Multichannel and high resolution seismic reflection survey of the marine Fraser River delta, Vancouver, British Columbia: Tully PGC95001

Abstract

The internal structure of the Fraser River delta holds the key to understanding its development and stability. Survey PGC95001 mapped the southern part of the Strait of Georgia using multichannel and high resolution seismic reflection techniques. The purpose was to define better the structure of the delta, including failure features known as the Foreslope Hills and the southern Roberts Bank Failure Complex. A rectangular grid of lines spaced 500 m apart was run over each of the latter features to achieve this objective. The multichannel data are of excellent quality and provide new information about the detailed structure and properties of the delta sediments. Brute stacks of these data have increased signal to noise ratios significantly and show good definition of structure at depth. The Huntec sparker system has proven effective on the delta for high resolution profiling. Digital collection of these data permit use of hi-fidelity, numerical post-processing techniques to enhance interpretation.