Statistical Research on the Seismic Quiescence Before the 1988 Lancang-Gengma Earthquakes with M=7.6 and 7.2 in Yunnan Province,China     

Liu ZuyinSeismological Bureau of Yunnan Province  Kunming  China 《中国地震研究》1996,(3)

In this paper,the temporal and spatial variation process of seismicity in areas from Lancang to Tengchong before the 1988 Lancang-Gengma earthquakes(M=7.6,7.2),January 1980 to October 1988,is studied in detail according to the theory that the whole process of earthquake sequence in the time stage of anomalous seismicity before a strong event may be considered as the non-homogeneous Poisson process.The results demonstrate that(1)from April 1985 to April 1988,there existed an obvious difference of seismicity in spatial distribution in the whole region; to the north of Lancang,there occurred two seismic quiescent belts:one is 210 km long for M≥3.5 events and anotheris 160 km long for M≥3.0 events; therefore,this may be classified into four sub-regions from south to north,that is,the south region,the mid-region,the mid'-region,and the north region.(2)Before the mainshocks,there existed anomalous seismic quiescence for as Song as 42 months in the mid-region(M≥3.5)and 32.5 months in the mid'-region(M≥3.0)  相似文献   

山西地区近期地壳形变活动特征     

杨炳顺 《山西地震》1996,(2):14-20

根据１９９１年大同—阳高２次中强地震后的水准复测资料，分析了地震前后山西地区的垂直形变场。结果表明，该区垂直形变场震前显示出前兆形变，震后有明显的调整。定点形变分析证实太原台连通管、水平摆震前相继出现异常。大同台短水准震前数年观测到幅值不大的变化。震后，对这２个台继续进行跟踪，结果表明，再次出现新情况，显示出新的特点  相似文献   

脉金矿体侧伏研究方法及应用   总被引：4，自引：0，他引：4  

冯友库 《黄金地质》1996,2(2):36-40

从构造解析，构造地球化学，构造地球物理学，岩石矿物学，地质类比等方面探讨脉金矿体测伏的研究方法，并阐明其在岩金勘查和矿山开采中的应用，以提高脉金深部勘探工程和采矿坑道工程的设计中率。  相似文献   

关于农业地质背景资源与农业区划的思考     

樊华 《江苏地质》1996,20(4):242-245

首次提出地质背景是农业经济的重要的基础潜资源，合理有效的利用地质背景具有明显的社会和经济效益。开展农业地质背景资源研究，有重大的理论和实践意义，并指出了开展地质背景资源与农业区划工作的内容及方法。  相似文献   

An historical review of landslide research in the South Wales coalfield     

A. Almasmoum  S. P. Bentley  H. J. Siddle 《Geotechnical and Geological Engineering》1996,14(1):21-40

Summary The areal density of landslides in the coalfield of South Wales is one of the highest in the UK. During the past 100 years landsliding has had considerable impact, causing structural damage and loss of life. Most of the landslides were initiated under periglacial conditions but many became reactivated due to the activities of humans, particularly during the late 19 th century when widespread urban and industrial development commenced in the Welsh valleys. A number of the area's larger landslides are first-time slides which occurred during the past 100 years. This paper sets out to chart the history of landslide research in the coalfield, which began through work by mining engineers.  相似文献   

六安陆面蒸发场大土体原型化蒸渗仪实验研究     

夏进  方成 《水文》1996,(3):12-16

介绍了六安陆面蒸发实验场开展的大土体原型化蒸渗仪实验研究，阐述了该实体设计思路与原理、结构及功能扩展的特点、观测系统及分辨精度等，供水文、水资源研究参考。  相似文献   

河流泥沙粒径计法分析成果改正方法的实验研究   总被引：2，自引：0，他引：2  

赵伯良  王雄世 《水文》1996,(6):6-13

根据国家行业标准《河流泥沙颗粒分析规程》规定”粒径计分析成果，受群体沉降和扩散影响，应根据标样实验分析确定的方法进行校正“的要求，采集全国性河流１６个测站的悬沙样品，对粒径为０．０６２－０．５ｍｍ分析范围的粒径计法，以单颗沉降分析法为标准进行对比实验，据以确定粒径计法分析成果的改正方法，能充分满足颗分规程的质量检验要求。  相似文献   

THE HISTORY AND STATUS OF GEOPOLITICS AND THE GEOPOLITICAL STRATEGIES OF CHINA     

Liu Miaolong  Zhang Wei 《地理学报(英文版)》1996,(1)

LTlewe~jk~inGeop0uticsbeofiticaisonOfthemoStimPoatbranchesofp0liticalmpaphylnhumanmpaphyThssmpatQfbeoliticshasundeIgOneafewhmes0frisinganddeCirung.SOInetilnesthewiodhaSbonfoedfavourinsomempphers'eyeS,butin0therhmesithasbangiventheedd~and~atargaOfathousandarrowsbyanOtherppaphers.Thetenninationof,the8aredW0rldWarandthedeadofK.HaushofermeantheendofGermangcopolihcal~anditalsoledtothedeCiningOfGapolihcsinaratherlOngtime.Inabout30yearsfromthel940stol977,wboC.Graypublishedhisfamousbookenti…  相似文献   

Using Electronic Mail (E-mail) Surveys for Geographic Research: Lessons from a Survey of Russian Environmentalists*     

Shannon R. M. O'Lear 《The Professional geographer》1996,48(2):209-217

The expansion of the Internet and e-mail access around the globe, especially into less-developed areas, raises the question of how geographers might use this technology for research purposes and the development of appropriate methodologies. This paper identifies three ways in which the use of e-mail surveys for geographic research differs from traditional mail surveys. First, there are substantial differences in selecting an appropriate sample population. Second, electronic medium considerations such as alphabet character translation, survey format, and receiving end conditions pose unique data collection challenges. Third, ascertaining that e-mail addresses to be included in a survey are operative is discussed as a useful means of maximizing the potential of an e-mail survey. Examples from an e-mail survey of environmentalists in Russia illustrate these points.  相似文献   

魏晋南北朝测绘史考     

王树连 《测绘工程》1997,6(3):40-45

概述魏晋南北朝时期的测绘管理及职官设置，疆域测量了及地图绘制，天文观测及其新发现等史实，勾画出了这一时期测绘发展的轮廓。  相似文献