Sidescan sonar "image" of base of Astoria Canyon wall showing large fractures in rocks. Shadowed areas are pure white. Image courtesy of Lewis and Clark 2001, NOAA/OER.
Sidescan sonar "image" of base of Astoria Canyon wall showing large fractures in rocks. Shadowed areas are pure white. Image courtesy of Lewis and Clark 2001, NOAA/OER.