This paper presents measurements of sediment sound-speed profiles measured in situ using the acoustic coring system (ACS). The reported measurements were obtained from seven gravity cores collected in the New England Mud Patch. The ACS uses two sets of transducers mounted below the penetrating tip of a sediment corer to make in situ measurements of geoacoustic properties as the corer penetrates the seabed. The in situ sound-speed profiles are interpreted in the context of stratigraphic layering measured by a seismic survey, and the measured sound-speed profiles are consistent with the geophysical description. The in situ sound-speed profiles measured by the ACS were compared to conventional measurements of sound speed on the recovered cores using the multisensor core logger (MSCL). The MSCL data displayed both random and systematic errors that were attributed to disturbance from the coring process and/or the handling of the sediments after collection. Finally, using porosity and grain size distributions measured from discrete samples of the cored sediments, the in situ sound-speed measurements were compared to empirical regressions based on independent data sets.

中文翻译：

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新英格兰泥浆区重力取心作业期间压缩波速度的原位测量

本文介绍了使用声学取芯系统 (ACS) 原位测量的沉积物声速剖面的测量结果。报告的测量结果是从新英格兰泥浆带中收集的七个重力岩芯中获得的。ACS 使用安装在沉积物取芯器穿透尖端下方的两组换能器，以便在取芯器穿透海床时对地声特性进行原位测量。原位声速剖面是在地震勘测测得的地层分层背景下解释的，实测声速剖面与地球物理描述一致。ACS 测量的原位声速剖面与使用多传感器岩心记录仪 (MSCL) 对回收岩心的常规声速测量进行了比较。MSCL 数据显示了随机和系统误差，这些误差归因于取心过程和/或收集后沉积物处理的干扰。最后，使用从取芯沉积物的离散样本测量的孔隙度和粒度分布，将原位声速测量与基于独立数据集的经验回归进行比较。