Processed Unmigrated Time Stack, Prestack Depth-Migrated, and Depth-to-Time-converted seismic data from the EDGE-302 deep crustal seismic reflection transect of the eastern Aleutian arc-trench

This data set represents processed Multi-Channel Seismic (MCS) profiles acquired in July 1988 with the Digicon recording vessel Geotide. The four versions of data files presented here, in SEG-Y format, are in progressively advanced stages of processing. Processing was carried out at the GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany using PRAKLA-SEISMOS software on a CONVEX computer. The unmigrated time stack (file EDGE_302_stack.sgy) used a standard processing flow of scaling, multiple removal, deconvolution, filtering, Velocity analysis, Normal Moveout, and Stacking. The initial Prestack depth migration (file EDGE_302_tmig2d.sgy) was then performed using depth focusing analysis on migrated common image gather iteratively to build a velocity field in depth. The final prestack depth migration (file EDGE_302_dmig.sgy) had additional weighting of the amplitudes below the top of the oceanic plate and cleaning of remaining multiple energy applied. The final prestack depth migration was converted to time (file EDGE_302_tmig.sgy). The unmigrated time has a CMP interval of 12.5m; all others are 25m. Additional details for each data file are given in the associated data file details document. The project was supported by National Science Foundation Grant EAR87-21194 and Texaco Oil Company.

本数据集呈现了1988年7月由Digicon记录船Geotide采集的经过处理的多元地震（MCS）剖面。此处提供的四个版本的数据文件，以SEG-Y格式呈现，其处理阶段依次递进。处理工作在德国基尔的赫尔姆霍兹海洋研究中心（GEOMAR）进行，使用CONVEX计算机上的PRAKLA-SEISMOS软件完成。未进行偏移的时间叠加（文件EDGE_302_stack.sgy）采用了标准的处理流程，包括比例尺调整、多次消除、反演、滤波、速度分析、正常偏移和叠加。随后，通过深度聚焦分析，对已偏移的共成像进行迭代处理，构建了深度速度场，从而进行了初始的预偏移深度偏移（文件EDGE_302_tmig2d.sgy）。最终的预偏移深度偏移（文件EDGE_302_dmig.sgy）对海洋板块顶部以下的振幅进行了额外加权，并对剩余的多次能量进行了净化。最终的预偏移深度偏移被转换为时间域（文件EDGE_302_tmig.sgy）。未进行偏移的时间叠加的CMP道间距为12.5米；其余均为25米。每个数据文件的详细信息可在相关数据文件详情文档中找到。该项目得到了国家科学基金会资助项目EAR87-21194和壳牌石油公司的支持。