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IASPEI中国委员会 《地震学报》2003,25(5):558-558
国际大地测量与地球物理学联合会 (IUGG)第 2 3届大会 2 0 0 3年 6月 2 9日～ 7月 11日在日本札幌举行 .大会以“行星地球的现状”为主题 ,强调对地球系统过程的多学科综合研究和新技术在地球物理科学中的应用 .IUGG所属的国际大地测量协会 (IAG)、国际地磁学与高空物理学协会 (IAGA)、国际水文科学协会 (IAHS)、国际气象学与大气科学协会 (IAMAS)、国际海洋物理科学协会 (IAPSO)、国际地震学与地球内部物理学协会 (IASPEI)、国际火山学与地球内部化学协会 (IAVCEI)等组织了相应的学术交流活动 .大会安排了 4个主题报告 (U… 相似文献
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中国地震局地球物理研究所 《国际地震动态》2004,(7):40-40
为促进国际科技合作,扩大中国在国际地球科学界的影响,地球物理研究所决定向在地球科学方面做出突出贡献,并对中国地球物理学的发展有重要贡献的国际知名专家,授予中国地震局地球物理研究所荣誉教授(Honorary Professor of the IGCEA)称号。 相似文献
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《地震地质》2006,28(4):690-690
(据中国科学技术信息研究所,中国科技期刊引证报告2006年版)序号按总被引频次排名序号按影响因子排名期刊名称总被引频次期刊名称影响因子1中国沙漠19971中国沙漠1.8702地球物理学报19722地球化学1.8073地学前缘17413天然气地球科学1.5374地球科学进展15854第四纪研究1.3685地球化学13995地学前缘1.3476地球科学13906地球物理学报1.2537第四纪研究12337地球科学进展1.2458地球学报8688干旱区研究1.0799地震工程与工程振动8399大地构造与成矿学1.06510地震学报78310地球科学0.99111地球物理学进展72011灾害学0.90712天然气地球科学71312地球… 相似文献
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《中国科学:地球科学》2013,(1):163-166
《中国科学:地球科学》(中文版)和SCIENCE CHINA:Earth Sciences(英文版)是中国科学院主管、中国科学院和国家自然科学基金委员会共同主办的地球科学类综合性学术刊物,由《中国科学》杂志社出版.旨在报道地质科学、地球化学、地球物理学、地理科学、环境科学、海洋科学、大气科学和空间科 相似文献
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《中国科学:地球科学》2013,(9):1527-1530
《中国科学:地球科学》(中文版)和SCIENCE CHINA:Earth Sciences(英文版)是中国科学院主管、中国科学院和国家自然科学基金委员会共同主办的地球科学类综合性学术刊物,由《中国科学》杂志社出版.旨在报道地质科学、地球化学、地球物理学、地理科学、环境科学、海洋科学、大气科学和空间科 相似文献
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詹志佳 《地震地磁观测与研究》1987,(6)
1919年,由天文学家、地球物理学家和化学家等组织成立了国际研究委员会。为使国际研究委员会具有广泛的国际代表性,1931年将其改组成为国际科学联合委员会(ICSU)。这是一个国际性组织,它由17个科学联合会组成,几乎包括了目前人类所致力的每一个科学研究领域。国际大地测量与地球物理联合会(IUGG)是国际科学联合委员会(ICSU)17个科学联合会中的一个,它跟国际研究委员会同时创建于1919年,IUGG 致力于地球科学研究以及将其成 相似文献
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本文概述了国际大地测量学和地球物理学联合会(IUGG)的发展历史、宗旨及其组织机构和运作体制,介绍了近些年来IUGG在推动地球科学各相关学科的交叉融合、广泛开展国际合作、帮助发展中国家地球科学的发展,以及探讨地球科学未来的趋向,关注青年科学家的培养和成长等方面所开展的卓有成效的活动.这些活动对于人类认识地球、合理利用资... 相似文献
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正中国地球物理学会第29届学术年会于2013年10月13日至15日在云南省昆明市召开.来自国内外1036位代表参加了会议,其中包括中国科学院和中国工程院院士6人及部分海外科学家.10月13日,大会开幕式在昆明市云安会堂会议室隆重举行,学会秘书长郭建主持会议,会议邀请12位科学家做了精彩的大会报告,依次为:(1)中国科学院地质与地球物理研究所刘光鼎院士:"坚持科学发展观,建设中国海";(2)中国台湾"中央研究院"地球科学研究所趙丰 相似文献
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D. M. Pechersky A. A. Lyubushin Z. V. Sharonova 《Izvestiya Physics of the Solid Earth》2010,46(7):613-623
The data on geomagnetic reversals are compared with the changes in the organic world and with the lower-mantle plumes. The
times of the formation of plumes and the times of their appearance on the Earth’s surface relate to the intervals characterized
by the different frequencies of geomagnetic reversals, i.e., there is no interrelation between the formation of plumes and
the frequency of the changes in the geomagnetic field polarity. At the same time, a certain synchronism is observed between
the frequency of the geomagnetic reversals and the boundaries of the biostratigraphic ages, i.e., the changes in the organic
world in the long-period range. A hypothesis is proposed, which explains the change in the sign of the geomagnetic field by
the combined effect of the irregular rotation of the internal core relative to the mantle and the changes in the slope angle
of the axis of the Earth’s rotation, which, in turn, results in synchronous events on the Earth’s surface: the rates of changes
in the organic world. 相似文献
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Prof. Dr. W. A. Heiskanen 《Pure and Applied Geophysics》1958,41(1):1-18
Summary The author mentions the aims of the World-wide gravity project he established in the Ohio State University in Columbus, in 1950. He outlines the practical procedure of the gravimetric computations of the undulationsN and the vertical deflection components and and emphasizes that only by the global international cooperation and additional gravity observations at sea carried out during the last decade it has been possible to gather to Columbus the needed gravity material. Since there exist still large gravimetrically unsurveyed areas it is of vital significance to study what gravity anomalies are best to be used for these regions. The given figures concerning the accuracy of theN, and , estimated theoretically and obtained in practice, indicate that in the gravimetrically well surveyed parts of the world like in Europe and the United States we can get gravimetrically on basis of existing gravity material theN-values with accuracy of about 5–10 meters, and and with the accuracy of about 1. The geoid undulationsN are already computed in Columbus for more than 6000 points of the northern hemisphere. The sample maps show the interesting geoid of Europe and vicinity between the latitudes 60° and 30° and longitude 5° W and 30° E, drafted on basis of more than 1000N-values computed at the corners of 1°×1° squares. It is interesting to realize that the geoid undulations in all this area are positive, the extreme values being between 40 and 50 meters. The geophysical significance of the geoid maps of this kind is pointed out. 相似文献
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Summary The maintenance of the axisymmetric component of the flow in the atmosphere is investigated by means of a steady-state, quasi-geostrophic formulation of the meteorological equations. It is shown that the meridional variations in the time-averaged axisymmetric variables can be expressed as the sum of three contributions, one being due to the eddy heat transport, another to the eddy momentum transport, and a third to the convective-radiative equilibrium temperature which enters the problem through the specification of a Newtonian form of diabatic heating. The contributions by the large scale eddies are evaluated through the use of observed values for the eddy heat and momentum transports.The contributions from each of the three forcing mechanisms to the temperature and zonal wind fields are invstigated individually and found to be of about equal importance. The sum of the three contributions are also presented for the temperature, the zonal wind, the stream function associated with the mean meridional circulation and the corresponding vertical motion. Although the results fail to reproduce the main observed features of the lower stratosphere, they are found to be in good agreement with observations in the middle latitude troposphere. At any pressure level, for example, the computed mean zonal wind has a jet-like profile and the axis of the jet is found to slope to the south with height, as observed in the atmosphere.Based in part on a thesis submitted by the first author as partial fulfillment of the requirements for the Ph.D. degree at the University of Michigan. — Publication No. 194 from the Department of Meteorology and Oceanography, The University of Michigan. 相似文献
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综合APIA、HONOLULU、PAMATAI 3个地磁台三分量的11年周期变化的形态后,可定性地提出该变化源于内场。如内源为核幔边界的电涡流,则其中心点应位于3台之间。 相似文献
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The nutations of the planets Mars andEarth are investigated and compared. Alarge number of interior structureparameters are involved in the nutationcomputations. The comparison between the observations and the computationsprovides several constraints on these parmeters andtherefore allows a better understanding of the physics of the interior of theplanet. For the Earth, the high precision of the observations of the nutationshas led to a very good determination of interior properties of the planet. ForMars, observations of nutations are not yet available, and we review how theamplitude of the Martian nutations depends on the hypotheses consideredfor its interior. Although Mars is very similar to the Earth, its interior is not well known;for example, we don't knowif its core is liquid or solid. Only if the core is liquid,the Free Core Nutation (FCN) normal mode exists and can alter the nutationswhich are close to the resonance. From the observed geoids, it is known thatboth planets are not in hydrostatic equilibrium. The departure is larger forMars than for the Earth, and consequently, the implication of considering a convective mantle instead of a mantle in hydrostatic equilibrium described byClairaut's equation for the initial equilibrium state of the planet is largeron the Martian nutations than on the Earth nutations. The consequences of theuncertainty in the core dimensions are also examined and shown to be of a veryhigh influence for Mars if the core is liquid, due to the potential changes inthe FCN resonance. The influence of the presence of an inner core, which isknown to exist for the Earth, could be more important for Mars than for theEarth if the inner core is large. Due to the presence of Tharsis on Mars, thetriaxiality of this planet has, additionally, larger effects than on Earth. 相似文献
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V. E. Pavlov T. Yu. Tolmacheva R. V. Veselovskiy A. V. Latyshev A. M. Fetisova I. V. Bigun 《Izvestiya Physics of the Solid Earth》2017,53(5):702-713
Until recently, the existing data prevented the geophysicists from accurately dating the Bysy-Yuryakh stratum, which outcrops in the middle reach of the Kotuy River, constraining the time of its formation to a wide interval from the end of the Late Cambrian to the beginning of the Silurian. The obtained paleomagnetic data unambiguously correlate the Bysy-Yuryakh stratum to the Nyaian regional stage and constrain its formation, at least a considerable part of it, by the Tremadocian. This result perfectly agrees with the data on the Bysy-Yuryakh conodonts studied in this work and yields a spectacular example of the successful application of paleomagnetic studies in solving important tasks of stratigraphy and, correspondingly, petroleum geology. Within the Bysy-Yuryakh stratum, we revealed a large normal-polarity interval corresponding to the long (>1 Ma) period when the geomagnetic reversals were absent. This result, in combination with the data for the Tremadocian and Middle–Upper Cambrian sequences of the other regions, indicates that (1) the rate of occurrence of the geomagnetic reversals on the eve of the Ordovician Moyero superchron of reversed polarity was at most one reversal per Ma; (2) the superchron does not switch on instantaneously but is preceded by a certain gradual change in the operation conditions of the dynamo mechanism which, inter alia, manifests itself by the reduction of the frequency of geomagnetic reversals with the approach of the superchron. This finding supports the views according to which a process preparing the establishment of the superchrons takes place at the core–mantle boundary. 相似文献
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The global database on the paleointensity, containing determinations of the virtual dipole moment (VDM) for a stable (normal) regime of the geomagnetic field in a time interval of up to 3.5 Ga, is supplemented by new VDM determinations and analyzed. The field generation process started no later than 3–3.5 Ga (earlier data are absent) at the stage of the Earth’s core formation. Since that time, the dipole value has differed from its present value by no more than an order of magnitude, and the deviations that have already been detected tend toward smaller values. The distribution of VDM values in the time interval 0–400 Ma is bimodal, which apparently reflects the presence of two different generation levels of the geomagnetic field distinguished by a relatively large value (close to the present field value) and a relatively small value (approximately half as large as the present value). The total duration of decreased VDM values appreciably exceeds that of increased VDM values (179.1 and 28.6 Myr, respectively). On the whole, data on the paleointensity do not contradict the hypothesis about the dipole nature of the field over the last 400 Myr; however, the number of determinations at high paleolatitudes is too small to draw decisive conclusions on the validity (or invalidity) of the dipole field approximation based solely on paleointensity data. 相似文献
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A special high-resolution routine of the EISCAT radar has been used to investigate the structure and development of the poleward wall of a deep trough in electron density. The feature was tracked by the radar during a 7-hour period under very quiet geomagnetic conditions. The field-aligned nature of the structure enabled an estimate to be made of the inclination of the geomagnetic field above EISCAT that was in good agreement with the current model. Observations of narrow field-aligned enhancements in electron temperature demonstrated that the wall of this trough is a dynamic feature, reforming regularly as the electron density responds on a time scale of tens of minutes to energy input from soft-particle precipitation. 相似文献