Multibeam bathymetry of Astoria Canyon

Multibeam bathymetry shown in the spectrum from red (shallower) to blue (deeper) for depths greater than 200 m across the head of Astoria Canyon. The land and continental shelf are shown in grayscale slope shading where darker colors represent steeper slopes.  The modern Columbia River is far right. In 2019, geophysical surveys using Chirp subbottom and Sparker multichannel seismic surveys were conducted in conjunction with an instrumented tripod deployment. This work is a partnership with University of Washington scientists to understand sediment gravity flows and sources of turbidity currents associated with earthquake shaking. Data sources: USGS/NOAA OCS, Ocean Exploration Trust, NCEI. Map credit: Jenna Hill, USGS