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DOI | 10.1002/2017GL074892 |
First Observation of the Earth's Permanent Free Oscillations on Ocean Bottom Seismometers | |
Deen, M.1; Wielandt, E.2; Stutzmann, E.1; Crawford, W.1; Barruol, G.1,3; Sigloch, K.4 | |
2017-11-16 | |
发表期刊 | GEOPHYSICAL RESEARCH LETTERS |
ISSN | 0094-8276 |
EISSN | 1944-8007 |
出版年 | 2017 |
卷号 | 44期号:21 |
文章类型 | Article |
语种 | 英语 |
国家 | France; Germany; England |
英文摘要 | The Earth's hum is the permanent free oscillations of the Earth recorded in the absence of earthquakes, at periods above 30s. We present the first observations of its fundamental spheroidal eigenmodes on broadband ocean bottom seismometers (OBSs) in the Indian Ocean. At the ocean bottom, the effects of ocean infragravity waves (compliance) and seafloor currents (tilt) overshadow the hum. In our experiment, data are also affected by electronic glitches. We remove these signals from the seismic trace by subtracting average glitch signals; performing a linear regression; and using frequency-dependent response functions between pressure, horizontal, and vertical seismic components. This reduces the long period noise on the OBS to the level of a good land station. Finally, by windowing the autocorrelation to include only the direct arrival, the first and second orbits around the Earth, and by calculating its Fourier transform, we clearly observe the eigenmodes at the ocean bottom. |
英文关键词 | hum noise continuous oscillations broadband ocean bottom seismology surface waves glitch |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000418572900004 |
WOS关键词 | BROAD-BAND SEISMOLOGY ; SEA-FLOOR ; INCESSANT EXCITATION ; PILOT EXPERIMENT ; NOISE-REDUCTION ; GEOSCOPE ; WAVES ; MOISE |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/25502 |
专题 | 气候变化 |
作者单位 | 1.Sorbonne Paris Cite, Inst Phys Globe Paris, Paris, France; 2.Univ Stuttgart, Inst Geophys, Stuttgart, Germany; 3.Univ Paris Diderot, Univ La Reunion, Sorbonne Paris Cite,CNRS, Inst Phys Globe Paris,Lab GeoSci Reunion,UMR7154, St Denis, Reunion, France; 4.Univ Oxford, Dept Earth Sci, Oxford, England |
推荐引用方式 GB/T 7714 | Deen, M.,Wielandt, E.,Stutzmann, E.,et al. First Observation of the Earth's Permanent Free Oscillations on Ocean Bottom Seismometers[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(21). |
APA | Deen, M.,Wielandt, E.,Stutzmann, E.,Crawford, W.,Barruol, G.,&Sigloch, K..(2017).First Observation of the Earth's Permanent Free Oscillations on Ocean Bottom Seismometers.GEOPHYSICAL RESEARCH LETTERS,44(21). |
MLA | Deen, M.,et al."First Observation of the Earth's Permanent Free Oscillations on Ocean Bottom Seismometers".GEOPHYSICAL RESEARCH LETTERS 44.21(2017). |
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