Using broadband seismic networks to optimize microgravity survey strategy in the United Kingdom
Using broadband seismic networks to optimize microgravity survey strategy in the United Kingdom
复制标题
使用宽带地震台网优化英国的微重力勘测策略
DOI：
10.1002/nsg.12007
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发表时间：
2018
影响因子：
1.6
通讯作者：
Goncharenko Y
中科院分区：
文献类型：
--
作者：
Goncharenko Y
微重力测量是探测地下特征的一个有用工具，特别是探测深层目标或位于导电地面中的目标，这些目标超出了基于电磁信号传输的其他方法的能力范围。然而，该方法受到包括来自环境的振动噪声的噪声源的范围的限制，其中一个源是由于海浪引起的微震噪声。这种噪音通过基岩传播，并在数据中表现出来。它随时间和地点而变化。在联合王国，首次使用野外重力仪（Scintrex CG 5）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频带地震仪噪声之间的联系。因此，提出了一种新的方法，用于评估这种噪音对联合王国微重力测量的影响，该方法利用英国地质调查局运行的连续监测地震网络提供的现成数据，以创建准确的临近预报。在测量当天了解这种噪声，再加上预期目标的大致信号强度，可大大改进测量规划，确定对特定目标进行测量的最佳观测时间，从而在微重力测量失败时节省时间和金钱。
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 being the 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 United Kingdom 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 United Kingdom is proposed using readily available data from the continuously monitoring seismic network run by the British Geological Survey 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.