Acoustic environment of the Hatteras and Nares Abyssal Plains, western North Atlantic Ocean, determined from velocities and physical properties of sediment cores

Tucholke, Brian E.

doi:10.1575/1912/10262

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…When no direct measurements from drill holes are available, the best approach may be to assume that the variation of densities with depth has the general form expected for compacting sediments. Then a relation like (4) can be used, perhaps constrained by near-surface density measurements from short cores [Tucholke, 1980]. At least over the older parts of the Atlantic there are considerable accumulations of sediment.…”

Section: Of Sediment Thicknessmentioning

confidence: 99%

A note on the correction of ocean floor depths for sediment loading

Douaran¹,

Parsons²

1982

J. Geophys. Res.

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The measured physical properties of sediments recovered in a number of deep‐sea drill holes in the North Atlantic have been used to derive expressions for the correction to basement depths required to account for loading by sediments. The average density and porosity over a given thickness of sediment show an approximate linear dependence on sediment thickness. This behavior can be explained as primarily the result of compaction. If the compaction of the sediments is neglected in correcting basement depths for sediment loading, errors of a few hundred meters in the corrected depths can be made. A sediment loading correction based on the observed variation of density with depth can give corrected depths to better than 100 m, with remaining uncertainties due to variability in sediment properties and rebound effects on the measured densities. A relation between sediment thickness and vertical travel time was obtained from sonic velocity measurements on samples from drill holes, sonobuoy wide‐angle reflection experiments, and direct correlation of seismic reflectors with downhole lithology. The sediment loading correction can then be expressed directly in terms of the vertical travel time measured along seismic reflection profiles. The loading correction obtained here for the North Atlantic may not be applicable in areas with different sedimentary environments. When direct measurements of physical properties in drill holes are not available in such areas, it is shown that it is preferable to assume a compaction curve for the appropriate lithology rather than to use observed seismic velocities together with a velocity‐density relationship.

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Section: Of Sediment Thicknessmentioning

confidence: 99%

A note on the correction of ocean floor depths for sediment loading

Douaran¹,

Parsons²

1982

J. Geophys. Res.

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“…Since the various efforts on developing a geoacoustic model of the western North Atlantic and North Pacific Ocean (Hamilton 1970;Tucholke 1980), a lot of research have been conducted to establish the relationship between physical and acoustic properties and the corresponding textural parameters of marine sediments (Hamilton and Bachman 1982;Orsi and Dunn 1991;Weber et al 1997;Kim et al 2001). Though a group of researchers have been actively studying free gas in marine sediments in the world (Garcia-Gil and Garcia-Gil 2002;Judd and Hovland 2007), the presence of gas within sediments that can significantly alter sediment physical and acoustic characteristics including electrical resistivity is relatively less understood.…”

Section: Introductionmentioning

confidence: 99%

Physical and Acoustic Properties of Gas-bearing Sediments in Jinhae Bay, the South Sea of Korea

Lee

Kim

Lee

et al. 2009

Marine Georesources & Geotechnology

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High-resolution seismic survey and sediment core sampling were conducted to investigate acoustic characteristics of gas-bearing sediments in Jinhae Bay, the southeast of Korea. The sediment in Jinhae Bay is mostly homogenous mud deposited after the Holocene transgression. Along with the 410 km of chirp seismic profiling, five piston core samples were collected on the track lines.Gassy sediments are common and occur widely in the bay. Core samples were analyzed for sediment texture, physical properties (porosity, water content, bulk density, and grain density), acoustic properties (compressional wave velocity and attenuation), and electrical resistivity. X-radiograph image analysis was also performed to observe the shape of degassing cracks. There is no significant downcore variation on physical and sediment textures regardless of existence of gas bubbles. However, compressional wave velocity dramatically decreases from average 1480 to 1380$739 m=s for the cores that penetrate the gas-bearing zones. This is probably due to degassying cracks that developed by escaping gases and free gas bubbles that are still trapped in the cores. Electrical resistivity is the only geotechnical property that increases in the gas-bearing zone where compressional wave velocity abruptly decreases. This indicates the possibility of using both electrical resistivity as an index variable as well as to compressional wave velocity to identify gassy sediment microstructure because there are little changes in texture and composition of sediment.

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“…The bottom has a density of 1.38 g / cm and an attenuation of 0.3 dB/ corresponding to the deep silty sediment layers of the Bay of Bengal 68,69 and the North Atlantic Abyssal plain 70,71. The water has a density of 1 g / cm and an attenuation of 6 ϫ 10 −5 dB/ .FIG.…”

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confidence: 99%

Ocean acoustic hurricane classification

Wilson

Makris²

2006

The Journal of the Acoustical Society of America

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Theoretical and empirical evidence are combined to show that underwater acoustic sensing techniques may be valuable for measuring the wind speed and determining the destructive power of a hurricane. This is done by first developing a model for the acoustic intensity and mutual intensity in an ocean waveguide due to a hurricane and then determining the relationship between local wind speed and underwater acoustic intensity. From this it is shown that it should be feasible to accurately measure the local wind speed and classify the destructive power of a hurricane if its eye wall passes directly over a single underwater acoustic sensor. The potential advantages and disadvantages of the proposed acoustic method are weighed against those of currently employed techniques.

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Acoustic environment of the Hatteras and Nares Abyssal Plains, western North Atlantic Ocean, determined from velocities and physical properties of sediment cores

Cited by 3 publications

References 6 publications

A note on the correction of ocean floor depths for sediment loading

A note on the correction of ocean floor depths for sediment loading

Physical and Acoustic Properties of Gas-bearing Sediments in Jinhae Bay, the South Sea of Korea

Ocean acoustic hurricane classification

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