University of Birmingham Using broadband seismic networks to optimise microgravity survey strategy in the UK
University of Birmingham Using broadband seismic networks to optimise microgravity survey strategy in the UK
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伯明翰大学利用宽带地震台网优化英国微重力勘测策略
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
D. Chapman
中科院分区：
文献类型：
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作者：
Y. Goncharenko;D. Boddice;A. Rodgers;P. Atkins;N. Metje;D. Chapman
微重力测量是检测地下特征的有用工具，特别是深层目标或导电地面中的目标，这些目标超出了基于电磁信号传输的其他方法的能力。然而，该方法受到一系列噪声源的限制，包括来自环境的振动噪声，其中一个源来自海浪引起的微震噪声。这种噪音穿过基岩并在数据中显现出来。它随着时间和地点的变化而变化。在英国，首次使用场重力计 (Scintrex CG5) 评估了波浪噪声对微重力测量的影响，并证明了微重力测量噪声与宽带地震计噪声之间的联系。因此，提出了一种评估这种噪声对英国微重力测量影响的新方法，该方法使用英国地质调查局 (BGS) 运行的连续监测地震网络中的现成数据来创建准确的临近预报。勘测当天的噪声知识与预期目标的近似信号强度相结合，可用于显着改进勘测规划，确定对特定目标进行勘测的最佳观测时间，从而节省失败的微重力勘测的时间和金钱。
Microgravity measurements are a useful tool for detecting subsurface features, especially deep targets or those in conductive ground which lie outside the capabilities of other methods based on electromagnetic signal transmission. However, the method is limited by a range of noise sources including vibrational noise from the environment, one source of which comes from microseism noise due to ocean waves. This noise travels through the bedrock and manifests itself in the data. It varies as a function of time and location. The effect of the wave noise on microgravity measurements in the UK was assessed for the first time using a field gravimeter (Scintrex CG5) and a link was demonstrated between the noise from microgravity measurements and those from a broadband seismometer. As a result, a new method for assessing the impact of this noise on microgravity measurements in the UK is proposed using readily available data from the continuously monitoring seismic network run by the British Geological Survey (BGS) to create an accurate nowcast. Knowledge of this noise on the day of survey in conjunction with an approximate signal strength of the expected targets can be used to significantly improve survey planning in terms of the optimal observation time at which surveys for particular targets should be conducted, saving time and money on failed microgravity surveys.