Micro-Gravity Measurements in Northern Victoria-Land, Antarctica: A Feasibility Study

Micro-Gravity Measurements in Northern Victoria-Land, Antarctica: A Feasibility Study
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南极洲维多利亚州北部地区的微重力测量:可行性研究

DOI:
10.1007/978-3-642-37222-3_57
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发表时间:
2014
期刊:
影响因子:
--
通讯作者:
A. Zanutta
A. Zanutta
中科院分区:
--
文献类型:
--
作者:
Jentzsch;R. Ricker;A. Weise;M. Capra;M. Dubbini;A. Zanutta

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在意大利南极研究方案范围内,正在南极洲维多利亚州北部陆地地区安装良好的地点进行重复的GPS测量,该区域被称为维多利亚陆地形变控制网络。虽然4年来得到的形变很小,但我们认为微重力测量是地球动力学研究的一个合适的补充。由于德国联邦地球科学和自然资源研究所(BGR)在该地区也很活跃,直到2010年进行了九次探险,包括地质和地球物理工作,我们利用这一提议在2009/2010赛季加入了GANOVEX探险队。用三台重力仪观测了德国冈瓦那站附近意大利网点的13个点。这种测量的优点是它们不需要地形改正。因此,仪器分辨率和测量条件分别是测量分辨率和精度的极限。为了得到可靠的数据库,我们同时使用了三台刻度良好的重力仪,并多次重复测量。冰盖变化和降雪引起的局部影响低于达到的测量精度,因为这些点暴露得很严重,局部影响可以忽略不计。尽管2,700米以上的高程差相当大,但结果表明这些测量在该地区是可行的:获得的标准偏差在±10到±20μGal的数量级。
Within the Italian Antarctic research programme repeated GPS-measurements are being carried out at well installed points in the area of Northern-Victoria-Land (NVL), Antarctica, called VLNDEF: Victoria Land Network for Deformation Control. Although the deformations obtained over a period of 4 years are quite small we consider micro-gravity measurement a suitable complement for geodynamic research. Since the German Federal Institute for Geosciences and Natural Resources (BGR) is active in that area as well, until the year 2010 performing nine expeditions comprising geological and geophysical work, we used the offer to join expedition GANOVEX X during the season 2009/2010. With three gravimeters 13 points of the Italian network near the German station Gondwana were observed. The advantage of such measurements is that they do not require topographic corrections. Thus, the instrumental resolution and the measurement conditions, resp., are the limits for the resolution and accuracy of the measurements. In order to receive a reliable data base we used three well calibrated gravimeters in parallel and repeated the measurements several times. Local effects due to changes of the ice cover and snow fall are below the achieved measurement accuracy, because the points are so exposed that local effects are negligible. Although the elevation differences up to more than 2,700 m are quite strong, the results reveal the feasibility of these measurements in that area: The obtained standard deviations are in the order of ±10 to ±20 μGal.
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发表时间: 2008
影响因子: 3.9
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发表时间: 2009
期刊:
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通过 GPS 数据和地质环境的整合推断出维多利亚州北部地区(南极洲)的活动构造。
DOI: --
发表时间: 2010
期刊:
影响因子: --
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DOI: --
发表时间: 2004
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