Unified Interior Regions

Arizona

The Southwest Region includes California, Nevada, and Arizona. The Regional Office, headquartered in Sacramento, provides Center oversight and support, facilitates internal and external collaborations, and works to further USGS strategic science directions.

States L2 Landing Page Tabs

Filter Total Items: 229
Photo of sphere-like grains found on Mars
December 31, 2004

Sphere-like grains found on Mars, nicknamed "Blueberries"

Photo taken by Opportunity of Sphere-like grains nicknamed "Blueberries", due to their shape. Photo is a mosaic of PANCAM and MI instruments.

Image of Ring around Uranus
July 11, 2004

Uranus's Ring

Infrared composite image of Uranus taken by the Keck Telescope. 

View of Colorado River confluence with the Little Colorado River
February 2, 2004

View of Colorado River confluence with the Little Colorado River

View of Colorado River confluence with the Little Colorado River taken from the rim of Marble Canyon

Map of Mars made with Mars Orbiter Laser Altimeter
March 31, 2003

MGS MOLA Global Colorized Hillshade

This map is based on data from the Mars Orbiter Laser Altimeter (MOLA; Smith and others, 2001), an instrument on NASA’s Mars Global Surveyor (MGS) spacecraft (Albee and others, 2001). The image used for the base of this map represents more than 600 million measurements gathered between 1999 and 2001, adjusted for consistency (Neumann and others, 2001, 2003) and converted

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map of western U.S.showing sagebrush-dominated ecoregions
March 15, 2003

Sagebrush-dominated ecoregions

Sagebrush-dominated ecoregions in the western United States (sagebrush cover types shown in various shades of yellow, pink, and blue-grey).

Image: San Carlos River near Peridot, Southern Arizona - 2000
October 6, 2000

San Carlos River near Peridot, Southern Arizona - 2000

The gaging station has been removed, but the approximate position of the original camera can be established from the background mountains. The channel has shifted back to the left, eliminating the cottonwood trees present in 1964, but black willow is obvious in the foreground, cottonwood seedlings and mature trees appear throughout the view, and non-native tamarisk is

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Attribution: Land Resources
Image: A Red-Faced Warbler in Arizona
May 1, 1998

A Red-Faced Warbler in Arizona

Red-faced warblers are one of the species affected by climate change in the form of reduced snowpack in the Arizona Mountains, according to a USGS Montana Cooperative Wildlife Research Unit study.

Attribution: Ecosystems
Image: Boundary Monument 75E, Southeastern Arizona - 1994
August 21, 1994

Boundary Monument 75E, Southeastern Arizona - 1994

During the past century, the grassland has continued to become more shrubby with increases in such plants as broom snakeweed and velvet mesquite. The mesquite, occurring here near the upper limits of its range, has remained short, probably as the result of catastrophic freezes that have visited the area. Bush muhly is found beneath some of the mesquites. (Raymond M  Turner

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Attribution: Land Resources
Colorized topography (GEDR) over the C3-MIDR mosaic.
June 23, 1993

Magellan Global C3-MDIR Colorized Topographic Mosaic

The original Magellan Compressed Mosaicked Image Data Record (C3-MIDR) archive contains three times compressed mosaics of image swaths (C-BIDRs) at a resolution of 2025 m/pixel. C3-MIDRs consist of mosaics generated by computing 3x3 pixel arithmetic moving averages from the C2-MIDRs. C3-MIDRs, with their 2.025 km pixel widths, are designed to cover the planet at reasonably

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February 19, 1993

Verde-Tangle Severe Flood 1993

This video documents two USGS employees taking a flood measurement during the most severe flood Arizona has seen in 100 years.

February 19, 1993

Flash Floods: USGS Against the Water

A glimpse at the often dangerous task USGS employees make every year to obtain stream flow measurements from flood events.

Image: Santa Catalina Highway, near Tucson, Southern Arizona - 1987
December 27, 1987

Santa Catalina Highway, near Tucson, Southern Arizona - 1987

This image was taken above the Santa Catalina Highway near mile 2.8 a few months after a fire burned across a south-facing slope. The saguaros are showing the effects of being scorched but are still standing. (Raymond M. Turner).

Attribution: Land Resources
Filter Total Items: 191
USGS science for a changing world logo
July 24, 2002

Last week, USGS scientists began sampling sediment and organic-rich streamflow coming from the Rodeo/Chediski fire burn area to discern possible ecological and water-quality effects of this discharge. In addition, three new USGS streamflow gages are allowing advance warning of possible flooding to affected Arizona communities.

USGS
July 24, 2002

Last week, USGS scientists began sampling sediment and organic-rich streamflow coming from the Rodeo/Chediski fire burn area to discern possible ecological and water-quality effects of this discharge. In addition, three new USGS streamflow gages are allowing advance warning of possible flooding to affected Arizona communities.

USGS
April 24, 2002

Picture a sunset in which a "forest" of that Sonoran Desert icon the saguaro cactus is silhouetted against the skyline. Now picture that sunset minus the saguaros and you will have an idea why researchers and resource managers across southern Arizona fear the take-over of the desert by invasive nonnative grasses.

USGS
October 23, 2001

The natural richness of the Colorado Plateau of the southwestern United States is the focus of the Sixth Biennial Conference of Research on the Colorado Plateau, November 6-8, at the du Bois Conference Center on the campus of Northern Arizona University in Flagstaff, Ariz.

USGS
September 24, 2001

Geochemical analyses using strontium isotopes show that many of the timbers used to build the prehistoric great houses of Chaco Canyon, N.M., between A.D. 900 and 1150, were hand-carried to the building site from isolated mountaintops 50 to 60 miles away, according to four Arizona scientists.

USGS science for a changing world logo
April 23, 2001

The effect of low flows of the Colorado River, last summer, on fish, sand distribution, power production, recreation and other aspects of the river environment will be the focus of a Grand Canyon Science Symposium, April 26 and 27, at the Little America Hotel Conference Center in Flagstaff, Ariz.

USGS
April 23, 2001

The effect of low flows of the Colorado River, last summer, on fish, sand distribution, power production, recreation and other aspects of the river environment will be the focus of a Grand Canyon Science Symposium, April 26 and 27, at the Little America Hotel Conference Center in Flagstaff, Ariz.

USGS science for a changing world logo
April 18, 2001

Following the great 1906 San Francisco earthquake, a large number of distant aftershocks or triggered earthquakes occurred much farther away from the fault than previously realized, according to scientists at the U.S. Geological Survey.

USGS
April 18, 2001

Following the great 1906 San Francisco earthquake, a large number of distant aftershocks or triggered earthquakes occurred much farther away from the fault than previously realized, according to scientists at the U.S. Geological Survey.

USGS science for a changing world logo
March 14, 2001

The health and environment of desert tortoises will be the focus of the 26th Annual Meeting and Symposium of the Desert Tortoise Council, in Tucson, Ariz., March 16 through 19.

USGS
March 14, 2001

The health and environment of desert tortoises will be the focus of the 26th Annual Meeting and Symposium of the Desert Tortoise Council, in Tucson, Ariz., March 16 through 19.

USGS science for a changing world logo
February 23, 2001

A new U.S. Geological Survey (USGS) assessment of the nation’s coal resources shows abundant high quality, low-sulfur coal on federal and private lands in the Colorado Plateau region of Arizona, Colorado, New Mexico and Utah. The area is also home to vast quantities of coal bed methane gas - natural gas contained in coal.