work better than the other procedures evaluated herein, but further calibration is clearly required.     

Epicentral distribution in 2006

For showing the epicentral distribution in and near China as well as all over the world, two epicentral maps for the earthquakes occurred last year are published annually in the 6-th issue     

Strong earthquake activity all over the world and strong-moderate earthquake activity within and near China （June 2007-July 2007）

Illustration All the data in this catalog are chosen from the ″Preliminary Seismological Report of Chi-nese Seismic Stations″ (Its abbreviation is ″Monthly Report″). The catalog includes the events of     

塔里木盆地晚泥盆世及石炭纪岩相古地理

塔里木盆地上泥盆统及石炭系包括5个组，自下而上分别为上泥盆统东河塘组和甘木里克组，石炭系巴楚组、卡拉沙依组和小海子组。其中东河塘组和甘木里克组地质时代为晚泥盆世，巴楚组地质时代为早石炭世杜内早中期，卡拉沙依组地质时代为晚杜内中期至巴什基尔期，小海子组地层时代为巴什基尔末期至莫斯科早期。岩石类型有碎屑岩和碳酸盐岩，还有膏盐岩，并夹薄层火山碎屑岩。沉积相主要为海陆过渡相组合，包括河流、三角洲、滨岸、浅海、碳酸盐岩台地、台地边缘6种相和12种亚相及33种微相。晚泥盆世东河塘期至石炭纪发生过4次较大的海侵，海侵范围由下而上逐渐增大，至晚石炭世小海子期海侵规模最大。东河塘期开始海侵，海水由西而东侵入，此时周缘碎屑物质供应充分，主要为无障壁海岸和障壁海岸沉积，西南缘为浅海相沉积。巴楚期晚期，海侵范围进一步扩大，物源向北或北东方向退却，陆源碎屑物质注入急剧减少，形成了一套富含生屑的碳酸盐岩地层，发育了开阔台地和局限台地亚相沉积。卡拉沙依期中期海侵规模比巴楚期更大，海水深度加大，西部为开阔台地亚相沉积，其余地区为局限台地亚相沉积。卡拉沙依期晚期和小海子期海侵达最大，向东扩展，大部分地区为开阔台地亚相沉积，东部地区为局限台地亚相沉积，塔北大部分地区缺失。     

2—（2，3，5—三氮唑偶氮）—1，8—二羟基—3，6—萘二磺酸与钴的显色反应及应用

介绍了新水溶性显色剂 2 - ( 2 ,3,5 -三氮唑偶氮 ) - 1 ,8-二羟基 - 3,6-萘二磺酸与钴的显色反应及应用 ,建立了测定钴的新方法。在 pH 9.9的Na2 B4O7 NaOH缓冲液中该试剂与钴形成 1∶1蓝色稳定络合物 ,λmax为 5 88.8nm ,Co的质量浓度在 0～ 1 .0mg/L内符合比尔定律 ,表观摩尔吸光系数为 3.46× 1 0 4 L·mol- 1 ·cm- 1 。所拟方法用于环境水样及维生素B1 2 注射液中的微量钴测定 ,结果与原子吸收法相符 ,5次测定的RSD <1 %。     

90年代长江中游异常多雨的气候变化背景分析

利用小波变换技术, 对与长江中游地区夏季降水密切相关的赤道东太平洋海温、西太平洋副高、南海夏季风等物理因子进行时间变化的尺度分离.通过对年代际变化和长期趋势等不同尺度变化的分析, 揭示出90年代长江中游异常多雨和频繁洪涝产生的气候变化背景.