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Map of Active Faults, Earthquakes, and Seismograph Stations in Arizona

Map of active faults, earthquakes, and seismograph stations in Arizona.

Each year hundreds of unfelt and several felt earthquakes are recorded in Arizona. These earthquakes generally occur within a swath from the north-northwestern to the southeastern part of the state. The Yuma area (southwestern corner of the state) also has earthquakes. Most earthquake activity is located within 8–16 km (5–10 mi) of known faults. The closest active faults to the monument are approximately 100 km (60 mi) to the west (near Gila Bend) and about 90 km (60 mi) to the east (near Mammoth). This map also delineates Modified Mercalli Scale intensities of the 1887 Sonoran earthquake, 1940 Imperial Valley earthquake in southern California (felt in the Yuma area), and three magnitude 6 earthquakes in the early 1900s, which caused damage in the Flagstaff–Grand Canyon region. These show that the state has been subject to intensities of up to IX.

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Graphic by Trista Thornberry-Ehrlich (Colorado State University) using AZGS graphics and data available at http://azgs.arizona.edu/center-natural-hazards/earthquakes, http://data.azgs.az.gov/hazard-viewer/, and http://www.azgs.az.gov/eq_monitor.shtml (acce

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Casa Grande Ruins National Monument, Code: CAGR

Casa Grande Ruins National Monument, Pinal County, Arizona
Latitude: 32.996898651123, Longitude: -111.532997131348

NPS.gov Collection

01/01/0001

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Wednesday, July 21, 2021 2:09:33 PM

Wednesday, July 21, 2021 2:41:57 PM

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