Plio-Quaternary Faulting and Seismic Hazard in the Flagstaff Area, Northern Arizona

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Author
Pearthree, P. A.
Vincent, K.R.
Brazier, R.
Hendricks, D.M.
Issue Date
1996
Keywords
earthquake
fault
geohazard
Lake Mary fault
Holocene
Pliocene
Quaternary
Tertiary
Bellmont
Coconino County

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Citation
Pearthree, P.A., Vincent, K.R., Brazier, R., Hendricks, D.M., 1996, Plio-Quaternary Faulting and Seismic Hazard in the Flagstaff Area, Northern Arizona
Publisher
Arizona Geological Survey (Tucson, AZ)
Description
Historical seismic activity and the geologic record of young faulting both suggest that there is significant seismic hazard in the Flagstaff area. Geologic investigations of young faults provide information about large prehistoric earthquakes in an area, which can be used with the historical seismic record to evaluate the potential for dam­aging earthquakes. In this report, we provide a perspective on seismic hazard in the Flagstaff area based primarily on geologic assessments of the potentially active faults in the area. Much of our effort was devoted to a detailed paleoseismologic investigation of the Bellemont fault west of Flag­staff. We augmented this study with a reconnais­sance survey of other faults in the area that have been active during the past 5 million years. This fault data was integrated into several alternative probabilistic assessments of seismic hazard in the Flagstaff area. The Bellemont fault is an active fault capable of producing large earthquakes. The magnitude of the youngest surface-rupturing earthquake on the fault was probably 6.6 to 6.9, which may be characteristic of previous surface ruptures on the fault. The average slip rate during the past 300,000 to 700,000 years is between 0.015 to 0.04 m/ky (ky means thousands of years).
URI
http://hdl.handle.net/10150/667725
Additional Links
https://library.azgs.arizona.edu/
Language
en
Series/Report no.
Bulletin 200|B-200
Rights
Arizona Geological Survey. All rights reserved.
Collection Information
Documents in the AZGS Documents Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu.
North Bounding Coordinate
35.5545
South Bounding Coordinate
34.9084
West Bounding Coordinate
-112.083
East Bounding Coordinate
-111.204
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