Updated Deep-Tow Acoustics/Geophysics System Compressional Velocity Database

摘要

This memorandum report describes the Deep-Tow Acoustics/Geophysics System (DTAGS)compressional velocity database, a compilation of compressional velocity-layer thickness functions derived from DTAGS deep-tow multichannel seismic data. Geologic environments represented by the velocity functions included in this database include thick turbidite deposits, thick sediment basin deposits, sediment containing methane hydrate, and thin sediments overlying young basement. Horizontal sampling frequency (distance between velocity profiles) of the database ranges from 45 to 230 m. Vertical sampling frequency (layer thickness) ranges from 5 to 300 m. These compressional velocity-layer thickness profiles were determined from DTAGS multichannel seismic data using standard semblance velocity analysis procedures. The ASCII files containing compressional velocity data are included on an MSDOS 3-1/2 in. diskette, which may be ordered from the authors using the form included with this report. Included on the disk with the data files are two text files containing a description of the data file format and a list of the locations where the data were collected. As DTAGS data continue to be collected and processed, this database will be updated to include all available compressional velocity functions. DTAGS, Database.