For example, if you want to see the youngest and most active prehistoric faults, one would search for faults that have moved in the past 15,000 years at rates>5 mm/yr. Traces of our active volcanic past dot the Arizona landscape like spots on a dalmatian, with distinct volcanic fields near Flagstaff, north of Kingman, … There are many other active faults in northern Arizona, some of which are labeled … The New Madrid fault line is best known for some of the most violent earthquakes to ever hit the United States: a series of four in 1811 and 1812. Volcanoes of Arizona, USA - information / VolcanoDiscovery / VolcanoDiscovery. Rocks of this map unit are largely restricted to six areas widely distributed in Arizona: San Francisco and Uinkaret volcanic fields in northern Arizona (0-4 Ma); Springerville (0-4 Ma) and San Carlos (0-2 Ma) volcanic fields in east-central Arizona; and San Bernardino (0-1 Ma) and Sentinel (1-4 Ma) volcanic fields in southern Arizona. It is the most active seismic area east of the Rockies in the United States and runs from St. Louis to Memphis. Faults are seen cutting through practically every geologic layer in the canyon, from the oldest, two-billion-year-old Precambrian rocks through some of the most recent lava flows less than 10,000 years old. Earthquake faults Earht quakes occur when rocks making up the Eas crrht’ ust srat in and rupurt e. The rupture occurs on planes of weakness comprising crushed and broken rock that geologists refer to as faults (Fig. The fault west of Yuma and a fault in northern Arizona are capable of ripping a magnitude 7.0 to 7.5 earthquake. 3). There is an interactive map application to view the faults online and a seperate database search function. Surprising to some is the fact that there are several active fault lines around the region. Figure 2: Map showing major fault zones in northwestern Arizona: WFZ -Washington Fault Zone, HF - Hurricane Fault, STF - Sevier-Toroweap Fault, and GWF - Grand Wash Fault. Compare that with the more active and well known San Andreas Fault with a slip rate of 37 mm per year. Arizona possesses dozens of young, active faults; mostly normal faults that accommodate extensional Arizona Active Faults Metadata Updated: April 9, 2015 This dataset is a compilation of Active Fault features compiled by the Arizona Geological Survey and United States Geological Survey, published as a Web feature service, a web map service, an ESRI service and as a downloadable document for the National Geothermal Data System. Arizona - Active Faults - Arizona Geological Survey This layer summarizes available data on active Arizona faults. Geologists continue to study earthquakes and faults in Arizona and Mexico. KML (Google Earth-type) files and GIS shape files are also available for download from the site. Using the method developed by Wells and Coppersmith, geologists have estimated that the Carefree Fault Zone could produce earthquakes in the magnitude of 6.3-6.5. The slip rate of this fault is small, approximately 2 mm per year. The amount of movement measured on the faults varies from 15 feet to 16,000 feet. Quakes strong enough to be felt do occur and in Southeastern Arizona are taken seriously. The New Madrid fault in the central United States is particularly dangerous. If faults have been active during the past 2.5 million years (Quaternary period), then we consider that there is some chance they could generate large earthquakes.

Search Strategies The database has two search forms. An online map of United States Quaternary faults (faults that have been active in the last 1.6 million years) is available via the Quaternary Fault and Fold Database.

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