共查询到17条相似文献,搜索用时 156 毫秒
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国际上对绝对重力测量日益重视 ,在原先国际大地测量协会 (ICAG)下设立绝对重力仪比对工作研究小组 (SGCAG :StudyGrouponComparisonsofAbsoluteGravimeters)的基础上 ,国际计量委员会 (CIPM)也于 2 0 0 2年在其质量及其相关量咨询委员会 (CCM)下设立了重力测定工作组 (WGG :WorkingGrouponGravimetry)。其中SGCAG主要负责组织每四年一次的国际重力仪比对 ,CCM WGG主要负责组织区域性国际重力仪比对以及制定重力测定相关技术协议和标准规范。这两个小组的主席均是Dr .LeonidVitushkin。SGCAG和CCM WGG这两个工作组于 2… 相似文献
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1983年8月儿日至13日在西德汉堡举行了第十一届国际重力委员会(简称IGC),IGC会上集中总结、研究了世界各国的精密重力测量及各种重力仪的性能情况,会上布郎什(Boulanger)教授和国际计量局绝对重力仪的研究者佐久间博士全面介绍了各国绝对重力仪在国际计量局(简称BIPM)的比对结果及装置情况。从总结介绍的结果看,参加比对国家的仪器在BIPM比测结果是良好的,所测得的差值 相似文献
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本文述评了各国绝对重力仪过去历次国际比对结果,并对今后国际大比对提出某些建议。 相似文献
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中国计量科学研究院于1983年开始设计研究中国第二代可移式激光绝对重力仪(NIM-Ⅱ型),1985年完成实验装置,并参加在法国巴黎举行的第二次国际绝对重力仪比对活动,1987年完成全部研究工作计划.本文较详细地阐述了近4年来在全国大面积实施绝对重力观测的结果.尤其在北京香山地震台,为了探索微重力观测研究,已建立了4个绝对重力点,开展了重力纵向垂直梯度、横向水平点位差及随时间变化的绝对重力观测研究.多年来为地震研究、地球物理研究及测绘、计量、国防等部门积累了一批绝对观测数据资料.这些基础性观测工作,对今后研究重力的非潮汐变化也有重要的意义. 相似文献
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Creation of a seismic-gravimetric complex that can operate automatically for several years allows one to record the movements
of the test masses of seismometers and gravimeters simultaneously in different frequency bands. The overlapping of these frequencies
takes place in the region of tenths of a Hertz. The seismic-gravimetric complex contains two relative CG-5 gravimeters, one
absolute A10 gravimeter, one three-component Ugra seismic station, one automatic meteorological station, and a two-frequency
GPS receiver. The relative gravimeters are used as the basic instrument. For these devices the problem of displacement of
the gravimeter scale “zero” was solved. To perform long-term monitoring observations using the seismic-gravimetric complex,
a gravimetric observatory was built in the area with a low level of technogenic noises. As a result of the preliminary geophysical
observations, it turned out that the informative parameter is a root-mean-square deviation of the measured gravity force values. 相似文献
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中国第二代可移激光绝对重力仪(NIM-Ⅱ型)的实验装置于1985年研制成功。本文详细论述了仪器的多位置法原理及仪器结构;具体分析说明了仪器的光学系统,电子精密测时系统,数据处理系统;研究了一种处理地面微震干扰的新方法。参加1985年在法国巴黎举行的第二次国际绝对重力仪比对结果表明,该装置的测量结果不确定度为1.4x10-7m/s2。国际比对后,仪器又做了进一步改进。经国内大面积测量应用的结果表明,该装置的不确定度可达1×10-7m/s2。 相似文献
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F. Greco G. Currenti G. D’Agostino A. Germak R. Napoli A. Pistorio C. Del Negro 《Bulletin of Volcanology》2012,74(7):1745-1756
To achieve a balance between uncertainty and efficiency in gravity measurements, we have investigated the applicability of combined measurements of absolute and relative gravity as a hybrid method for volcano monitoring. Between 2007 and 2009, three hybrid gravity surveys were conducted at Mt Etna volcano, in June 2007, July 2008, and July 2009. Absolute gravity data were collected with two absolute gravimeters, which represent the state of the art in recent advances in ballistic gravimeter technology: (1) the commercial instrument FG5#238 and (2) the prototype instrument IMGC-02. We carried out several field surveys and confirmed that both the absolute gravimeters can still achieve a 10 μGal or better uncertainty even when they are operated in severe environmental conditions. The use of absolute gravimeters in a field survey of the summit area of Mt Etna is unprecedented. The annual changes of the gravity measured over 2007–2008 and 2008–2009 provide unequivocal evidence that during the 2007–2009 period, two main phenomena of subsurface mass redistribution occurred in distinct sectors of the volcano, accompanying different eruptive episodes. From 2007 to 2008, a gravity change of ?60?μGal was concentrated around the North-East Rift. This coincided with a zone affected by strong extensional tectonics, and hence might have been related to the opening of new voids. Between 2008 and 2009, a North-South elongate feature with a maximum gravity change of +80?μGal was identified in the summit craters area. This is interpreted to indicate recharge of a deep-intermediate magma storage zone, which could have occurred when the 2008–2009 eruption was still ongoing. 相似文献
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The synthetic tidal parameters with high spatial resolution for gravity over China and its neighbor area are con- structed with Earth’s tidal model and ocean tide loading calculated using TPXO7 global ocean tide model as well as tidal data over China seas. The comparison between synthetic parameters and ones observed by spring gravime- ters at some seismic network stations and Hong Kong station and one observed by super-conducting gravimeter at Wuhan station shows that the average differences in amplitude factors and phases are smaller than 0.005 and 0.5° respectively; and that the discrepancies between observational and synthetic parameters are dependent on gravim- etric technique in that the synthetic parameters are in well agreement with the superconducting gravimetric obser- vations. This also indicates that the synthetic result is a good estimation for tidal gravity, and the numerical results in the present paper not only can provide ground and space gravimetry such as absolute gravimetry with correction model of tidal gravity, but also provide effective tidal parameters over areas where no observation is carried out. 相似文献