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前言遥测台网要快速、准确地完成地震速报 ,除了需要必要的硬件支持外 ,一个适合本地区特点的地震速报软件是非常重要的。在全国地震系统中运用的地震速报软件已有不少 ,但使用过程中发现一些不够完善和需要解决的情形 :如震中地名的自动检索 ,交切图的任意放大缩小 ,适合本地区的走时表 ,以及有人值守台站数据和数字台网数据共一个平台以及两个半台定位等。基于上述问题我们自行研制了合肥遥测台网地震速报 ( DZSB)软件。1 DZSB软件基本原理和特点DZSB是基于港震公司的 Wave View交互处理软件的基础来实现两项功能 :1由局域网直接读… 相似文献
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本文对《陕西省志.地震志》、《中国地震历史资料汇编》(第一卷)有关陕西几次历史地震震中位置作了匡定。认为公元前32年(汉成帝建始元年九月)发生的地震,原定震中在绥德东南25千米不确,应在榆林市东南30千米的王沙坬村。对公元477年6月(北魏孝文帝太和元年五月)发生在统万镇的地震,指出参考震中既不在横山北,也非内蒙古乌审旗南,而是在陕西省靖边县东北的红墩界乡。对公元1650年9月(清世祖顺治七年八月)和公元1813年7月(清仁宗嘉庆十八年六月)两次地震的参考震中,指出安定现属子长县。 相似文献
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李鸿庭 《地震地磁观测与研究》2019,40(6):146-151
地震信息是地震发生的时间、震级、震中参考地名等信息。地震信息的快速准确发布,可以进一步提高地震应急救援反应能力,满足广大社会公众对地震信息的了解。地震信息的快速发布和获取能有效提高防震减灾效果,介绍基于NetSeis/IP协议地震信息自动发布方法及地震信息自动发布软件Autosms,对系统时效性进行测试,结果表明,基于NetSeis/IP协议的信息发布软件延时小,发送速度快,尤其大批量短信发布,时效性更高,可实现震情的快速发布。 相似文献
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快速准确地自动检索地名的一种方法 总被引：1，自引：1，他引：0
快速准确地自动检索地名的一种方法何少林１）李海亮２）肖军１）１）中国兰州７３００００中国地震局兰州地震研究所２）中国北京１０００８１中国地震局地球物理研究所中国地震台及地震台网每年记录到可定位的地震几千条,对每条地震都需要给出震中地名。以往查找地名大... 相似文献
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1505年10月9日6(3/4)级地震震中原订在黄海(32.8°N,122.7°E)。1983年以后,因苏南、泰山核电站选址和上海地震烈度复核需要,有人对原定震中提出怀疑,并进行部分修正。我们对1505年地震震中做了考证研究,主要根据地震史料,同时也考虑同期历史地震分布、现代微小地震条带、构造地貌、活动构造和深部构造,建议将1505年6(3/4)级地震震中南移到长江口(30.9°N,122.7°E),并称为1505年长江口6(3/4)级地震。 相似文献
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2002年8月8日在四川省新龙县通宵乡-友谊乡-带发生一次Ms5．3级地震，震中烈度为Ⅶ度。地震造成新龙、白玉、理塘三个县的13个乡(镇)不同程度的灾害，重灾区面积约200平方千米；轻灾区面积约为700平方千米，受灾人口5525户，共30524人。地震造成的经济损失约3034万元。 相似文献
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RASP 包含在震中联合数据光盘(CD—ROM)中的震源参数数据库检索软件。概述震源参数数据库(SOPAR)是存放在震中联合数据光盘(CD—ROM)中的两个数据库中的第二个,它包括了发生在1977年1月到1989年3月之间的5671个天然地震资料和各种断层面、地震矩和辐射能量解。 相似文献
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2004年5月28日12时38分46秒(国际时),伊朗中北部发生了强烈地震。据德黑兰大学地球物理学研究所测定,此次地震的震级为里氏5．5级,震中位于马赞达兰省恰卢斯市郊区的巴拉代镇。美国国家地震信息中心(NEIC)公布的结果为：震中位于 相似文献
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震中参考地名的确定是地震速报工作不可缺少的环节,在Google地图中以KML格式提取和存储新疆周边国家和地区边界坐标数据,利用Delphi语言和天地图API相关技术,开发新疆境外震中参考地名的查询软件,从而可以快速确定新疆周边国家和地区的参考地名,使得境外地震速报的地名准确性和速度得到明显提高。 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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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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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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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