Processed multichannel seismic data off Alaska, acquired during R/V Marcus G. Langseth expedition MGL0814 (2008)

The 2008 STEEP (ST. Elias Erosion/tectonics Project) Langseth cruise was part of a multi-disciplinary study to address the evolution of the highest coastal mountain range on Earth - the St. Elias Mountains of southern Alaska and northwestern Canada. The primary objectives for the marine seismic portion of STEEP include are threefold: 1) to image the offshore primary faults within and on the boundaries of the Yakutat Block, 2) to measure the velocity and thickness of the Yakutat crust, and 3) to image the sedimentary cover on the Yakutat Shelf and the sediments that make up the proximal part of the Surveyor Fan.

2008年的STEEP（圣伊利亚斯侵蚀/构造项目）Langseth航行是针对地球上最高海岸山脉——阿拉斯加南部和加拿大西北部的圣伊利亚斯山脉演化进行的多学科研究项目的一部分。STEEP海洋地震部分的主要目标包括三个方面：1）对雅库塔地块及其边界内的海上主要断层进行成像，2）测量雅库塔地壳的速度和厚度，以及3）对雅库塔陆架上的沉积物覆盖层和构成勘探者扇近侧部分的沉积物进行成像。