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SHIPS Tracklines

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Themes visible in the above map: SHIPS TRACKLINES, LATITUDE/LONGITUDE, COASTLINE and LAND. The SHIPS trackline numbers are contained in the LINE field of the SHIPS TRACKLINES theme.

SHIPS (Seismic Hazard Investigations in Puget Sound) Multichannel Seismic Reflection Tracklines
David C. Mosher, Yanpeng Mi, Roy D. Hyndman, Mike Fisher and SHIPS Scientific Party

SHIPS was a multidisciplinary seismic experiment conduct in the marine waters of Puget Sound, Juan de Fuca Strait and Strait of Georgia. It was conducted by a consortium of universities and institutions, including the United States Geological Survey, the Geological Survey of Canada, the Department of Natural Resources of Washington State, the University of Victoria, the University of British Columbia, Dalhousie University, the University of Washington, Oregon State University and the University of Texas, El Paso (Fisher et al., 1999). Data collected include multi-channel seismic reflection, wide-angle reflection, and refraction, through shore-based and marine receiving stations.

The component of SHIPS data used in this report is the multichannel seismic reflection profiles along the tracklines shown in the accompanying map. These data were collected with a 6700 cu.in., 12-gun source array, and a 96-channel, 2375 m-long hydrophone array. Channel spacing is 25 m. Data were digitally acquired at a 4 ms sample rate for a window length of 16 s. Shot spacing was 50 m. The gun array and the hydrophone streamer were towed at 10 m below sea surface. For the data presented in this report, the near 48 channels were processed to four seconds depth to enhance the shallower part of the section. Processing included: geometrical spreading correction, common depth point (CDP) and super CDP sorting, predictive deconvolution, spectrum balancing, bandpass filtering (0-80 Hz), velocity analysis on the super CDP gather, low-cut tau-p velocity filtering, CDP normal moveout correction, DMO correction, AGC, CDP stack, F-X deconvolution and phaseshift migration. Velocity analyses were conducted on every 84th CDP, or about every kilometre. Processing resulted in 24-fold data with 12.5 m spacing between CDP's.

References

Fisher, M.A., and Expedition Participants, 1999. Seismic Survey Probes Urban Earthquake Hazards in Pacific Northwest. EOS, Transactions, American Geophysical Union v. 80, p. 13-17.

 

Reference citation:
Mosher, D.C., Mi, Y., Hyndman, R.D., Fisher, M., and SHIPS Scientific Party
, 2000. SHIPS (Seismic Hazard Investigations in Puget Sound) Multichannel Seismic Reflection Tracklines, in: Mosher, D.C. and Johnson, S.Y. (Eds.), Rathwell, G.J., Kung, R.B., and Rhea, S.B. (Compilers), Neotectonics of the eastern Juan de Fuca Strait; a digital geological and geophysical atlas. Geological Survey of Canada Open File Report 3931

GSC Tracklines
USGS Tracklines
Industry Tracklines
123°45' 40' 35' 30' 25' 20' 15' 10' 05' 123°00' 55' 50' 45' 40' 35' 30' 25' 20' 15' 122°10'
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48°00'
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48°30'
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