Arizona Geology

Zeolites are minerals comprised of silicon, aluminum, and oxygen that form frameworks full of cavities and channels that can work as ...

Dr. Jon Spencer, Chief Geologist at AZGS, and head of the geological mapping program, retired on Friday after 33 years with the Survey.   We...

There was yet another small quake in northwest Arizona, along the southern end of the Intermountain Seismic Belt [right, red lines are act...

 Northwest Arizona had its fifth and sixth small earthquakes in the last week and a half, today just before noon. A magnitude 2.9 event at ...

We've had a small spate of small quakes in the northwest corner of the state this week with the fourth one occurring at 7:53 a.m, yest...

This blog passed the 2 million page views level today, so thanks to all of you readers.   It probably passed that point some time ...

Arizona's burgeoning wine industry is now showcased in a new online interactive Wine Trail Map, built here at AZGS as part of a new Ariz...

Three small earthquakes were recorded widely scattered across northwest Arizona in recent days [ right, yellow dots show epicenters of quake...

The Arizona [Phoenix] Republic newspaper published my editorial piece today on geologic hazards in Arizona.  This was prompted by the Black...

A magnitude 2.2 earthquake occurred last night at 8:33 p.m. about 13 miles north of Black Canyon City, Arizona, according to Jeri Young wh...

The USGS turned down our funding request to characterize the most active fault in Arizona to better understand earthquake hazards.   Ironica...

More than 4.6 million Arizonans live in the areas where people felt the ground shaking from last nights earthquakes near Black Canyon City, ...