National Centers for Environmental Information (NCEI)

University of Texas-Institute for Geophysics
(Formerly The University of Texas Marine Science Institute)

COMMON DEPTH POINT (CDP) SEISMIC REFLECTION DATA

Western Gulf of Mexico

Data Announcement 84-MGG-13

Approximately 3,600 line-km of 12- and 24-fold multichannel Common Depth Point (CDP) seismic reflection data for purchase for the Western Gulf of Mexico. The data were collected in 1974 and 1975 by the University of Texas Institute of Geophysics in cooperation with the Universidad National Autonoma de Mexico during three cruises of the University of Texas Research Vessel IDA GREEN as part of the International Decade of Ocean Exploration (IDOE) program. The data were gathered to define the geologic structure and history of the area, particularly the origin and distribution of salt and the evolution of the rocks underlying the salt, including the ocean crust.* The project, titled "Multichannel Seismic Investigation of the Sea Floor Mineral Resources of the Western Gulf of Mexico," was sponsored by the National Science Foundation. The University of Texas has provided these data to the National Geophysical Data Center (NGDC) (now the National Centers for Environmental Information (NCEI)) for public dissemination.

Data were sampled and recorded at 4-msec intervals using a Texas Instruments DFS 10,000 seismic system. The seismic source consisted of 2 or 3 Bolt model MAG-4200 airguns having a capacity of 1500 cu. in. per gun at a pressure of 500 psi. The hydrophone array consisted of twenty-four 300-ft groups for a total length of 8,000 ft. The multichannel data were supplemented by continuous 3.5 kHz precision-depth recording with some 12-kHz depth recording. A total of 6 seismic lines (27 sections) were processed.

The seismic data are available as full-scale copies (scale: 2.5 in/sec). Navigation and other data are available on 35-mm microfilm or magnetic tape.
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* "Deep Seismic Reflection Results from the Gulf of Mexico," John W. Ladd, Richard T. Buffler, Joel S. Watkins, J. Lamar Worzel, Geophysics Laboratory, Univ. of Texas, Marine Science Institute, Galveston, Texas, and Arturo Carrana, Ceantro de Ciencias del Narm y Limnologia, Mexico, D.F., Mexico.

DATA AVAILABLE

1. Common-Depth Point Seismic Data:
         12- and 24-fold multichannel seismic data for 27 sections (full scale) available in plastic sepia, paper sepia and blackline.

2. Other Geophysical Data:
         3.5 kHz and 12 kHz profiler records and magnetic profiles on 1 roll of 35-mm microfilm (No. 2098)

3. Merged digital navigation, magnetics and bathymetric data are available in MGD77 format on 1 magnetic, 9-track, 1,600 bpi, ASCII. This is also available on CD-ROM.