Bathymetry and acoustic-backscatter data for Lake Sammamish, Washington collected during USGS field activity 2021-656-FA

The Pacific Northwest is home to numerous faults that cut through the surrounding crust including the Seattle fault. Over time, frictional stresses accumulate along these faults, building slowly until they exceed the fault's strength, resulting in an earthquake. Evidence of these earthquakes may be found in Pacific Northwest lakes. Past underwater landslides caused by the earthquakes should be well preserved in these relatively undisturbed environments. The lake floor of Lake Sammamish in the Pacific Northwest was mapped to find such evidence of past earthquakes. This data release provides November 2021 2-m resolution bathymetry and acoustic-backscatter data of Lake Sammamish, Washington. Data were collected and processed by the U.S. Geological Survey (USGS), Pacific Coastal and Marine Science Center (PCMSC) with fieldwork activity number 2021-656-FA. Data are provided as a GeoTIFF image.