SEABED SOUND SPEED DATA ANALYSIS

Authors
  1. Dodds, J.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);GeoAcoustics Inc, Aurora ONT (CAN)
Abstract
In an ongoing effort, sea floor sediment sound speeds on the Scotian Shelf are estimated from about 58 line-km (9 hours) of data collected with a multi-channel seismic profiler having a deep towed boomer source. The system bandwidth is 3 kHz. Two and three-layer traveltime inversion algorithms are used, with layer thickness in the range of 4-37m. Within each segment of the survey track, the variability of sound speed estimate is 1.2%-6%. Smoothed sound speed estimates by geological classification are: LaHave Clay 1460-1490 m/s; Emerald Silt 1470-1530 m/s; Sambro Sand 1590-1640 m/s; Sable Island Sand and Gravel (sand facies) 1550-1640 m/s; Sable Island Sand and Gravel (gravel facies) 1670-1780 m/s; and Scotian Shelf Drift 1500-1600 m/s. In a section of gassy Emerald Silt, sound speed estimate is 1430-1520 m/s, while in an immediately adjacent gas-free section, 1550 m/s is estimated. The gas concentration is estimated at 0.02% by volume. TRUNCATED
Report Number
DREA-CR-90-404 — Contractor Report (Final)
Date of publication
15 Jan 1990
Number of Pages
79
DSTKIM No
90-03531
CANDIS No
65780
Format(s):
Hardcopy;Originator's fiche received by DSIS

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