Processed multichannel seismic data across the southern Antarctic Peninsula, acquired during the R/V Maurice Ewing survey EW9101 (1991)

This was a joint UT and Lamont-Doherty Earth Observatory program collecting a series of MCS lines in the Bransfield Strait, across the South Shetland Trench and farther south along the Antarctic margin. UTIG was responsible for the Bransfield Strait and South Shetland Trench data. Additional lines collected farther south along the margin were the responsibility of Lamont-Doherty Earth Observatory. The goals were to increase understanding of the following processes: Andean-type orogenesis, continental lithosphere extension in a convergent continental margin setting, ridge crest subduction, and interaction of large- offset fracture zones with convergent margins, including the uplift of subduction complexes. Funded by NSF grants OCE89-17332 and OCE89-16436.

本项目为德克萨斯大学（University of Texas, UT）与拉蒙特-多尔蒂地球观测站（Lamont-Doherty Earth Observatory）联合实施的科考计划，旨在布兰斯菲尔德海峡（Bransfield Strait）、横穿南设得兰海沟（South Shetland Trench）并沿南极大陆边缘向南延伸区域采集多道地震（Multi-channel Seismic, MCS）测线数据。德克萨斯大学地球物理研究所（University of Texas Institute for Geophysics, UTIG）负责布兰斯菲尔德海峡与南设得兰海沟的相关数据采集工作；沿南极大陆边缘向南更远区域的测线采集任务，则由拉蒙特-多尔蒂地球观测站承担。本项目的科学目标为深化对以下地质过程的理解：安第斯型造山作用（Andean-type orogenesis）、汇聚型大陆边缘背景下的大陆岩石圈伸展作用、脊峰俯冲作用，以及大偏移距断裂带与汇聚边缘的相互作用（涵盖俯冲杂岩的隆升过程）。本项目由美国国家科学基金会（National Science Foundation, NSF）的OCE89-17332与OCE89-16436两项基金资助。