Unified Interior Regions

A winding strip of rainbow colors shows the bathymetry (depth) of the bed of the Mokelumne River just above its confluence with the San Joaquin in the Sacramento-San Joaquin River Delta east of San Francisco Bay. USGS scientists mapped the channel as part of a project to

The stories in the Jan. - Feb. 2012 issue of Sound Waves:

https://archive.usgs.gov/archive/sites/soundwaves.usgs.gov/2012/02/

Arctic Expedition Reaches 88.5 Degrees North Latitude—Fourth Joint U.S.-Canada Survey for Purpose of Delineating Extended

A PDF copy of a coloring sheet showing a gopher snake attempting to eat a duck egg in a nest, based on an image taken in Suisun Marsh, California.

A landscape at Whiskeytown National Recreation Area 2 months and 9 months after summer 2018's Carr Fire near Redding, California, where USGS WERC researchers are studying fire impacts, post-fire vegetation recovery, and post-fire erosion and debris flows.

Infographic about the 2019 report "California's Exposure to Volcanic Hazards"

USGS and NPS personnel placed a GPS-transmitter on a California Condor at Pinnacles National Monument.  Photo was taken when the bird was released after attaching the transmitter.

Poster about the 1997-1998 study by USGS Pacific Coastal and Marine Science Center, to map the floor of San Francisco Bay in order to reveal the bay's shipping hazards.

Relative size of eruptions from Yellowstone, WY; Long Valley, CA; Novarupta, AK; Mount St. Helens, WA, and other large volcanic events.

Time-exposure image from video camera along Sunset State Beach in Watsonville, CA, looking northwest. This timex (time-exposure) image is a time average of all frames in a 10-minute video sequence. Learn more about the cameras and how we're using them to study