A comparison of bistatic scattering from two geologically distinct abyssal hills

被引：10
作者：
Chia, Chin Swee
Makris, Nicholas C.
Fialkowski, Laurie T.
机构：
[1] Massachusetts Institute of Technology, Cambridge
[2] Naval Research Laboratory, Washington
来源：
Journal of the Acoustical Society of America | 2000年 / 108卷 / 5 I期
关键词：
D O I：
10.1121/1.1308047
中图分类号：
学科分类号：
摘要：
The bistatic scattering characteristics of two geologically distinct abyssal hills located on the western flank of the Mid-Atlantic Ridge, known as B' and C', are experimentally compared using data acquired with low-frequency towed-array systems at 1/2 convergence zone (~33 km) stand-off. The comparison is significant because the abyssal hills span the two classes of elevated seafloor crust that cover the Mid-Atlantic Ridge. The highly lineated B' feature is representative of abyssal hills composed of outside corner crust, the most commonly occurring category, whereas the domed C' promontory is representative of the rougher, low-aspect-ratio abyssal hills composed of inside corner crust. The latter are less common and usually restricted to segment valley margins. The mean biazimuthal scattering distributions of the two abyssal hills each exhibit Lambertian behavior with comparable albedos, suggesting that the distinction between abyssal hills composed of differing crust is not significant in modeling long-range reverberation. The adverse effect of using bathymetry that undersamples seafloor projected area in scattering strength analysis is also quantified with data from the B' ridge. Specifically, the use of undersampled bathymetry can lead to significant overestimates in the strength of seafloor scattering. (C) 2000 Acoustical Society of America.
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页码：2053 / 2070
页数：17
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