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| Titel |
Structure, stability, and tsunami hazard associated with a rock slope in Knight Inlet, British Columbia |
| VerfasserIn |
D. P. Zeyl, D. Stead, M. Sturzenegger, B. D. Bornhold, J. J. Clague |
| 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 Sciences ; 15, no. 6 ; Nr. 15, no. 6 (2015-06-30), S.1425-1436 |
| Datensatznummer |
250119547
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| Publikation (Nr.) |
 copernicus.org/nhess-15-1425-2015.pdf |
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| Zusammenfassung |
| Rockfalls and rockslides during the past 12 000 years have deposited
bouldery debris cones on the seafloor beneath massive rock slopes throughout
the inner part of Knight Inlet. The 885 m high rock slope, located across
from a former First Nations village destroyed in the late 1500s by a
slide-induced wave, exposes the contact between a Late Cretaceous dioritic
pluton and metamorphic rocks of the Upper Triassic Karmutsen Formation. The
pluton margin is strongly foliated parallel to primary and secondary fabrics
in the metamorphic rocks, resulting in highly persistent brittle structures.
Other important structures include a set of sheeting joints and highly
persistent mafic dykes and faults. Stability analysis indicates that planar
and wedge rock slope failures up to about 500 000 m3 in volume
could occur. We suspect that failures of this size in this setting would have
the potential to generate locally hazardous waves. As several similar rock
slopes fronted by large submarine debris cones exist in the inner part of
Knight Inlet, it is clear that tsunami hazards should be considered in
coastal infrastructure development and land-use planning in this area. |
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