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USGS Arizona

US Department of the Interior
@USGSAZ
USGS science from the southwest US & beyond. Follow us for science news, new publications, and USGS-related activities. Tweets do not = endorsement.
Southwest U.S.
Joined June 2014
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    USGS Arizona
    US Department of the Interior
    @USGSAZ
    Jul 4
    Happy Fourth of July! Did you know that Arizona is home to a unique population of desert-nesting bald eagles? While many people associate these iconic birds with the dense forests of the Pacific Northwest or Alaska, they also thrive along Arizona's desert rivers and reservoirs.
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    USGS Arizona
    US Department of the Interior
    @USGSAZ
    Jun 30
    Happy Asteroid Day!
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    USGS Astrogeology
    US Department of the Interior
    @USGS_AstroGeo
    Jun 30
    Ready to rock your world? Asteroid Day lands June 30! ☄️ Asteroid Day is a day of global awareness of asteroids and planetary defense, held annually on the anniversary of the Tunguska impact event in 1908. USGS Astrogeology plays a critical role in planetary defense and
    Several hikers in the foreground descending into the bowl of Meteor Crater with rock layers exposed on the opposite crater wall
  • user avatar
    USGS Arizona
    US Department of the Interior
    @USGSAZ
    Jun 30
    On the morning of December 23, 1889, photographer Franklin Nims stepped onto a gravel bar at a slight bend in the Colorado River and took this photograph. Nims was the photographer for the Stanton Expedition, a survey led by railroad engineer Robert Brewster Stanton to determine
    Wide river flowing through steep rocky canyon walls with small boats docked along the shore at the base of the cliffs. 1889 Nims (Stanton Expedition)
    Large concrete dam spanning a river between steep rocky cliffs under a cloudy sky. 1992 USGS.
    A large concrete dam spans a river between steep rocky cliffs under a clear blue sky. 2011 Webb (USGS).
  • user avatar
    USGS Arizona
    US Department of the Interior
    @USGSAZ
    Jun 25
    Before there were photo filters, there was just... waiting a century to take the exact same picture. By standing in the exact footsteps of photographers from the early 1900s, researchers can document exactly how landscapes change over time. The Southwest Repeat Photography
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    USGS Arizona
    US Department of the Interior
    @USGSAZ
    Jun 23
    How do you build a solar facility without disturbing soil and creating dusty conditions? 💨☀️ Building solar facilities in the desert requires installing panels and infrastructure, but the way that construction is implemented can affect how much wind erosion occurs. Dust