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The AAPG/Datapages Combined Publications Database
Four Corners Geological Society
Abstract
Earthquake Activity In and Around Canyonlands National Park, Utah
Abstract
In July 1979, a program of microearthquake monitoring was initiated in an area encompassing Canyonlands National Park in southeastern Utah. Through 1985, a total of 989 earthquakes, ranging in Richter magnitude (ML) from less than 0.0 to 3.3, have been located in a region that was thought to have a very low level of seismicity. The earthquakes were widespread and generally diffuse in their occurrence, with some concentrations of events, most notably along a stretch of the Colorado River from the Confluence northeast to Moab. The events generally originated in the upper crust; however, some occurred in the lower crust and uppermost mantle. The seismicity appears to be the result of strike-slip and normal faulting on preexisting faults that have been reactivated in the contemporary extensional tectonic stress field of the Colorado Plateau.
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