基于网络技术的测震系统在市县地震部门的应用

介绍了基于网络技术的测震系统在市县地震部门的应用,从一个侧面反映出安徽＂十五＂数字测震台网建设的显著成效。基于网络技术的测震系统成功推广,不仅扩大了市县地震部门的业务范围,完善其监测预报体系建设,而且提高了市县地震部门的地震监测能力和地震研究水平,提升了市县地震部门在各级政府的影响力和社会显示度。     

地震应急救援差异性查询平台设计与实现

本文系统介绍了地震应急救援差异性查询平台的设计思路,包括多源数据处理与集成方法、查询方式与结果展示方式设计、系统架构设计、功能模块设计和关键技术等内容。地震应急救援差异性查询平台将来源于不同部门的影响我国地震应急救援能力的各类因素数据纳入到统一的管理平台,向各级政府、不同部门和相关地震应急人员提供便捷直观的信息查询服务,建立部门之间信息共享的桥梁,有效缓解了部门之间数据孤立的壁垒。     

一场硬战，需要哪些“文臣武将”的辅助

日前,国务院常务会议决定,建立不动产统一登记制度,将分散在多个部门的不动产登记职责整合由一个部门承担。这将是中国不动产登记制度的重大突破。     

加强地方地震工作的重要性

结合龙岩市防震减灾工作的实际,分析地方地震部门所具有的社会职能,并从宏观职能、微观职能、联合职能、管理职能4个方面进行探讨,说明地方地震部门应正确行使职能,提出加强地方地震工作的重要性。     

地学书签

何为“天地图” “天地图”为国家测绘地理信息局旗下的地理信息服务网站,于2010年10月21日正式开通,是目前中国区域内数据资源最全的同类网站,集成了全国各级测绘部门和相关企业、专业部门的地理信息资源。     

中国地球物理学会第七届重力学与固体潮学术讨论会在郑州召开

中国地球物理学会第七届重力学与固体潮学术讨论会在郑州召开中国地球物理学会第七届重力学与固体潮学术讨论会于１９９４年１０月７—１０日在郑州召开，来自中国科学院、高等院校、地震部门、海洋部门、测绘部门以及解放军测绘部队等２７个单位的６３名代表参加了会议。...     

紧扣新农村建设主题积极实施农村民居地震安全工程

近年来，咸阳市的防震减灾工作在市委、市政府的领导和省地震局的指导下，充分发挥市（县）地震、城建等部门的作用，加强农村房屋建筑抗震设防的指导和管理，积极推进“农村民居地震安全工程”，在新农村建设中发挥了地震部门应有的作用。     

浅谈如何加强国土部门学习型党建工作

正近年来,江西省国土资源厅党组以党建保发展、以党建促管理、以党建带队伍,充分发挥党组织的战斗堡垒作用。当前,国土资源部门"保发展、保红线"责任重大,使命光荣,这迫切需要国土资源部门加强党组织建设,进一步解放思想,树立科学、依法管地理念,正确     

省级地震部门地震安全性评价强制性评估事项研究与行政管理对策

为贯彻落实国务院行政审批事项改革要求,深化防震减灾事业改革,适应经济社会发展要求,对地震部门在新形势下如何加强地震安全性评价工作进行了深入调研和探索。通过对地震安全性评价改革过程的梳理和对相关部门强制性评估事项现状及政策的调研,分析了强制性评估事项的形势和特征,对地震部门地震安全强制性评估事项的后续管理提出了对策建议。     

自治区人大教科文卫联系会议在乌鲁木齐举行

１９９９年元月７日,自治区人大教科文卫委员会召开教科文卫部门法规工作联系会议。自治区教委、文化厅、科委、卫生厅、地震局等１３个部门办公室（法规处）的负责人参加了会议。自治区人大副主任胡吉汉·哈克莫夫出席了会议并讲话。他指出：自治区人大将大力支持各部门的立法和执法检查工作,各部门立法项目该出台的就出台,实在有困难,先列入立法项目论证计划,以政府规章形式出台,试行几年后,在成熟的基础上,再提交自治区人大,以法规形式出台。新疆地震局参加会议的负责同志在会上汇报了１９９８年自治区在防震减灾工作方面的立法…     

On the synchronism in the events within the core and on the surface of the earth: the changes in the organic world and in the polarity of the geomagnetic field in the phanerozoic

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.     

On the maintenance of the axisymmetric part of the flow in the atmosphere

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.     

On the gravimetric undulations of the geoid and the deflections of the vertical

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.     

太平洋中部地磁台11年周期变化的研究

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。     

On the variation in the geomagnetic dipole over the geological history of the Earth

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.     

Magnetic stratigraphy of the Ordovician in the lower reach of the Kotuy River: the age of the Bysy-Yuryakh stratum and the rate of geomagnetic reversals on the eve of the superchron

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.     

Comparison Between the Nutations of the Planet Mars and the Nutations of the Earth

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.     

Evolutionary Changes in the Configuration of the Magnetic Field of the Solar Corona in the Epoch of the Minimum

Geomagnetism and Aeronomy - The evolution of the magnetic configuration in the solar corona is studied. The curvature of the K-corona helmets obtained from an analytical approximation of the...