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2017 U.S. Geological Survey/BC Hydro seismic data recorded at three dam sites on Vancouver Island, British Columbia, Canada

September 5, 2018

In May 2017, we acquired high-resolution seismic profiles near three dam sites (Strathcona, Laodre and John Hart dams) located on Vancouver Island, British Columbia, Canada. Our goal was to measure seismic velocities (particularly Vs) at each dam site using body and surface waves. The data were analyzed using refraction tomography and multi-channel analysis of surface waves (MASW), especially in the upper 30 m of the subsurface. The analyzed data are presented in a separate report (Catchings and others, in review). We also recorded one hour of ambient noise (passive-source) data along most of the same profiles. This work was completed under the authority of a 2011 agreement relating to scientific and technical cooperation in the earth sciences between the USGS-Department of the Interior of the United States and British Columbia Hydro and Power Authority of British Columbia, Canada. Acknowledgements We thank Keith Galvin, Freddie Jackson, Nicholas Ogasa, Brandon Smythe, Steve Watson, Alan Yong, and Edward Zhang for field assistance in acquiring the data. We thank Maria Garcia and Ray Chickite for medical assistance, and we thank several additional BC Hydro staff for field and office support. We thank Robert Fornasier and Jane Meyer for logistical and administrative support. Reference Cited Catchings, R.D., Addo, K.O., Goldman, M.R., Chan, J.H., Sickler, R.R., and Criley, C.J., in review, Seismic velocities and 2-D structural variations at three BC Hydro dam sites, Vancouver Island, British Columbia, Canada: U.S. Geological Survey Open-File Report 201X-XXXX, XX pp.