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: 142
Date published: October 24, 2018
Status: Active

Aquifer-Storage Change and Land-Surface Elevation Change Monitoring in the Tucson Active Management Area

The Arizona Water Science Center is monitoring aquifer-storage changes and land subsidence within the Tucson Active Management Area (AMA). Land-surface elevation change is monitored at a network of benchmarks throughout the Tucson AMA by measuring changes in land surface elevation over time (approximately annually) with Interferometric Synthetic Aperture Radar (InSAR).  Aquifer-storage change...

Date published: October 24, 2018
Status: Active

MER MI Products

A single MI image or an Microscopic Imager mosaic can be merged with Pancam color images. The two products must be coregistered first, and then added together to produce colorized images in which the intensity comes from the MI and color (hue/saturation) comes from the Pancam images. This method of colorizing data may not yield a satisfactory product if the solar illumination...

Date published: October 24, 2018
Status: Active

Evidence of Cryovolcanism on Titan

The Cassini RADAR team led by USGS scientist, Randolph Kirk, has discovered the "best candidate yet" for an ice volcano on Saturn's moon Titan. The 3D view reveals multiple mountain peaks, deep pits and finger-like flows at Sotra Facula. Some of the terrain resembles volcanic cones, craters and flows on Earth but made of Titan materials (ice and/or carbon compounds) not molten...

Date published: October 24, 2018
Status: Active

Cassini Observations of Io's Visible Aurorae

As the Cassini spacecraft passed through the Jovian system on its way to Saturn, it captured more than 500 images of Jupiter's moon Io in eclipse. Cassini's near-ultraviolet filters detected the moon's bright equatorial glows, supporting the interpretation that the visible emissions are predominantly due to molecular sulfer dioxide (SO2).

Date published: October 24, 2018
Status: Active

Laboratory Infrared Spectroscopy of Mars Analog Materials

Former USGS scientist, Jeff Johnson, performed key research on the detection of dust on the Martian surface. This work explored the laboratory thermal infrared and visible/near-infrared spectroscopy of palagonitic dust coatings on rock substrates and experimentally shocked feldspars and pyroxenes.

Date published: October 22, 2018
Status: Active

Three Decades of Martian Surface Changes

The surface of Mars has changed dramatically during the three decades spanned by spacecraft exploration. Comparisons of Mars Global Surveyor images with Viking and Mariner 9 pictures suggest that more than one third of Mars' surface area has brightened or darkened by at least 10%. 

Date published: October 22, 2018
Status: Active

Valles Marineris - The Grand Canyon of Mars

The Valles Marineris is a system of canyons located just south of the Martian equator. The system is about 4000 km long, and, if on earth, would extend all the way across the United States. The central individual troughs, generally 50 to 100 km wide, merge into a depression as much as 600 km wide. In places the canyon floor reaches a depth of 10 km, 6 to 7 times deeper than...

Date published: October 22, 2018
Status: Active

Sub-ice Volcanism on Earth and Mars

Sub-glacially erupted volcanoes form free-standing flat-topped mesas, known as tuyas. Although there are some silicic edifices (e.g. Tuffen et al., 2002), most terrestrial sub-ice volcanoes are mafic and consist of horizontal layered basaltic lavas overlying friable flank deposits of steeply-dipping (angled) hyaloclastite breccias composed of variably-altered fine-grained...

Date published: October 22, 2018
Status: Active

Venus Magellan Impact Crater Database

The NASA Magellan spacecraft provided synthetic aperture radar (SAR) image coverage of 98% of the surface of the planet Venus, in addition to topography and several types of physical property data on the venusian surface (e.g., radar reflectivity, radar backscatter, emissivity, and rms slopes).(See Special Magellan Issue of J. Geophys. Res., v. 97, nos. E8 and E10, August 25...

Date published: October 22, 2018
Status: Active

Mars MER Microscopic Imager Surface Findings

The Microscopic Imagers (MI) on the Mars Exploration Rovers, Spirit and Opportunity, have returned images of Mars with higher resolution than any previous camera system, allowing detailed petrographic and sedimentological studies of the rocks and soils. Designed to simulate a geologist’s hand lens, the MI cameras were mounted on the rovers’ instrument arms. They can resolve...

Date published: October 19, 2018
Status: Archived

Moon Pyroclastic Volcanism Project

The products of explosive or pyroclastic volcanic eruptions on the Moon have intrigued lunar scientists for years. These deposits, nearly 100 in number and spread widely across the lunar surface, are generally dark and smooth-surfaced. Although pyroclastic materials were found in all lunar samples and thus they are known to be widely dispersed from their sources, the dark...

Date published: October 19, 2018
Status: Active

Revisiting Lava Flow Simple Models

Simple models relating the final dimensions of a lava flow to eruption parameters an lava rheology were used extensively in the 1980's but have fallen out of use in the terrestrial vocanology community. However, in the planetary volcanology community these models have had a resurgence of utilization, especially in response to the availability of high resolution topographic...

Filter Total Items: 62
Date published: August 4, 2016

Prospect- and Mine-Related Features from U.S. Geological Survey 7.5- and 15-Minute Topographic Quadrangle Maps of the Western United States

These data are part of a larger USGS project to develop an updated geospatial database of mines, mineral deposits and mineral regions in the United States. Mine and prospect-related symbols, such as those used to represent prospect pits, mines, adits, dumps, tailings, etc., hereafter referred to as “mine” symbols or features, are currently being digitized on a st

Date published: April 20, 2016

Structures Data

USGS data portray selected structures data, including the location and characteristics of manmade facilities. Characteristics consist of a structure's physical form (footprint), function, name, location, and detailed information about the structure. The types of structures collected are largely determined by the needs of the disaster planning and response and homeland security organizations....

Date published: April 19, 2016

The United States Interagency Elevation Inventory (USIEI)

The USIEI is a comprehensive, nationwide listing of known high-accuracy topographic and bathymetric data for the United States and its territories. The project is a collaborative effort of the USGS and NOAA with contributions from other federal agencies. The inventory supports the 3D Elevation Program and the Integrated Ocean and Coastal Mapping effort. This resource is updated in Spring and...

Date published: April 19, 2016

Elevation Data

The 3DEP products and services available through The National Map consist of lidar point clouds (LPC), standard digital elevation models (DEMs) at various horizontal resolutions, elevation source and associated datasets, an elevation point query service and bulk point query service. All 3DEP products are available, free of charge and without use restrictions.

Date published: April 12, 2016

Orthoimagery Data

Orthoimagery data typically are high resolution aerial images that combine the visual attributes of an aerial photograph with the spatial accuracy and reliability of a planimetric map. The National Map offers public domain, 1-meter orthoimagery for the conterminous United States with many urban areas and other locations at 2-foot or finer resolution.

Date published: April 12, 2016

The National Map Small-Scale Collection

The National Map offers a collection of small-scale datasets, most of which are at 1:1,000,000. The National Map publishes two data collections at one million-scale: one for Global Map users and one for National Map users. In terms of vector geometry, the lines, points, and areas in these data collections are identical. The difference is in the attributes assigned to these features.

Date published: March 12, 2016

WaterWatch

WaterWatch is a U.S. Geological Survey (USGS) World Wide Web site that displays maps, graphs, and tables describing real-time, recent, and past streamflow conditions for the United States. The real-time information generally is updated on an hourly basis.

Date published: March 4, 2016

Current Alerts for U.S. Volcanoes

Volcano-alert notifications are produced by Volcano Observatory scientists based on analysis of data from monitoring networks, direct observations, and satellite sensors. They are issued for both increasing and decreasing volcanic activity and include text about the nature of the unrest or eruption and about potential or current hazards and likely outcomes.

Date published: January 1, 2016

Total Mercury Concentrations in Fish Muscle from the Colorado River and Bright Angel Creek, AZ, USA (2015)

This dataset contains data on the length, mass, and muscle total mercury concentration of Brown Trout (Salmo trutta) and Rainbow Trout (Oncorhynchus mykiss) collected from the Colorado River in Glen Canyon National Recreation Area (GLCA) and Grand Canyon National Park (GRCA), and Bright Angel Creek in GRCA.

Date published: November 23, 2013

Land Treatment Digital Library (LTDL)

The Land Treatment Digital Library (LTDL) was created by the USGS to catalog legacy land treatment information on Bureau of Land Management lands in the western United States. The LTDL can be used by federal managers and scientists for compiling information for data-calls, producing maps, generating reports, and conducting analyses at varying spatial and temporal scales.

Filter Total Items: 134
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Year Published: 1999

Ground-water quality in the Sierra Vista subbasin, Arizona, 1996-97

Coes, Alissa L.; Gellenbeck, Dorinda J.; Towne, Douglas Clark
Ground-water quality in the Sierra Vista subbasin, Arizona, 1996-97; 1999; WRI; 99-4056; Coes, Alissa L.; Gellenbeck, Dorinda J.; Towne, Douglas Clark

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Year Published: 1999

Hydrogeologic investigations of the Sierra Vista subwatershed of the Upper San Pedro Basin, Cochise County, southeast Arizona

The hydrogeologic system in the Sierra Vista subwatershed of the Upper San Pedro Basin in southeastern Arizona was investigated for the purpose of developing a better understanding of stream-aquifer interactions. The San Pedro River is an intermittent stream that supports a narrow corridor of riparian vegetation. Withdrawal of ground water will...

Pool, Donald R.; Coes, Alissa L.
Hydrogeologic investigations of the Sierra Vista subwatershed of the Upper San Pedro Basin, Cochise County, southeast Arizona; 1999; WRI; 99-4197; Pool, Donald R.; Coes, Alissa L.

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Year Published: 1999

Ground-water quality in alluvial basins that have minimal urban development, south-central Arizona

Ground-water quality data (1917-96) from 772 wells in 16 alluvial basins that have minimal urban development were used to determine the effect of nonurban factors on ground-water quality in south- central Arizona. Characterization of the spatial variability of ground-water quality within and among alluvial basins that have minimal urban...

Gellenbeck, Dorinda J.; Coes, Alissa L.
Ground-water quality in alluvial basins that have minimal urban development, south-central Arizona; 1999; WRI; 99-4005; Gellenbeck, Dorinda J.; Coes, Alissa L.

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Year Published: 1999

Ground-water, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona, 1997

The Black Mesa monitoring program is designed to document long-term effects of ground-water from the N aquifer by industrial and municipal users. The N aquifer is the major source of water in the 5,400-square-mile Black Mesa area, and the ground water occurs under confined and unconfined conditions. Monitoring activities include continuous and...

Littin, Gregory R.; Baum, Bradley M.; Truini, Margot
Ground-water, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona, 1997; 1999; OFR; 98-653; Littin, Gregory R.; Baum, Bradley M.; Truini, Margot

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Year Published: 1998

Modeling of flood-deposited sand distributions in a reach of the Colorado River below the Little Colorado River, Grand Canyon, Arizona

A release from Glen Canyon Dam during March-April 1996 was designed to test the effectiveness with which the riparian environment could be renewed with discharges greatly in excess of the normal powerplant-restricted maximum. Of primary concern was the rebuilding of sand deposits along the channel sides that are important to the flora and fauna...

Wiele, S.M.
Modeling of flood-deposited sand distributions in a reach of the Colorado River below the Little Colorado River, Grand Canyon, Arizona; 1998; WRI; 97-4168; Wiele, S. M.

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Year Published: 1997

Modeling of sand movement storage in the Colorado River through the Grand Canyon

Wiele, Stephen Mark
Modeling of sand movement storage in the Colorado River through the Grand Canyon; 1997; FS; 227-96; Wiele, Stephen Mark

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Year Published: 1997

Ground-water, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona, 1996

The Black Mesa monitoring program is designed to document long-term effects of ground-water pumping from the N aquifer by industrial and municipal users. The N aquifer is the major source of water in the 5,400-square-mile Black Mesa area, and the ground water occurs under confined and unconfined conditions. Monitoring activities include...

Littin, Gregory R.; Monroe, Stephen A.
Ground-water, surface-water, and water-chemistry data, Black Mesa area, northeastern Arizona, 1996; 1997; OFR; 97-566; Littin, Gregory R.; Monroe, Stephen A.

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Year Published: 1997

Hydrologic data, Colorado River and major tributaries, Glen Canyon Dam to Diamond Creek, Arizona, water years 1990-95

The U.S. Geological Survey collected hydrologic data at 12 continuous-record stations along the Colorado River and its major tributaries between Glen Canyon Dam and Diamond Creek. The data were collected from October 1989 through September 1995 as part of the Bureau of Reclamation's Glen Canyon Environmental Studies. The data include daily values...

Rote, John J.; Flynn, Marilyn E.; Bills, D.J.
Hydrologic data, Colorado River and major tributaries, Glen Canyon Dam to Diamond Creek, Arizona, water years 1990-95; 1997; OFR; 97-250; Rote, John J.; Flynn, Marilyn E.; Bills, D. J.

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Year Published: 1997

Sand-storage changes in the Colorado River downstream from the Paria and Little Colorado rivers, April 1994 to August 1995

Sixty-six cross sections on the Colorado River in 11-kilometer reachesdownstream from the Paria and Little Colorado Rivers were monitoredfrom June 1992 to August 1995 to provide data to evaluate the effectof releases from Glen Canyon Dam on channel-sand storage and fordevelopment of multidimensional flow and sediment-transport models.Most of the...

Graf, Julia B.; Marlow, Jonathan E.; Rigas, Patricia D.; Jansen, Samuel M.D.
Sand-storage changes in the Colorado River downstream from the Paria and Little Colorado rivers, April 1994 to August 1995; 1997; OFR; 97-206; Graf, Julia B.; Marlow, Jonathan E.; Rigas, Patricia D.; Jansen, Samuel M. D.

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Year Published: 1997

Streamflow and sediment data collected to determine the effects of a controlled flood in March and April 1996 on the Colorado River between Lees Ferry and Diamond Creek, Arizona

An 8-day period of planned release of water at 1,275 cubic meters per second from Glen Canyon Dam in March and April 1996 provided an opportunity to collect data on river stage, streamflow, water chemistry, and sediment transport at discharges above powerplant releases. The U.S. Geological Survey collected data at five streamflow-gaging stations...

Konieczki, Alice D.; Graf, Julia B.; Carpenter, Michael C.
Streamflow and sediment data collected to determine the effects of a controlled flood in March and April 1996 on the Colorado River between Lees Ferry and Diamond Creek, Arizona; 1997; OFR; 97-224; Konieczki, Alice D.; Graf, Julia B.; Carpenter, Michael C.

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Year Published: 1997

The Colorado River in Grand Canyon: how fast does it flow?

Opening the jet tubes at Glen Canyon Dam on March 26, 1996, released from Lake Powell a controlled flood of water that traveled down the Colorado River in Grand Canyon. How fast did the water move? How long did it take for water to reach a particular point along the river? The answers to these questions are important because the speed of river...

Graf, Julia B.
The Colorado River in Grand Canyon: how fast does it flow?; 1997; FS; 168-97; Graf, Julia B.

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Year Published: 1997

Geochemical analyses of ground-water ages, recharge rates, and hydraulic conductivity of the N aquifer, Black Mesa area, Arizona

The Navajo Nation and Hopi Tribe of the Black Mesa area, Arizona, depend on ground water from the N aquifer to meet most tribal and industrial needs. Increasing use of this aquifer is creating concerns about possible adverse effects of increased ground-water withdrawals on the water resources of the region. A thorough understanding of the N...

Lopes, Thomas J.; Hoffmann, John P.
Geochemical analyses of ground-water ages, recharge rates, and hydraulic conductivity of the N aquifer, Black Mesa area, Arizona; 1997; WRI; 96-4190; Lopes, Thomas J.; Hoffmann, John P.

Filter Total Items: 260
Image from an application that navigates users through USGS National Oil and Gas Assessment Provinces
November 14, 2018

National Oil and Gas Assessment Provinces

This is a graphic from the USGS National Oil and Gas Assessment Explorer application, which allows user to drill into 70 oil and gas assessment provinces throughout the United States.

Flooding at Vekol Wash, Arizona
October 2, 2018

Flooding at Vekol Wash, Arizona

Flooding at Vekol Wash today, south of Phoenix, following remnant rains from Hurricane Rosa. 

Remote Camera, 30-mile Camp (River MIe 30.7)
September 29, 2018

Remote Camera, 30-mile Camp (River MIe 30.7)

Remote Camera, 30-mile Camp (River MIe 30.7)

September 27, 2018

A USGS guide for finding and interpreting high-water marks (AD)

High-water marks provide valuable data for understanding recent and historical flood events. The proper collection and recording of high-water mark data from perishable and preserved evidence informs flood assessments, research, and water resource management. This video provides guidance for skilled high-water mark identification, including marks left behind in natural and

David Scott(right) and James Irwin(left) in the Lunar Roving Vehicle trainer
September 5, 2018

David Scott and James Irwin in the Lunar Roving Vehicle "Grover"

In preperation for Apollo 15, David Scott and James Irwin trained with a training version of the Lunar Rover known as the "Grover". Apollo 15 was the first mission to bring a rover. This allowed the astronauts to cover a larger distance and explore a larger area. 

A RestoreNet garden with plots covered by white cloth.
August 31, 2018

RestoreNet garden testing seedling establishment.

The RestoreNet gardens test seedlings of priority restoration species across the Southwest. This is a recently installed garden located in the juniper woodlands of the Colorado Plateau. The experiemental network will support land managers by providing insight into various restoration techniques, including testing seedlings vs seeds.

A restoration field trial site on red soils, adjacent to buttes.
August 16, 2018

A RestoreNet Garden on the Colorado Plateau

A completed restoration field trial site just after installation. Half of the site is seeded, and the other half had plants and weed cloth (white fabric) installed. RAMPS will be collecting data on this site for

...
A group of field workers installs an experimental garden.
August 16, 2018

Installing a restoration field trial site

These workers are planting seedlings as part of the restoration field trial network. Each garden in the network is examining seedlings and seeds in conjunction with restoration treatments to better understand how

...
Bare ground with 2x2 meter square plots of various restoration treatments.
August 16, 2018

Seeding treatment experiment

View of a recently installed Restoration Field Trial Network site in the rangelands of Northern Arizona. This part of the site contains the seeding treatments: mulch, ConMods (metal crosses), pits, and two

...
June 30, 2018

Understanding Floods | Long-term Streamflow Data Collection (AD)

The USGS is developing methods to improve data collection during floods to gain new insight into the rise and fall of flood waters. In the past, the only data left behind after a flood was how high the water got, or the peak of the flood. This video presents the methodology that hydrologists are using to set up a Continuous Slope-area Reach in remote areas that are

June 30, 2018

Understanding Floods | Long-term Streamflow Data Collection

The USGS is developing methods to improve data collection during floods to gain new insight into the rise and fall of flood waters. In the past, the only data left behind after a flood was how high the water got, or the peak of the flood. This video presents the methodology that hydrologists are using to set up a Continuous Slope-area Reach in remote areas that are

May 11, 2018

Image of the Week - Rattlesnake Fire, AZ

Landsat and Sentinel sensors capture the Rattlesnake Fire as it burns in Arizona.

At the USGS EROS Center, we study land change, operate the Landsat satellites, and maintain the longest, continuously acquired collection of images of the Earth's land surface.

USGS EROS Center (https://eros.usgs.gov/)

Filter Total Items: 204
Santa Cruz River
March 27, 2017

Desert communities throughout the Southwest are putting water availability at the top of their municipal agendas.

View from Canyonlands Research Center
March 15, 2017

Arid and semiarid ecosystems are expected to experience significant changes in temperature and precipitation patterns, which may affect soil organisms in ways that cause surfaces to become lighter in color and thus reflect more sunlight, according to a new U.S. Geological Survey study.

Lake Mead
March 15, 2017

The Colorado River system provides about 35 million Americans with a portion of their water supply. It irrigates 5½ million acres of land in the West and provides water to tribes, parks, and wildlife. The system serves parts of seven States and Mexico—but reservoir levels have crept lower over the past several years, sparking questions about how much water remains and who will have access.

Photo of Pigeon Canyon just before it merges with Snake Gulch in northern Arizona. 
January 24, 2017

Uranium levels in Pigeon Spring, just north of the Grand Canyon, are likely due to a natural source of uranium and not related to the nearby former Pigeon Mine, according to a recent study by the U.S. Geological Survey.

Photo of a young girl drinking water, which likely originated from groundwater sources. 
January 19, 2017

A regional assessment of untreated groundwater in the Basin and Range basin-fill aquifers, which include parts of Nevada, California, Arizona, Utah and adjacent states, is now available from the U.S. Geological Survey.

Photo of scientists conducting water chemistry tests for the San Pedro River aquifer. 
December 20, 2016

For the first time, information about the San Pedro River Aquifer is now available from both the U.S. and Mexico in a new, collaborative report issued from the International Boundary and Water Commission, the Mexican National Water Commission, the U.S. Geological Survey and the Universities of Arizona and Sonora.

Laura Norman, USGS scientist, presenting
December 17, 2016

There was a full house at Cady Hall on Saturday, Dec. 17 to hear USGS scientist Laura Norman, PhD, talk about our water, the liquid gold of the Patagonia watershed. Her presentation was sponsored by the Friends of Sonoita Creek (FOS).

USGS
November 21, 2016

An article published in the Scientific American describes how conservationists along the poverty-stricken Arizona–Mexico are repairing habitat for more than 900 species of wild pollinators and boosting livelihoods.

Photo from Space Racers
October 26, 2016

Kids can visit the USGS Astrogeology Science Center before Nov. 6 for a chance to win an annual membership or a trip to U.S. Space & Rocket Center's Space Camp.

Satellite images showing the condition of vegetation after the 2014 Minute 319 pulse flow.
October 24, 2016

In 2014, a large pulse of water was released into the mostly dry delta of the Colorado River along the U.S.-Mexico border. U.S. Geological Survey scientists are studying the effects of the pulse on the environment as part of a historic, bi-national collaborative effort. The pulse flow and the need to study its effects were accepted as part of the Minute 319 of the 1944 U.S.-Mexico Water Treaty.

USGS
October 20, 2016

Scientists have discovered possible evidence for water-rich minerals on the surface of the largest metallic asteroid in the solar system, according to a study by the U.S. Geological Survey and NASA. 

Photo showing the Great Basin area
October 11, 2016

Large precipitation events that occur about every 10 years are a critical source of recharge for replenishing groundwater resources, according to a new study by the U.S. Geological Survey and the Bureau of Reclamation.

Filter Total Items: 84