High-Resolution Shear-Wave Logging in Deep-Sea Drill Holes: Implications for Evolution of the Ocean Crust

海底下声波传播的测量为了解海洋沉积物和地壳岩石的物理性质提供了关键数据。这些信息可以用来检查这种材料的组成和变化。从历史上看，大多数研究声学性质的研究要么使用地震技术，要么使用实验室技术。虽然这些数据很有用，但对于推断到海底的重大深度来说，往往是不准确的。随着声波测井在大洋钻探中的出现，一些高分辨率的声波数据已经成为可能。由于岩性、构造、几何和现有设备的复杂性，大多数测量只能确定纵波的变化。本项目将对JOIDES分辨率现有的测量横波速度和波形的工业设备进行改装和改装。这些现场数据可以与常规测量的压缩速度相结合，以完整地表征钻井沉积物的声学特性。首席研究员是一位很有前途的年轻科学家，他完全有资格承担这项拟议的项目。这一奖项代表着他第一次获得国家科学基金会的研究资助。

Measurements of acoustic wave propagation beneath the seafloor provide critical data for understanding the physical properties of marine sediments and crustal rock. Such information can be used to examine the composition and alteration of such material. Historically, most studies investigating the acoustic properties have used either seismic or laboratory techniques. Although useful, such data is often inaccurate for extrapolating to significant depth in the sea-floor. With the advent of sonic logging in the Ocean Drilling Program, some high-resolution acoustic data has become available. Because of the complexity of lithology, structure, geometry and available equipment, most measurements have only been able to determine compressional wave variations. The present project would adapt and modify for use on the JOIDES Resolution available industry equipment for measuring shear wave velocities and waveforms. This in situ data can be combined with routinely measured compressional velocities to completely characterize the acoustic properties of drilled sediments. The principal investigator is a promising young scientist who is fully qualified to undertake the proposed project. This award represents his first NSF research support.