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DOI: 10.1002/2015GL066126
论文题名:
High-frequency seismic noise generated from breaking shallow water ocean waves and the link to time-variable sea states
作者: Poppeliers C.; Mallinson D.
刊名: Geophysical Research Letters
ISSN: 0094-9463
EISSN: 1944-9194
出版年: 2015
卷: 42, 期:20
起始页码: 8563
结束页码: 8569
语种: 英语
英文关键词: breaking waves ; nearshore ; seismology
Scopus关键词: Beaches ; Ocean currents ; Oceanography ; Power spectral density ; Sediment transport ; Spectral density ; Water waves ; Breaking waves ; Broad-band seismometers ; Lower frequencies ; Nearshores ; Plunging breakers ; Sediment movement ; Seismic observation ; Spectral amplitude ; Seismology ; breaking wave ; correlation ; frequency analysis ; nearshore dynamics ; sea state ; seismic noise ; seismograph ; seismology ; shallow water ; spectral analysis ; surf zone
英文摘要: Breaking waves in the nearshore are known to generate a significant amount of high-frequency (f > 5 Hz) energy. We investigate the correlation between the spectrum of seismic energy and the local sea states. We deployed a single three-component broadband seismometer approximately 50 m from the seashore and recorded continuously for approximately 10 days. Our observations show that during elevated sea states, and presumably larger breaking waves in the surf zone, the power spectral density of the wave-generated seismic energy shifts to lower frequencies and higher spectral amplitudes. This is similar to the observation that large plunging breakers generate 1-20 Hz acoustic infrasound, suggesting that a significant portion of the infrasound couples into seismic energy at the water/sea floor interface. Based on our observations and previous models, it appears that the seismic spectrum is sensitive to the wave size but not sediment movement. Regardless, the correlation of the seismic spectral power to the height and period of ocean waves suggests that seismic observations can be used as a proxy for local sea states, which may have implications for seashore sediment transport. Key Points Seismic spectra linked to size of breaking waves Potential to invert seismic spectra for breaker size/power Potential to invert seismic spectra for erosive power of surf © 2015. American Geophysical Union. All Rights Reserved.
URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946605450&doi=10.1002%2f2015GL066126&partnerID=40&md5=8a651951a15e35a0f90510d069716062
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9078
Appears in Collections:科学计划与规划
气候变化与战略

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作者单位: Department of Geological Sciences, East Carolina University, Greenville, NC, United States

Recommended Citation:
Poppeliers C.,Mallinson D.. High-frequency seismic noise generated from breaking shallow water ocean waves and the link to time-variable sea states[J]. Geophysical Research Letters,2015-01-01,42(20).
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