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| Titel |
Influence of tectonic folding on rockfall susceptibility, American Fork Canyon, Utah, USA |
| VerfasserIn |
J. A. Coe, E. L. Harp |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 7, no. 1 ; Nr. 7, no. 1 (2007-01-10), S.1-14 |
| Datensatznummer |
250004322
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| Publikation (Nr.) |
 copernicus.org/nhess-7-1-2007.pdf |
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| Zusammenfassung |
| 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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