Processed multichannel seismic data at the Blanco Transform in the Pacific Ocean, acquired during R/V Maurice Ewing expedition EW0410 (2004)

The Blanco Transform Seismic cruise acquired marine seismic reflection and refraction data at the Blanco Transform in the Pacific Ocean. A companion program, EW0305, took place in 2003 where fast-spreading oceanic crust is exposed at Hess Deep. The primary objective of the cruise was to make a direct link between the geologic and seismic structure of intermediate-spreading oceanic crust. Questions that were to be addressed by the seismic experiments include: 1) Is there a correlation between seismic and geologic structure at the Blanco Transform? 2) Is the seismic structure at the Blanco Transform typical of intermediate-spreading crust? 3) What is the evolution of the shallow velocity structure from zero-age rise-axis crust to the 0.65-1.65 Ma crust in the study areas? Funding was provided by NSF grants OCE-0137286.

布兰科转换断层（Blanco Transform）地震科考航次在太平洋布兰科转换断层区域采集了海洋地震反射与折射数据。配套项目EW0305于2003年实施，其研究区域为赫斯深渊（Hess Deep），此处出露快速扩张洋壳。本次航次的核心目标是建立中等扩张速率洋壳的地质结构与地震结构之间的直接关联。本次航次开展的地震实验旨在解答以下科学问题：1）布兰科转换断层处的地震结构与地质结构是否存在相关性？2）布兰科转换断层处的地震结构是否为中等扩张速率洋壳的典型特征？3）研究区内浅层速度结构从零年龄扩张轴地壳到0.65~1.65百万年地壳的演化规律是什么？本研究经费由美国国家科学基金会（NSF）项目OCE-0137286资助。