Processed multichannel seismic data across the Caribbean-northeastern South America arc-continent collision zone, acquired during the R/V Maurice Ewing survey EW0404 (2004)

Three teams were involved in the active-source seismic field program: 1) A science party aboard the R/V <i>Maurice Ewing</i> (co-chief scientists P. Mann and D. Sawyer) acquired approximately 6000 km of seismic reflection data. 2) A science party aboard the R/V <i>Seward Johnson II</i> (chief scientist G. Christeson, cruise report) deployed and recovered ocean bottom seismometers (OBSs) along 5 transects; the <i>Ewing</i> provided the seismic source for these instruments. 3) A science party in Venezuela and the ABC islands deployed and recovered seismographs along 4 transects and the island arc; the <i>Ewing</i> and 8 land shots provided the seismic source for these instruments. The purpose was to carry out a geologic-geophysical investigation to test hypotheses related to arc-continent collision and accretion, HP/LT rock exhumation and development of folded belts. Funded by NSF grant OCE0003588.

本主动源地震野外作业共有三支团队参与：
1) 搭乘“莫里斯·尤因”号（R/V Maurice Ewing）考察船的科考团队（联合首席科学家为P. Mann与D. Sawyer）采集了约6000公里的地震反射数据。
2) 搭乘“瑟沃德·约翰逊二世”号（R/V Seward Johnson II）考察船的科考团队（首席科学家为G. Christeson，附航次报告）沿5条测线布设并回收了海底地震仪（OBS），本次作业的震源由“尤因”号提供。
3) 位于委内瑞拉及ABC群岛的科考团队沿4条测线及岛弧布设并回收了地震仪，本次作业的震源由“尤因”号及8个陆上震源提供。
本项目旨在开展地质-地球物理调查，以验证与弧-陆碰撞及增生、高压低温（HP/LT）岩石剥露以及褶皱带发育相关的科学假说。本研究由美国国家科学基金会（NSF）资助项目OCE0003588资助。