Seismotectonics of the grand wash Arizona Area

Research output: Contribution to journalArticle

Abstract

The Grand Wash basin is located in northwest Arizona adjacent to the physiographic boundary of the Colorado plateau. The area is well mapped geologically and is geophysically similar to the Basin and Range and Transition Zone in structural style and history. The occurrence of a rare swarm of earthquakes in 2016 in the basin area served as an opportunity to perform a seismotectonic analysis of the Grand Wash basin. Results of the analysis indicate the basin is presently undergoing mild east west extension. The east west extension and associated seismicity of the swarm are here suggested to be the result of stress created by negative gravitational potential energy of the Colorado plateau relative to the lower Basin and Range and Transition Zone. This is suggested by the clockwise rotation of the extensional stress at about 36° N on both the plateau and the Basin and Range and Transition zone.

Original languageEnglish (US)
Pages (from-to)2277-2287
Number of pages11
JournalBulletin of the Seismological Society of America
Volume109
Issue number6
DOIs
StatePublished - Dec 1 2019

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seismotectonics
Potential energy
basin
Colorado Plateau (US)
Earthquakes
transition zone
plateau
potential energy
gravitational fields
seismicity
plateaus
earthquakes
histories
occurrences
earthquake
history

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

Cite this

Seismotectonics of the grand wash Arizona Area. / Brumbaugh, David S.

In: Bulletin of the Seismological Society of America, Vol. 109, No. 6, 01.12.2019, p. 2277-2287.

Research output: Contribution to journalArticle

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