What plate boundaries is Olympic National Park sitting on?

I know that Olympic National park is a subduction boundary, but is it on the Juan de Fuca plate and the north american? If so can someone provide this information for me with a URL I can cite for my project? Thanks a million! :DWhat plate boundaries is Olympic National Park sitting on?
Yes

the Juan de Fuca Plate is subducting beneath the North American Plate

http://en.wikipedia.org/wiki/Cascadia_su鈥?/a>

http://earthquake.usgs.gov/research/stru鈥?/a>