globalchange  > 气候减缓与适应
DOI: 10.1002/2017JE005332
Scopus记录号: 2-s2.0-85041083683
论文题名:
Expected Seismicity and the Seismic Noise Environment of Europa
作者: Panning M.P.; Stähler S.C.; Huang H.-H.; Vance S.D.; Kedar S.; Tsai V.C.; Pike W.T.; Lorenz R.D.
刊名: Journal of Geophysical Research: Planets
ISSN: 21699097
出版年: 2018
卷: 123, 期:1
起始页码: 163
结束页码: 179
语种: 英语
英文关键词: Europa ; noise ; seismicity ; seismology
Scopus关键词: autocorrelation ; energy dissipation ; Europa ; Jupiter ; seismic data ; seismic moment ; seismic noise ; seismicity ; wave propagation
英文摘要: Seismic data will be a vital geophysical constraint on internal structure of Europa if we land instruments on the surface. Quantifying expected seismic activity on Europa both in terms of large, recognizable signals and ambient background noise is important for understanding dynamics of the moon, as well as interpretation of potential future data. Seismic energy sources will likely include cracking in the ice shell and turbulent motion in the oceans. We define a range of models of seismic activity in Europa's ice shell by assuming each model follows a Gutenberg-Richter relationship with varying parameters. A range of cumulative seismic moment release between 1016 and 1018 Nm/yr is defined by scaling tidal dissipation energy to tectonic events on the Earth's moon. Random catalogs are generated and used to create synthetic continuous noise records through numerical wave propagation in thermodynamically self-consistent models of the interior structure of Europa. Spectral characteristics of the noise are calculated by determining probabilistic power spectral densities of the synthetic records. While the range of seismicity models predicts noise levels that vary by 80 dB, we show that most noise estimates are below the self-noise floor of high-frequency geophones but may be recorded by more sensitive instruments. The largest expected signals exceed background noise by ∼50 dB. Noise records may allow for constraints on interior structure through autocorrelation. Models of seismic noise generated by pressure variations at the base of the ice shell due to turbulent motions in the subsurface ocean may also generate observable seismic noise. ©2017. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114813
Appears in Collections:气候减缓与适应

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作者单位: Department of Geological Sciences, University of Florida, Gainesville, FL, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; Institute of Geophysics, ETH Zürich, Zürich, Switzerland; Leibniz-Institute for Baltic Sea Research (IOW), Rostock, Germany; Seismological Laboratory, California Institute of Technology, Pasadena, CA, United States; Now at Institute of Earth Sciences, Academia Sinica, Taipei, Taiwan; Department of Electrical and Electronic Engineering, Imperial College, London, United Kingdom; Space Exploration Sector, The Johns Hopkins Applied Physics Laboratory, Laurel, MD, United States

Recommended Citation:
Panning M.P.,Stähler S.C.,Huang H.-H.,et al. Expected Seismicity and the Seismic Noise Environment of Europa[J]. Journal of Geophysical Research: Planets,2018-01-01,123(1)
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