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Bulletin of the Seismological Society of America; April 1985; v. 75; no. 2; p. 491-505
© 1985 Seismological Society of America
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Microseismicity of the Kaibab Plateau, northern Arizona, and its tectonic implications

JOYCE L. KRUGER-KNUEPFER*, MARC L. SBAR{dagger} and RANDALL M. RICHARDSON

DEPARTMENT OF GEOSCIENCES UNIVERSITY OF ARIZONA, TUCSON, ARIZONA 85721

Abstract

A microearthquake investigation of the Kaibab Plateau in northern Arizona revealed swarms of small to very small magnitude earthquakes. A 12-station network of portable seismographs recorded 296 events with magnitudes from –0.5 < ML < 2.5 during 6 weeks in the summer of 1981. Fifty-six of these events were large enough and close enough to the network to be recorded on four or more instruments. The microearthquakes ranged in depth from 5 to 20 km, and epicenters were spatially clustered near late Cenozoic surface faults. Hypocenters for the 56 located events, however, did not reveal individual faults. The compilation of T axes from these fault-plane solutions yields an average least principal horizontal stress direction of ENE-WSW. The inferred orientation of principal stresses found in this study indicates the Kaibab Plateau lies within a region of predominantly normal faulting which extends from central Arizona northward into southwestern Utah. Although data are sparse in the region surrounding the Kaibab Plateau, evidence for the location of a Basin-Range-Colorado Plateau stress boundary through the Kaibab Plateau is not supported by the results of this study.

Footnotes

* Present address: Snee Hall, Department of Geological Sciences, Cornell University, Ithaca, New York 14853.

{dagger} Present address: Sohio Petroleum, 1 Lincoln Center, Suite 1200, 5400 LBJ Freeway, Dallas, Texas 75240.




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