北京台网震相分析与大震速报   总被引：2，自引：0，他引：2  

周来顺 《地震地磁观测与研究》1994,15(4):67-73

阐述了北京台网近远震和特殊震例的震相分析以及如何迅速准确地对大震进行速报。  相似文献   

密云杂岩西段等压冷却P－T－t轨迹确定及地球动力学成因   总被引：3，自引：0，他引：3       下载免费PDF全文

陈能松  王人镜  草文琅  钟增球 《地质科学》1994,(4)

非平衡结构代表的变质反应性质和多种矿物地质温压计的研究表明，北京太古宙密云杂岩西段第二期区域变质作用的退变质Ｐ－Ｔ轨迹具等压冷却特点。Ｓｍ－Ｎｄ同位素定年显示，区内广泛发育的石榴石冠状体形成于（１７１７±３４）Ｍａ。初步分析认为，Ｐ－Ｔ－ｔ轨迹的地球动力学成因可与吕梁运动期间华北地台裂谷作用和同构造壳下岩浆增生的演化背景相联系。  相似文献   

南口－孙河断层活动性研究   总被引：2，自引：0，他引：2       下载免费PDF全文

车兆宏 《地震地质》1994,16(2):115-120

依据大地测量资料，分析研究了南口－孙河断层的活动性及其对区域构造活动的控制作用。研究认为，南口－孙河断层现今仍有活动，东三旗以西为张性反扭。该断层对首都圈构造活动具有控制作用，为一主干断层，近期活动增强。在首都圈构造活动性研究及地震趋势预测中，对南口－孙河断层必须予以足够的重视  相似文献   

北京怀柔HR_（88－1）钻孔剖面磁性地层学研究   总被引：3，自引：0，他引：3  

李龙吟  陈华慧 《地层学杂志》1994,(1)

在系统古地磁样品采集、处理和测量的基础上，运用磁性地层学的研究方法，对北京怀柔地区ＨＲ（８８－１）钻孔剖面进行了详细地层划分，分别确定了该区上新统、下更新统、中更新统和上更新统的分布深度及地质年代。  相似文献   

北京西山杨庄组的划分及地层学意义     

刘振锋  郑桂森 《城市地质》1994,(2):15-19

本文利用近年来区调新资料，论述了西山地区杨庄组岩石特征、沉积环境和地层对比，指出了西山杨庄组的发现对该区地层层序划分的重要意义，探讨了杨庄期燕山地区的古地理状况。  相似文献   

Core-Periphery Models,Regional Planning Theory,and Appalachian Development     

Tyrel G. Moore 《The Professional geographer》1994,46(3):316-331

This paper employs a core-periphery perspective to review regional planning theory and examine the spatial dynamics in Appalachian development which span 25 years of Appalachian Regional Commission programs. Improved conditions, defined by increasing incomes in counties, are examined. The region is conceptualized as comprising two exterior peripheries and an interior periphery. This perspective is valuable in illustrating the region's development and for further planning efforts in Appalachia.  相似文献   

Geographical Dimensions of Environmental Restructuring in New Zealand*     

Chris Cocklin  Owen J. Furuseth 《The Professional geographer》1994,46(4):459-467

During the 1980s, New Zealand underwent a period of dramatic economic, social, and administrative restructuring. The reform extended to the administrative arrangements for environmental management. A geographic restructuring model is used in this paper to establish the context in which the reforms were carried out. A combination of economic, environmental, and social influences operating at different geographic scales can be identified. These influences are subsequently illustrated through reference to three aspects of the restructuring that have distinct geographical dimensions: the definition of human-environment relations, the spatial definition of planning regions, and the implications of spatial differentiation for resource management policy and practice.  相似文献   

关于复合片钻头钻进工艺的试验研究     

汤凤林  杨凯华  孙立朋  谭义贤 《地球科学》1993,2(1)

用试验设计方法研究了复合片钻头钻进时机械钻速、碎岩功耗、钻头磨损与规程参数的关系,求出了它们的最优值以及与其相应的钻进规程最优值。  相似文献   

波形模板匹配定位方法在北京地区的应用     

葛慧颖  李红谊  黄雅芬  王同利  刘敏  李炎臻 《震灾防御技术》2020,15(4):788-801

在地震学研究中，高效的微震检测方法是既重要又具有挑战性的问题。本文对波形模板匹配检测方法、匹配定位技术、波形自相关检测技术进行详细介绍和对比，对国内外应用实例进行总结，并展望微震检测方法应用前景和发展趋势。利用基于图形处理器加速的匹配定位技术和双差地震定位法，对北京地区19个台站记录的2015年连续地震资料进行分析。基于中国地震台网中心提供的地震目录，筛选出245个地震事件作为模板事件，检测得到1229个地震事件，约为地震台网原始地震目录数量的5倍。精定位结果可显示小震沿黄庄-高丽营断裂周边小断裂分布形态特征，本文微震检测和定位结果可为研究北京地区地震活动性与发震断层深部构造提供基础数据支撑。  相似文献   

Geography,planning and the law: a coastal perspective     

Bruce Thom 《The Australian geographer》2004,35(1):3-16

This paper examines how legal structures interact with land‐use decisions in the coastal zone. The emphasis is on NSW where there has been a steady evolution of legislative and other measures to regulate how the coast is to be planned and managed. These measures arise from a long history of individual, corporate, local government and State agency actions directed more at private benefit than at protecting and conserving environmental values for the public good. Alienation of foreshores, restrictions on access, buildings located in hazardous areas, canals exposing soils rich in acids, and pollution of waterways are examples of degradation on this coast. Yet much remains to be protected. Expansion of coastal national parks over the past decade has helped. But new planning controls have been introduced to support the NSW Coastal Policy (1997 NSW Coastal Policy (1997) A sustainable future for the New South Wales coast NSW Government, Sydney  [Google Scholar]). In essence, there is evidence that the State government seeks to implement environmentally sustainable development principles to ensure that as the population continues to grow, decisions on future land uses will reflect the functioning of ecosystems and the dynamics of coastal and catchment geomorphology and hydrology. Pressures from individuals and corporations exercising traditional property rights need to be managed within a statutory framework that facilitates sustainability of coastal environmental values cherished by so many.  相似文献