共查询到20条相似文献，搜索用时 64 毫秒
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20 0 1年 1 2月 1 3日由中国地震局组成的验收专家组 ,对新疆地震局地震前兆台站 (网 )技术改造项目进行了验收。地震前兆台站 (网 )技术改造项目是中国地震局“九五”重点项目的内容之一。通过对新疆地震前兆台站数字化改造项目的实施 ,使部分前兆台站的观测环境、工作条件、观测项目综合化、数字化、自动化和标准化程度大为改善。该项目按期完成了 5个台站 2 5个测项的数字化改造及 1个前兆台网中心的建设。在验收过程中专家组对乌鲁木齐基准台、库尔勒台及局台网中心分别进行了技术指标测试。测试结果表明 5个台 2 5个测项及前兆台网中心… 相似文献
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“九五”期间,在中国地震局和江苏省人民政府的大力支持下,江苏省地震局对全省12个台（井）的27个主测项和9个气象三要素辅助测项进行了现代化和数字化建设改造（冯志生等,2001）,同时新建了一个前兆台网中心。改造后主辅测项的每日观测数据被自动收集到前兆台网中心并入库,前兆台网中心人员每日只需对观测数据进行干扰剔除后即可供分析人员直接使用,台站观测实现了无人值守或准无人值守。这一建设改造工作使得江苏 相似文献
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地震前兆数字化遥测台网由多个台站多个手段组网而成，集前兆观测、数据采集、数据传输、数据处理为一体，实现了地震前兆观测数据的及时采集、传送与处理、这些功能的实现都需要安全、稳定、可靠的供电环境做保证。 1 前兆台网对供电的要求 随着“九五”项目和首都圈防震减灾示范工程项目的实施，地震观测技术逐步实现了综合化、数字化、自动化，这是一个系统工程，我们从整个系统可靠工作这个角度，提出了供电系统需要解决的几个问题。 （1）安全可靠的供电：需要解决防雷击和其他原因引起的瞬间高电压冲击的问题。 （2）目前，地震数字… 相似文献
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依托“中国地震数据观测网络”项目,中国地震局地震预测研究所建立了以十三陵地震中心台为前兆台网部,8个无人值守的前兆台站为一体的前兆观测系统。 这套系统利用中国联通的CDMA 1X网络将台站接入到Internet网络,并利用VPN(Virtual Private Network)技术在Internet网络上开辟一条安全、 稳定传输隧道,实现了前兆台站、 观测设备与十三陵前兆台网部的信息集成。 文中以十三陵地震前兆观测系统为例,主要介绍了如何利用CDMA 1X 无线网络和VPN(Virtual Private Network)技术实现前兆观测系统信息集成。 十三陵地震前兆观测系统的正常运行证明,利用CDMA 1X +VPN技术的前兆观测系统组网模式可以做到投资少、 见效快、传输可靠等优势,值得推广应用。 相似文献
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江苏省地震前兆台网中心技术系统的建设 总被引：1，自引：0，他引：1
引言 “九五”期间，江苏省建立了一个较大规模的数字化前兆观测台网。由于该台网实现了数字化，观测数据采样率高，信息量剧增，如何对这些进行有效的管理，使之更好的为地震分析预报及科研服务，成为一个重要的课题。为此，江苏省地震局在“九五”期间组建了地震前兆台网中心，用于汇集和管理各数字化台站的前兆观测数据。 此外，由于大量的模拟前兆观测项目仍然在运行，江苏省地震前兆台网中心按数字化前兆观测的技术规范，对模拟观测数据的存储格式及文件名进行了规范，方便了数字化数据与模拟观测数据的统一管理与对外服务。 1 概况 … 相似文献
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形变标定格值计算软件 总被引：1，自引：1，他引：0
为提高地壳形变观测仪器格值标定的真实性、准确性和可靠性,根据《地震前兆台网运行管理办法》和《地震前兆台网形变观测与运行工作细则》,针对不同测项、不同仪器标定的规范要求及特点,应用Visual Basic语言编制了格值计算软件。本文主要介绍了软件的使用、格值计算、误差检查方法,结果以全国形变台网中心推荐的Word格式保存。对水管仪、水平摆、垂直摆仪直接从原始文件读取数据,提高了标定精度,实现了格值标定的半自动化。本软件已应用于河北省地震前兆数字化台站工作。 相似文献
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分析了广东省地方地震前兆台网在全省地震监测预报中的重要地位和作用以及当前存在的主要问题;论述了台网优化改造的重要意义。按照中国地震局“九五”重点项目《地震前兆台站的技术改造》的要求,提出了优化改造的技术方案。广东省地方震前兆观测项目以地下流体综合观测为主,在地震重点监视防御区新建２０个数字化、自动化地下流体综合观测站,观测数据通过有线ＭＯＤＥＭ和程序电话自动传递到地方地震部门和省局区域台网中心,实 相似文献
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试论"十五"期间我国地震地下流体前兆台网的优化与建设问题 总被引：9，自引：2，他引：7
根据我国地震地下流体前兆台网的现状、“九五”台站建设取得的进展与存在的问题,提出“十五”期间有关台网优化与建设方面的如下工作建议：（1）优化现有的台网;（2）完善与推广数字化观测技术,力争使经过数字化改造的台站数量由100个扩展到300个,实现数字化观测的台项由300个增加到10000个,基本实现我国流体前兆观测技术的现代化;（3）建设以地震监测与预测研究为目的前兆实验场。（4）建成地下流体学科技术中心;（5）建设重大工程的地震安全性监测系统。 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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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 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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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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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... 相似文献