应用MAPGIS制作农级别基准地价图的方法探讨

本文从农级别基准地价图编制的目的和原则入手，详细介绍了用MAPGIS软件编制农级别基准地价图的方法。     

The Statistical Analysis of Migration of Strong Earthquakes-Taking the North China Region asan Example

The migration of strong earthquakes is an important research topic because the migration phenomena reflect partly the seismic mechanism and involve the prediction of tendency of seismic activity. Research on migration of strong earthquakes has mostly focused on finding the phenomena. Some attempts on getting regularity were comparatively subjective. This paper suggests that there should be indices of migration in earthquake dataset and the indexes should have statistical meaning if there is regularity in the migration of strong earthquakes. In this study, three derivative attributes of migration, i.e., migration orientation, migration distance and migration time interval, were statistically analyzed. Results in the North China region show that the migration of strong earthquakes has statistical meaning. There is a dominant migration orientation (W by S to E by N), a dominant distance ( ≤ 100kin and on the confines of 300 ～ 700km), and a dominant time interval ( ≤ la and on the confines of 3 - 4a). The results also show that the migration will differ slightly with different magnitude range or earthquake activity phase.     

MONITORING THE DIFFUSION OF SUSPENDED SEDIMENTS AND STABILITY OF TIDAL RADIAL SAND RIDGES AREA USING MULTI-SATELLITE REMOTE SENSING DATA

Nine Landsat TM tapes and images and MSS images, 10 NOAA tapes and images and 1 SAR image from 1973 to 1997 were used to analyse the diffusion of suspended sediments and the change of tidal radial sand ridges in the northern part of the Changjiang River delta, the South Yellow Sea. The results showed that the diffusion of suspended sediments was controlled by the tide, net current, and submarine topography in this area. The distribution of suspended sediments had close relationship with thesubmarine topography. The old Huanghe River delta and the Changjiang River comprise the main sediment supply for the formation of radial sand ridges, whose evolution can be divided into three stages since the Huangbe River changed its course and flowed northward into the Bohai Sea.     

两个太阳活动区中纵向磁场的分形特征

本研究了１９９０年３月２５日活动区ＡＲ５９８８和１９９０年８月３０日活动区ＡＲ６２３３中太阳磁场的分形特征，主要结果如下：（１）两个活动区中的纵向磁场分布不满足分形布朗曲面；（２）两个活动区中磁场的分形特征十分不同；（３）描述两个活动区磁场分形特征的四个统计参量随时间演化，本扼要讨论了这些结果的物理意义。     

煤矿沉陷区废弃地的再生利用之探索

土地是人类赖以生存的基础，是工业生产活动最基本的生产要素之一。十分珍惜、合理利用每一寸土地是我国的基本国策，也是人类应尽的义务，浪费每一寸土地都是在犯罪。当前，土地资源的开发、保护、管理已纳入各级政府的重要日程，对土地资源的合理利用已成为社会广泛关注的焦点。就煤炭工业城市而言，采煤后沉陷区内废弃和闲置的土地如何进行再生利用，如何变废为宝，造福子孙，成为我们不容忽视的重大课题。解决好这一难题，既是促进地方经济发展的迫切需要，又是建设资源节约和环境友好型社会的必然要求。     

关于南黄海地震区(带)的厘定及其有关的问题

笔者通过对南黄海的地震活动特征分析研究,认为该区的地震活动水平远高于扬州-铜陵地震带,应作为一独立的地震区(带)存在,以利于对该海域的地震研究和监测;并对其地震活动有关的若干问题提出讨论     

冈底斯新近纪钾质火山作用:消减沉积物折返的地球化学与Sr-Nd-Pb同位素证据

在冈底斯岩浆岩带的羊八井地区,林子宗火山岩系上部出现小规模的粗面质火山岩.岩石学与地球化学研究表明粗面岩与时空密切相关的大体积安山质-英安质-流纹质火山岩属于不同的火山岩系:碱性钾质系列与钙碱性系列.详细的地球化学研究证明林子宗晚期小体积钾质岩具有独立的岩浆源区,而非早期钙碱性系统低压岩浆过程演化的产物.粗面质熔岩SiO2含量为62.91%～64.63%,具有高K2O(7.52%～8.05%)、Al2O3(16.64%-17.35%)、低TiO2(0.59%～0.68%)与MsO(0.15%～0.77%).钾质熔岩富集LILE与LREE,亏损HFSE,具有高Rb/Sr(1.1～2.3)、Th/La(0.59～0.80)、Th/U(6.3～10.9)和低Ce/Pb(4.1～6.2)与Ba/Th(4.3～14.5)比值,其同位素组成变化范围分别是87Sr/86Sr(I)=0.7068～0.7075、143Nd/144Nd(I)=0.51241～0.51252、206Pb/204Pb=18.87～18.95、207Pb/204Pb=15.63～15.70和208Pb/204Pb=39.24～39.68.粗面岩的地球化学与同位素特征表明冈底斯新近纪钾质火山岩来源于角闪岩相的消减沉积物熔融.因此,羊八井新近纪钾质火山熔岩提供了印度-亚洲大陆碰撞早期消减沉积物折返的证据.     

鲁西邹平盆地中生代火山岩的演化:对地幔源区的约束

邹平盆地中生代火山岩可分为三个亚组：中、下亚组具有相似的岩石组合,岩性主要为玄武岩-粗面玄武岩-玄武质粗面安山岩-粗面安山岩;上亚组岩性主要为粗面安山岩。火山岩由早期基性向晚期中偏碱性方向演化,与正常岩浆房酸度增高的岩浆分异趋势相同。具有Rb、Ba、Sr等大离子亲石元素（LILE）和轻稀土元素（LREE）富集,Nb、Ta、Ti等高场强元素（HFSE）相对亏损,类似于岛弧火山岩的地球化学特征。Nb／La、Hf／Sm比值随MgO的降低而升高或基本不变,说明高场强元素亏损是岩浆的原始特征。各亚组火山岩相似的稀土配分模式和微量元素蛛网图,表明它们具有共同的岩浆源区和密切的成因联系,分离结晶起了关键性作用。La／Nb、La／Ta、Ba／Nb比值较高,说明成岩物质可能主要来自岩石圈地幔。拆沉的大陆中、下地壳部分熔融形成的熔体与古生代岩石圈地幔（亏损的地幔橄榄岩）的相互作用是岩石圈地幔富集的重要方式,随之该富集地幔在陆内岩石圈伸展和区域热异常的双重作用下发生减压部分熔融而形成具有岛弧特征的邹平盆地火山岩。