Middle and Late Devonian microbial carbonates,reefs and mounds in Guilin,South China and their sequence stratigraphic,paleoenvironmental and paleoclimatic significance

The importance of calcimicrobes and microbialite in carbonate platform and reefal environments has been stressed in recent literature. Burne and Moore[1] introduced the term microbialite to describe the clotted, laminated and undifferentiated fabrics formed by mi-crobial communities. Microbialites are organosedi-mentary deposits that have accreted as a result of ben-thic (prokaryotic or eukaryotic) communities, trapping and binding detrital sediment[1]. Microbial organisms and microbialite are…     

地震测深中的地震波衰减

基于在河南、湖北、江苏、安徽等省和西藏自治区进行的人工地震测深工作,详细分析了不同爆炸方式(水中爆炸、井中组合爆炸、矿山和洞室爆炸),不同炸药量(1.2～500吨)和不同观测距离(5～500公里)的实测资料,讨论了爆炸方式与衰减的关系。结果表明,水中爆炸的弹性波转换系数最大,并以组合爆炸方式获得最佳的效果。本文提出地震测深中的地震波衰减遵循关系式:V_m=β(R/W~1/3)-r式中,V_m 为地表运动最大速度,(R/W~1/3) 为折合距离,r 为衰减系数。(r=1.5～1.6)。文中简要讨论了地壳厚度与地震波衰减的关系。     

The method of design for seismic data database system based on tree structure

Introduction In recent years, with the development of earthquake observation technology, increasing ofobservation stations and improvement of observation instruments which are digitalized and con-nected by network, a great deal of data is recorded, to some extend, which brings difficulty for usto manage and store them. It leads to traditional methods, which use the file system to managemass data, could not satisfy our requirement, and it is necessary to find a new method in place oftradit…     

林甸M S 5.1地震前地震活动图像分析和综合预报方法

通过对黑龙江亚板块及其临近区域的不同时段地震活动图像研究分析,发现了中强震前地震活动图像的一些特点,再回归到地震动力学环境中去,建立了理论解释模型和两条判据假说。以此为基础并结合近年来地震活动图像综合分析后,我们在2005年下半年黑龙江省地震趋势会商意见中提出:松嫩盆地是5级以上中强震的主要孕震区。2005年7月25日林甸Ms 5．1地震对此给予了验证。本文对此过程阐述并作进一步分析,希望这种综合预报方法对地震预报工作有所帮助。     

On gradings for one — dimensional seismologic predictions

This paper gives a complete commentary on some popular gradings which based on the 2×2 contingency table, for one—dimensional seismologic prediction. It contains:

1. In view of the statistical correlation, the Wallen gradingV=√QS is the most equitable one amomg all gradings.
2. Each one of the three gradings: Zhenchao Gu gradingS, Obuhov gradingQ and Shaoxie Xu gradingR, has its own inadequacy although they are so easy for use.
3. A set of gradings can be derived fromV. The harmonic mean ofS andQ, H(S,Q) and the Hedike gradingS _H are the members of this set. The order of some popular gradings are given in Theorem 5. 3.
4. In view of the measure of the overlapping part a gradingW is introduced. Another set of gradings may be derived from it. The index of efficiencyh is the severest one among this set.

     

羌塘盆地及周边地带地球物理场与油气深部构造背景初探

本文对已有的地球物理场资料、地壳与上地幔结构的概略展布以及青藏的高原的大地构造格局进行了综合分析。结果表明：该区沉积层巨厚，重力场表现为负异常，地壳底部与上地幔顶部相对周边造山带上隆，低速异常分布，地幔对流向生此向下聚集，这些要素提出：羌塘盆地具有构成新油气田的深部构造背景和地球物理场特征，基于这些初步认识，文中最后提出了对该盆地进行深化研究的建议。     

热红外遥感鄂尔多斯高原隐伏地质构造

用ＮＯＡＡ－１１的热红外通道数据计算面温度场，依据构造层的地热征解释鄂尔多斯高原第四系覆盖下的隐伏地质构造。     

2000年上半年全世界地震灾害综述

２０００年１～６月份全球地震活动水平为中等编高,但地震灾情较轻,半年内共发生Ｍ≥６地震７６次,其中Ｍ≥７地震８次,Ｍ≥８地震１次,全世界地震共计造成１７３人死亡,１０００多人受伤,经济损失约１亿～２亿美元,重大灾害地震主要发生在印度尼西亚。     

广州(珠江三角洲)数字遥测地震台网建设回顾

广州（珠江三角洲）数字无线遥测地震台网是我国第一个全套引进的数字无线遥测地震系统的数字地震台网,采用２４位数字地震采集、无线数据传输、地震数据处理等先进技术,对增强广东省特别是珠江三角洲地区的地震监测能力发挥了重要作用,为发展和推动我国数字地震观测技术进行了有益的探索和实践。系统介绍了广州台网的建设过程和技术特色。     

2006年国外灾害地震综述

2006年地震活动水平和地震灾害程度均低于往年.地震活动总量相当于过去百年期间平均值的50～70%.外电报道比较有影响的灾害地震19次,死亡超过6900人,伤超过4万人.伤亡人数相当于过去百年期间年平均的37%.较大灾害地震6次.有2次在印度尼西亚,1次在伊朗,1次在夏威夷群岛,中国台湾1次"双震",破坏海底光缆,国际通讯联络一时中断,是世界少有的地震破坏海底光缆事件.