| DOI: | 10.1002/2014GL061383
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| 论文题名: | Seismic reflectivity effects from seasonal seafloor temperature variation |
| 作者: | Wood W.T.; Martin K.M.; Jung W.; Sample J.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9730
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| EISSN: | 1944-9461
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| 出版年: | 2014
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| 卷: | 41, 期:19 | | 起始页码: | 6826
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| 结束页码: | 6832
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| 语种: | 英语
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| 英文关键词: | amplitude versus angle
; sediment properties
; seismic inversion
; seismic reflectivity
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| Scopus关键词: | Reflection
; Sediments
; Temperature
; Temperature control
; Temperature distribution
; Ultrasonic velocity measurement
; Acoustic transmission
; Amplitude versus angle
; Seasonal temperature variations
; Sediment properties
; Seismic inversion
; Seismic reflectivity
; Sinusoidal temperature
; Temperature variation
; Seismology
; coastal zone
; frequency analysis
; oscillation
; seafloor mapping
; seasonal variation
; seismic data
; seismic reflection
; simulation
; temperature profile
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| 英文摘要: | The effects of seasonal temperature variation on sound speed contrasts at the seafloor are usually considered negligible in the analysis of seismic data but may be significant at large incidence angles (offsets) important for inversion of sediment elastic properties, or long-range acoustic transmission. In coastal areas, the maximum annual seafloor temperature variation can be several degrees Celsius or more, corresponding to a sound speed variation of 30 m/s or more. Thermal pulses propagate via conduction several meters into the seafloor resulting in a damped quasi-sinusoidal temperature profile with predictable wave number characteristics. The oscillating seasonal and spatial character of this signal creates a time- and frequency-dependent effect on the elastic seafloor reflectivity. Results of numerical simulations show that the expected temperature profile for most sediment types and porosities will have the strongest affect on frequencies between about 60 and 600 Hz, at incidence angles greater than about 50°. Key Points Seasonal temperature changes cause significant changes in seismic reflectivityThe effects cannot be identified or removed using the seismic data aloneThe effects can be accurately modeled with sufficient measurements ©2014. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84919588081&doi=10.1002%2f2014GL061383&partnerID=40&md5=40aabc889fe37cb6b335f43424da7768
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/6994
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Naval Research Laboratory, Stennis Space Center, MS, United States
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| Recommended Citation: | |
Wood W.T.,Martin K.M.,Jung W.,et al. Seismic reflectivity effects from seasonal seafloor temperature variation[J]. Geophysical Research Letters,2014-01-01,41(19).
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