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.

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Filter Total Items: 237
Tamarisk growing along a river
April 22, 2006

A single species stand of nonnative tamarisk

Single species stand of nonnative tamarisk on the Lower Colorado River at Cibola National Wildlife Refuge, California

February 23, 2006

PubTalk 2/2006 — Science and Natural Resources along La Frontera

By Floyd Gray, Geologist

  • Natural systems-water, geology, and wildlife-tend to cross the 1,900- mile-long arbitrary political border between Mexico and the U.S.
  • Rapid population growth on the U.S. side and in Mexican border cities is creating a variety of environmental, ecological, and human health problems
  • The San Pedro River
Poster composed of photographs and text.
December 31, 2005

Flying Eyeball Measures Grand Canyon Sand

Large-scale poster describing USGS work.

USGS scientists needed a better way to measure river sand in the Grand Canyon. Traditionally, scientists used a bucket to get about 75 sand samples on each trip, which were analyzed weeks later in a lab.

To measure more locations and to speed up the analysis, we developed the Flying Eyeball underwater microscope.

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Hydrologist sampling for sediment and turbidity, Little Colorado River, Grand Canyon
December 31, 2005

Hydrologist sampling for sediment and turbidity, Little Colorado River

Here, a U.S. Geological Survey (USGS) hydrographer is collecting a suspended-sediment water sample from the Little Colorado River, a kilometer upstream from the Little Colorado River, Grand Canyon, Arizona, USA. To gain knowledge of the suspended-sediment characteristics of the entire river (water quality can vary greatly across a river), suspended-sediment water samples

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Attribution: Water Resources
August 22, 2005

Flood Measurement on Santa Cruz River (1993 and 2005)

Two historic flood measurements are made on the Santa Cruz River in Tucson, Arizona for the 1993 and 2005 floods.

Image: Drought and Beetle-Killed Piñon Pines in Arizona
May 4, 2005

Drought and Beetle-Killed Piñon Pines in Arizona

Drought and beetle-killed piñon pines in Walnut Canyon National Monument near Flagstaff, Arizona, amid some surviving trees. Forest drought stress is highly correlated with mortality from poor growth, bark beetle outbreaks, and high-severity fire.

Attribution: Natural Hazards
Image: Drought and Beetle-Killed Piñon Pines in Arizona
May 4, 2005

Drought and Beetle-Killed Piñon Pines in Arizona

Drought and beetle-killed piñon pines in Walnut Canyon National Monument near Flagstaff, Arizona, amid a few surviving trees. Forest drought stress is strongly correlated with tree mortality from poor growth, bark beetle outbreaks, and high-severity fire.

Attribution: Natural Hazards
Image: A Hermit Thrush on the Nest in Arizona
May 1, 2005

A Hermit Thrush on the Nest in Arizona

Hermit thrushes are a songbird species that was strongly affected by plant community changes in mountains because of reduced snowpack and cascading ecological effects, according to a USGS Montana Cooperative Wildlife Research Unit study.

Attribution: Ecosystems
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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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.