Collaborative Research: Oceanic Upper Mantle Structure from Very Large Offset Seismic Refraction Measurements

本项目将沿着西大西洋800公里长的样带，利用有源地震折射实验研究海洋地幔岩石圈的地震结构。样带沿着板块运动流线延伸，该流线完全位于一个扩展中心段内，位于8700万年至1.45亿年的岩石圈上。该实验将确定大西洋岩石圈地幔是否分层，在几百公里的长度尺度上各向异性的大小和形式，海洋Pn尾波的特征对小尺度横向非均质性的限制，以及利用气枪源和海底接收器记录地幔相位的最大范围的参数。

This project will investigate the seismic structure of oceanic mantle lithosphere using an active-source seismic refraction experiment along an 800-km-long transect in the Western Atlantic Ocean. The transect extends along a plate kinematic flow line that lies entirely within a single spreading-center segment, on lithosphere ranging from 87 to 145 million years old. The experiment will determine if the lithospheric mantle in the Atlantic is stratified, the magnitude and form of anisotropy over length scales of a few hundred kilometers, the constraints the character of oceanic Pn coda places on the nature of small-scale lateral heterogeneity, and the parameters that maximize the range at which mantle phases can be recorded using airgun source and ocean-bottom receivers.