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Epicenter locations of Arizona earthquakes from January through July of 2013.

The Arizona Broadband Seismic Network documented over 50 earthquakes in Arizona from January to July 2013.

GPS Mapping

Geologic map production begins in the field. Geologists spend several months traversing pre-defined areas of Arizona’s landscape to collect geologic information about that area.

A rig on one of the CO2 wells during a testing program in 2003.

Eleven drilling permits were issued and nine wells were drilled through June 30, 2013.

 Northern Arizona Seismic Belt

On July 7that 1:38 MST, a magnitude (*Mw) 3.5 earthquake shook the towns of Fredonia, Jacobs Lake, and Havasu (Figure 1). The earthquake was followed by a series of aftershocks, with two registering Md ~ 2.0 and several in the 1.0 range.

On this, the 125th Anniversary of the Arizona Geological Survey (AZGS), we are celebrating the work of hundreds of geoscientists who struggled to understand and reconstruct Arizona’s geologic past.

Article Author(s): 

Arizona's Historic Earthquakes  -  The southwestern part of this state is not far from the San Andreas fault system, and indeed some related fault structures must now underlie this region. Yuma has felt tremors on several occasions from disturbances…

Fifteen miles south of Florence, Arizona, preparations for a unique drill hole were completed in late February. The drill hole is unprecedented in its physical dimensions. It will likely smash the Arizona depth record of 12,500 feet set in 1972 by Exxon, 15 miles southeast of Tucson.

From alabaster to zinc, this is the earliest volume of Arizona minerals and rocks published by the Arizona State Bureau of Mines. Rough locations are provided for each entry. The first formal publication of an Arizona Geological Survey predecessor agency began in 1915 while Charles Willis was director. 

Geothermal Resources

Identification of truly thermal springs is an indispensable aid in the assessment of a region's geothermal characteristics. Over the years numerous lists of thermal springs in Arizona… 

It was 1943 and World War II raged on and Allied Forces were on the offensive in the Pacific and European theaters. Back home mineral exploration for critical minerals was essential to the war effort. As part of this effort, geologists of the Arizona Bureau of Mines meticulously mapped the geology of the copper-rich Superior mining area of Arizona. 

Geologic hazards -- home buying/building

In a jargon-free article written for the general public, former Arizona Geological Survey Director Larry Fellows summarizes the nature and societal scope of geologic hazards in Arizona. 

Santa Cruz River

This marvelous article includes 17 black and white original photographs by Peter Kresan that capture the destructive nature of the October 1983 floods along Rillito Creek, Pantano Wash and the Santa Cruz River of Tucson and environs.

Post-Tectonic Landscape Evolution in Southeastern Arizona

Southeastern Arizona’s Basin and Range is composed of high relief, rugged mountain ranges – e.g., the Santa Catalinas, Rincons, Galiuros, Pinaleños, Santa Ritas, Chiracahuas – that are separated by intervening tributaries of the Gila River.

A recent paper in the journal Science reported on evidence they obtained documenting an ancient Grand Canyon of about 70 Ma (million years). The date is more than ten times the age that most of those in the photograph ascribe to the canyon.

Crews working on the 3 Navajo well in 1990.

Fifty three drilling permits were issued, 36 wells were drilled, and two wells were plugged as of December 1, 2012.

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