ROMY: a multicomponent ring laser for geodesy and geophysics
ROMY: a multicomponent ring laser for geodesy and geophysics
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DOI：
10.1093/gji/ggaa614
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发表时间：
2021-02-15
影响因子：
2.8
通讯作者：
Wells, Jon-Paul R.
中科院分区：
文献类型：
--
作者：
Igel, Heiner;Schreiber, Karl Ulrich;Wells, Jon-Paul R.
单分量环形激光器提供了高分辨率的地球自转速率观测，以及局部地震或其他诱发的旋转地面运动。在这里，我们介绍了安装在德国慕尼黑附近的地球物理观测站Furstenfeldbruck的四组件四面体环形激光器ROMY的设计、建造和操作方面。四个边长为12米的等边三角形环形激光器提供旋转运动，可以结合起来以非常高的分辨率从一个点测量构建地球旋转的完整矢量。结合经典的宽带地震仪，我们获得了迄今为止最精确的6自由度地面运动测量系统，使本地和远震观测以及海洋产生的洛夫波和瑞利波的分析成为可能。讨论了具体的设计和建造细节，以及由此产生的长期观察结果。我们提出了局部、区域和全球地震的地震观测，以及海洋产生的旋转噪声的季节变化。讨论了当前的极运动分辨率，并提出了进一步提高多分量环形激光系统长期稳定性的策略。
Single-component ring lasers have provided high-resolution observations of Earth's rotation rate as well as local earthquake- or otherwise-induced rotational ground motions. Here, we present the design, construction and operational aspects of ROMY, a four-component, tetrahedral-shaped ring laser installed at the Geophysical Observatory Furstenfeldbruck near Munich, Germany. Four equilateral, triangular-shaped ring lasers with 12 m side length provide rotational motions that can be combined to construct the complete vector of Earth's rotation from a point measurement with very high resolution. Combined with a classic broad-band seismometer, we obtain the most accurate 6 degree-of-freedom ground motion measurement system to date, enabling local and teleseismic observations as well as the analysis of ocean-generated Love and Rayleigh waves. The specific design and construction details are discussed as are the resulting consequences for permanent observations. We present seismic observations of local, regional and global earthquakes as well as seasonal variations of ocean-generated rotation noise. The current resolution of polar motion is discussed and strategies how to further improve long-term stability of the multicomponent ring laser system are presented.