Sonobuoy refraction data near Kodiak, Alaska
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Abstract
A total of 88 unreversed sonobuoy refraction lines were shot over the continental shelf and slope near Kodiak, Alaska, in 1976 and 1977. Useful results were obtained from 59 of these attempts. The field measurements were carried out aboard the USGS research vessel SAMUEL P. LEE. The refraction lines were concentrated in three major areas: (1) the outer continental shelf from Portlock Bank to Chirikof Island; (2) Shelikof Strait; and (3) the continental slope between Kodiak Seamount and Portlock Bank.
Sound sources used during the refraction survey included 1326 and 2501 cubic inch air gun arrays, and a 160 kilojoule arcer. Most of the sonobuoys employed were U. S. Navy SSQ-41A and SSQ-41B models; a few commercial buoys (Refraction Technology and Fairfield Industries) were also used. Line lengths ranged from 5 to 30 km, and maximum subbottom penegration was 5.1 km.
The field data were recorded on magnetic tape as well as a conventional facsimile recorder. Data reduction was accomplished using the slope-intercept method with the assumption of plane layers. A computer program was used to calculate interval velocities, thicknesses, reflection times, and critical distances for each of the refracting layers; the program also generated a travel time plot showing refracted arrivals as well as wide angle reflections associated with each of the interfaces.
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Sonobuoy refraction data near Kodiak, Alaska |
| Series title | Open-File Report |
| Series number | 78-368 |
| DOI | 10.3133/ofr78368 |
| Year Published | 1978 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | i, 9 p. |
| Country | United States |
| State | Alaska |
| City | Kodiak |
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