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Source and receiver geometry corrections for deep towed multichannel seismic data
Author(s) -
Walia R.,
Hannay D.
Publication year - 1999
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl900402
Subject(s) - geology , seismic trace , submarine pipeline , seismology , hydrophone , reflection (computer programming) , wavelength , vertical seismic profile , stack (abstract data type) , seabed , geodesy , acoustics , optics , oceanography , physics , artificial intelligence , computer science , wavelet , programming language
High resolution seismic data were collected using a Deep‐Tow Acoustics/Geophysics System (DTAGS) near ODP site 889/890, offshore Vancouver Island for deep sea gas hydrate study. The near bottom configuration and wide high‐frequency bandwidth allow much better resolution of the structures in the upper ∼400 m. However, the short 2ndash;6 m wavelengths imply accurate positioning of the source and receivers to properly determine moveout velocities and to stack the data. Consequently, a method of estimating the depths of the source and hydrophones using sea‐surface reflection times was developed. Travel time corrections based on these sea surface measurements were applied to the data by marching a time window along the seismic trace to account for the angular dependency of the reflected raypath. The need for these corrections is clearly illustrated by the results, which show non‐linear depth variations of up to 50–100 m for both the source and the hydrophone array.