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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 7, issue 1 | Copyright
Nat. Hazards Earth Syst. Sci., 7, 1-14, 2007
https://doi.org/10.5194/nhess-7-1-2007
© Author(s) 2007. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  10 Jan 2007

10 Jan 2007

Influence of tectonic folding on rockfall susceptibility, American Fork Canyon, Utah, USA

J. A. Coe and E. L. Harp J. A. Coe and E. L. Harp
  • U.S. Geological Survey, Denver Federal Center, MS 966, Denver, CO, 80225, USA

Abstract. We examine rockfall susceptibility of folded strata in the Sevier fold-thrust belt exposed in American Fork Canyon in north-central Utah. Large-scale geologic mapping, talus production data, rock-mass-quality measurements, and historical rockfall data indicate that rockfall susceptibility is correlated with limb dip and curvature of the folded, cliff-forming Mississippian limestones. On fold limbs, rockfall susceptibility increases as dip increases. This relation is controlled by several factors, including an increase in adverse dip conditions and apertures of discontinuities, and shearing by flexural slip during folding that has reduced the friction angles of discontinuities by smoothing surface asperities. Susceptibility is greater in fold hinge zones than on adjacent limbs primarily because there are greater numbers of discontinuities in hinge zones. We speculate that susceptibility increases in hinge zones as fold curvature becomes tighter.

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