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: 226
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
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
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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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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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).

Filter Total Items: 188
USGS
November 17, 2004

WASHINGTON — The Department of the Interior has proposed conducting a scientific study on the use of high flows from Glen Canyon Dam to improve Colorado River natural and cultural resources in Grand Canyon National Park.

USGS
May 27, 2004

A group of federal and university scientists today announced the launch of the Western Mountain Initiative, a 5-year effort funded by the U.S. Geological Survey (USGS) to better understand ongoing changes in the mountains of the western United States.

USGS science for a changing world logo
April 26, 2004

Farmlands, wetlands, forests and deserts that composed the American landscape in the early 20th century have frequently been transformed during the past 30 years into mushrooming metropolitan areas as urbanization spreads across the country.

USGS
April 26, 2004

Farmlands, wetlands, forests and deserts that composed the American landscape in the early 20th century have frequently been transformed during the past 30 years into mushrooming metropolitan areas as urbanization spreads across the country.

USGS science for a changing world logo
August 8, 2003

Wesley Ward has been named Regional Executive for Geology for the Western Region of the U.S. Geological Survey (USGS). The announcement of Ward’s new appointment was made by John D. Buffington, Western Regional Director, effective Aug. 11, 2003.

USGS science for a changing world logo
March 4, 2003

It’s 6 in the evening on February 12 at a sandy campsite on the banks of the Colorado River in northeastern Arizona. A crew of 18 is assembled 50 river miles downstream of Lees Ferry in the Grand Canyon of the Colorado River. The sun has disappeared long ago from the steep canyon walls, and nighttime temperatures hang at a cool 40 degrees Fahrenheit.

USGS
March 4, 2003

It’s 6 in the evening on February 12 at a sandy campsite on the banks of the Colorado River in northeastern Arizona. A crew of 18 is assembled 50 river miles downstream of Lees Ferry in the Grand Canyon of the Colorado River.

USGS
February 14, 2003

Not long ago, conventional wisdom was that you couldn’t predict the climate for more than a few days in advance. Then came the awareness of El Niño and La Niña and the forecast window increased to as much as 6 to 9 months, depending on the region and season.

USGS science for a changing world logo
December 15, 2002

Surface water in the form of ice exposed near the edge of Mars’s southern perennial polar cap has been discovered for the first time, according to U.S. Geological Survey (USGS) research released today in the journal Science. There is evidence that the surface water ice in this region may be widespread - from a half-mile to six miles around the entire southern polar ice cap.

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.