共查询到20条相似文献，搜索用时 250 毫秒
1.
美国的板块边界观测(PBO)计划 总被引：7，自引：0，他引：7
张宝红 《大地测量与地球动力学》2004,24(3):105-108
板块边界观测(PB0)计划是美国科学项目“地球透镜计划”(Earthscope)的组成部分。该计划的基本内容是沿板块边界布设由GPS、钻孔应变和激光应变观测点构成的台网，用于研究北美大陆西部板块边缘地区的变形。本文简要介绍了该计划产生的背景、拟解决的科学问题、所采用的观测手段以及管理和经费预算等情况。 相似文献
2.
地幔对流被认为是板块运动的驱动力源，但板块说提出35年来，始终未能阐明地幔对流是如何推动板块运动的，也未能证明地幔对流的存在。相反，却有观测与实物证据证明地幔对流并不存在。对地幔对流提出的质疑与剖析，将有助于地球动力学研究思路的扩展。 相似文献
3.
相对板块运动不能表明板块各自的运动速度，绝对板块运动才能表明板块在不动的地球空间中的运动速度。对于不随板块运动的观察者，ITRF的速度场是近似的。为了探求绝对运动速度，考虑到非洲板块几乎不动，利用ITRF2000速度数据，研究了相对非洲板块的板块运动，得出了全球主要板块的站速度。结果表明：相对于非洲的板块运动，在一定程度上接近绝对板块运动；南美板块和加勒比板块的ITRF2000运动方向及欧亚板块的ITRF2000运动速率，相对于绝对运动可能有显著偏差。 相似文献
4.
本文通过对扬子古板块西北缘蓝闪片岩及其它高压变质岩石的综合研究,肯定了该区高压变质带的存在,并阐述了高压低温蓝闪片岩带的地质特征,进一步确定了扬子古板块西北缘晋宁——澄江期双变质带的存在,从而为扬子古板块俯冲带和俯冲方向的确定提供了有利的佐征,同时也为阐明扬子古板块西北缘构造演化提供了重要依据。 相似文献
5.
太平洋板块运动和形变及其边缘现今相对运动 总被引：2，自引：1，他引：1
环太平洋构造系是地球的一巨大构造系，集汇聚型、分离型和转换型板块边界于一体，是全球火山、地震最活跃的地带。基于空间大地测量技术长期观测得到的速度场，分析了太平洋板块的运动和形变，并利用空间技术测定太平洋边缘地带转换断层、洋中脊扩张以及海沟边界汇聚与俯冲相对运动速度，获得了太平洋板块及板内的现今运动特征。结果表明：太平洋板块整体以70.1mm/a向西北移动；北太平洋板块具有刚性特征，而南太平洋板块东西向存在拉伸，具非刚性特征。 相似文献
6.
利用海南及邻区1999年以来GNSS资料及1970年以来水准数据获取三维运动速度场，分析地壳运动特征，结合东南亚水平运动背景场分析周缘板块对海南地块及华南地块陆缘速度场的影响。结果表明，海南岛三维运动以白沙断裂为界，岛北部以海口-屯昌为界。华南地块各观测点E向运动速率自西向东逐渐减小，至陆缘区域速率最小，各观测站间运动速率差异性小；S向运动速率自西向东逐渐增大；位于23°～26°N区域观测点的速度场与其南北两侧存在差异。华南地块运动受印度板块与欧亚板块碰撞和挤压影响，陆缘地带还受太平洋板块、菲律宾海板块活动及南海扩张运动影响，澳大利亚板块对区域运动影响较小。 相似文献
7.
空间大地测量测定板块运动的新进展及其与地质学成果的比较 总被引：2，自引：0，他引：2
阐述利用空间大地测量测定和研究板块运动的基本方法、研究成果及最新进展 ,并和地质学方法进行了比较。结果表明 ,用地质学方法与用大地测量方法建立的板块运动模型参数在整体上具有很好的一致性 ,但对某些板块而言两者相差甚大 ,超出了模型误差的范围 ,其中 ,所有大地测量得到的太平洋板块速率都大于地质模型 ,极位置经度都偏小。不同作者利用空间大地测量建立的板块运动模型参数也存在着一定的差异 ,这种差异与所利用的数据类型、板块及其边界划分方案、测站的数量与分布状态及测站取舍的原则有关 ,尤其是与测站的分布及强变形 (非刚性板块运动 )测站的取舍有关。在研究区域性地壳运动时 ,采用不同的板块运动模型将会得到不同的背景场 ,从而会得到不同的区域运动图像 ,因此选择合适的背景场模型是至关重要的。 相似文献
8.
杨福新 《地球科学与环境学报》1989,(3)
本文以研究大陆板块为内容,提出了应用古基底构造来划分大陆板块的新看法。主张在研究板块水平运动时,注重于力偶转换间升降运动的研究;强调两板块间相互关系的研究。主张以活动论的观点,把有用元素的转化迁移作用,作为矿化预测的理论模式。并根据我国陆地板块及其铀矿化控矿特征,为深化研究大陆板块构造进行了初步探索。 相似文献
9.
10.
11.
LIWen－yan PANGXiao－min 《中国地理科学(英文版)》2002,12(2):97-106
Northeast Asia with China ,Japan and South Korea as the main components has drawn more and more atten-tion worldwide.Many scholars have researchec on the prospect of some alternatives of regional economic integration in Northeast Asia/or Yellow Sea Rin as its core area.In this paper the authors start with an introduction of the major arguments embracing Yellow Sea Rim regionalism,and attemptto identify the dynamics challenging the proposed approach-es of sub-regionalism of Northeast Asia.The paper firstly gives a brief review on the undate development of bilateral econom-ic exchanges,mainly Sino-Japanese and Sino-South Korean trades and direct investments with related contemporary is-sues.When the changing pattern of economic interactions is analyzed,special concerns are given to the possibility to real-ize the supposed potential of regional economic cooperation mainly based on economic complementarity among the related regions of China ,North Korea,South Korea,and Japan.The authors then made their major efforts on putting forward possible approaches of multilateral cooperation of three countries in the near future,that is ,deepened cooperation in select-ed sectors of industry and transportation and coordinated development among major cities.The authors stress that the develop-ment of sub-regional sectoral cooperation and the formation of interactive network of city-regions via social and economic interactions at local level are significant to the future regional integrated development in Northeast Asia.. 相似文献
12.
东北亚资源环境综合科学考察数据集成体系的构建 总被引：1，自引：0，他引：1
东北亚区域是一个资源相对集中,生态环境格局复杂,气候地带性多样,人地关系对比显著的区域。集成该区域的资源环境综合科学考察数据,对于支撑全球变化等前沿科学研究和区域可持续发展等具有重要意义。针对该区域数据资源缺乏的现状,研究构建了包括三大体系的东北亚资源环境综合科学考察数据集成系统,即数据资源采集与管理标准规范体系、数据分类体系、数据应用平台软件体系。其中,标准规范体系包括数据采集规范、数据管理规范和综合考察规范3类共23项;数据分类体系包括4个大类、25个小类、128个要素;数据平台软件系统包括数据目录检索管理、元数据管理、数据发布与可视化、数据浏览与获取等5个功能模块;鉴此,用地理信息技术和网络技术,实现了东北亚资源环境综合科学考察数据集成原型系统。目前,已集成144个数据集(库),数据量超过2TB,为东北亚综合科学考察数据的深度集成和应用奠定基础。 相似文献
13.
As the members of Chinese Group of the international cooperative project of "Mineral Resources, Metallogenesis,and Tectonics of Northeast Asia", the authors had the opportunity to review the recent achievement of regional geology in this area. This paper is confined to a brief discussion of the nature, composition and evolution of terranes in a part of Northeast China. Nine terranes were recognized. A splicing pattern of when and how the amalgamation of 9 terranes into one microcontient is proposed here. 相似文献
14.
A robust anomalous anticyclonic circulation (AAC) was observed over Northeast Asia and the Japan Sea in boreal win-ter 1997/98 and over the Japan Sea in spring 1998. The formation mechanism is investigated. On the background of the vertically sheared winter monsoonal flow, anomalous rainfall in the tropical Indo-Western Pacific warm pool excited a wave train towards East Asia in the upper troposphere during boreal winter of 1997/98. The AAC over Northeast Asia and the Japan Sea is part of the wave train of equivalent barotropic structure. The AAC over the Japan Sea persisted from winter to spring and even intensified in spring 1998. The diagnostic calculations show that the vorticity and temperature fluxes by synoptic eddies are an important mechanism for the AAC over the Japan Sea in spring 1998. 相似文献
15.
我国东北地区的自然环境状况一直备受关注,其土地沙化、荒漠化、林地草地退化、森林退化、土地盐碱化等土地环境变化的原因及监测一直是科研的焦点.随着"美丽中国中脊带"的提出,位于该线东北段附近的土地环境相关的研究也不断开展.在涉及该区域土地状况的研究中,常用研究方法有实地考察以及基于遥感卫星影像来进行分析,而本文利用知识图谱... 相似文献
16.
The Changbai Mountains,located in the temperate monsoon climate zone of East Asia,is an ideal loca-tion for the research on timberline response to global changes.In this study,the topsoils were collected from different vertical vegetation zones on the northern slope of the Changbai Mountains,Northeast China in August 2009,and phytoliths in the soil samples were extracted by using wet oxidation method and identified with Motic 2.0 microscope in laboratory.The results show that phytoliths are abundant in the ... 相似文献
17.
To comprehensively understand the law of urban-rural relationship and propose scientific measures of urban-rural coordinated development in Northeast China, this study uses the coupling coordination degree model and geographically and temporally weighted regression(GTWR) model to analyze the spatial-temporal patterns and the corresponding driving mechanisms of its urban-rural coordination since 1990. The results are as follows. First, the urban-rural coupling coordination degree in Northeast China was very low and improved slowly, but its stages of evolution is a good interpretation of the strategic arrangements of China's urbanization.Second, the urban-rural coupling coordination degree in Northeast China had spatial differences and was characterized by central polarization, converging on urban agglomeration, which was high in the south and low in the north. Moreover, the gap between the north and south weakened. Third, the spatial-temporal evolution of the urban-rural coordination relationship in Northeast China was influenced by pulling from the central cities, pushing from rural transformation, and government regulations. The influence intensity of the three mechanisms was weak, but the pulling from the central cities was stronger than that of the other two mechanisms. Furthermore, the spatial difference between the three mechanisms determines the spatial pattern and its evolution of the urban-rural coordination relationship in Northeast China. Fourth, to promote the development of urban-rural coordination in Northeast China, it is essential to advance urbanrural economic correlation, enhance the government's role in regulating and guiding, and adopt different policies for each region in Northeast China. 相似文献
18.
Over the past few years, OSL and TCN datings of glacial material from High Asia have come into fashion. To this day, however,
these techniques do not permit safe calibration. The intensity of the cosmic ray flux is being modulated by the solar and
terrestrial magnetic fields and their secular fluctuations in the past. So far, these variations cannot be converted into
the respective local TCN production rates for High Asia. We have reason to believe that the ages that are being calculated
despite these uncertainties are generally overestimated. This assessment is supported by conventional radiocarbon dates and
above all by the glacial chronology developed independently on the basis of the Quaternary geological method. The strongly
emerging evidence for a much more extensive LGM glaciation of High Asia is, however, either being ignored or rejected by many
authors, solely on the basis of the above-mentioned uncalibrated datings. This self-conceit based on the “dating fallacy”,
as we call it, should be avoided since it goes decidedly against the standards of the scientific method established in Quaternary
geology and makes a fundamental scientific discussion impossible. 相似文献
19.
LONG Jiang-zhi 《中国地理科学(英文版)》2005,15(4):361-367
Strengthening the regional tourism cooperation is the requirement of both tourism development and tourist competition drive. On the one hand, resources, products, market and infrastructure in tourism are characteristics of half-public goods, which are the externalities. On the other hand, tourism competition has evolved from individual scenic spot, or finn competition to regional competition, which also requires urgent regional tourism cooperation. In recent years, the regional economic cooperation has been becoming popular in the world. The triangle tourism zone of Liaoning Province, constituted by Shenyang, Dalian and Dandong, is the core region of Liaoning tourism system. This regional tourism cooperation has been raised for a long time, but has not made substantial progress as yet. In recent years, the strategic cooperation among them has been becoming urgent, along with the change of tourism competition models, as well as the desire for building a Northeast Asia tourist economy circle. Based on literature, this paper establishes a conceptual frame of regional tourism cooperation and applies it in the analysis of the strategic tourism cooperation of Liaoning Province＇s golden triangle zone. This paper firstly examines both qualifications and motives concerning with cooperation among the three cities, and believes that the biggest difficulties involve traditional ideas, administrative institutions, communications, economic performances, time constraints, and more overlap among their tourist markets. Then this paper continues to construct a cooperating mechanism, including participant arrangements, construction of operating mechanism and construction of assisting mechanism. At last, this paper proposes approaches to the strategic cooperation such as introducing Xiuyan County, strategic integration and developing differentiated and complemented tourism products. 相似文献
20.
JINFeng-jun 《中国地理科学(英文版)》2003,13(2):97-103
It is very important to establish cooperative mechanism to guarantee all members to develop their e-conomies in the Yellow Sea Rim. In this paper, the development strategies ofshipplng centers and transportation networkare discussed based on economic giobalization tendency. The results argue that a united transportation network should bebuilt in order to promote the economic competition of Northeast Asia in the world. As a key component of the economiccooperation, a hierarchical shipping centers network should be established with Hong Kong, Shanghai, Pusan, Koho,and Tokyo as cores. The authorities of China, Japan, R. O. Korea and D. P. B. Korea should make more efforts tobuild a set of cooperation institutions based on raising the transportation efficiency. 相似文献