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Flood-triggered versus earthquake-triggered turbidites : a sedimentological study in clastic lake sediments (Eklutna Lake, Alaska)

(2020) SEDIMENTOLOGY. 67(1). p.364-389
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Abstract
Lake sediments in Eklutna Lake, Alaska, reveal the presence of turbidites within varved sequences. These turbidites, which result from flood events and earthquakes, show a similar macroscopic appearance. In order to use turbidites to reconstruct flood variability and/or seismic history in the lake basin, it is crucial to determine the trigger of the turbidity currents. This study examined the turbidite caused by the AD 1964 Great Alaska earthquake as well as turbidites linked to historical flood events in order to differentiate between these earthquake-triggered and flood-triggered turbidites. In a suite of samples from throughout the lake, distinctive proxies are identified that can be associated with event-specific flow characteristics. The study presents straightforward discrimination methods related to the sedimentology and geochemical components of the turbidites. These methods are also applicable to other lakes, particularly proglacial lakes where the sediment composition of onshore and offshore sources is similar. Finally, the discrimination of the turbidite trigger can be used to reconstruct the palaeoflood and seismic history.
Keywords
HISTORIC EARTHQUAKES, BRITISH-COLUMBIA, ORGANIC-MATTER, MASS-MOVEMENT, DENSITY FLOWS, SOUTHERN ALPS, RECORD, DEPOSITS, MARINE, FREQUENCY, Alaska, earthquake, flooding, lacustrine palaeoseismology, palaeoflood hydrology, turbidites, X-ray CT

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Citation

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MLA
Vandekerkhove, Elke, et al. “Flood-Triggered versus Earthquake-Triggered Turbidites : A Sedimentological Study in Clastic Lake Sediments (Eklutna Lake, Alaska).” SEDIMENTOLOGY, vol. 67, no. 1, 2020, pp. 364–89.
APA
Vandekerkhove, E., Van Daele, M., Praet, N., Cnudde, V., Haeussler, P. J., & De Batist, M. (2020). Flood-triggered versus earthquake-triggered turbidites : a sedimentological study in clastic lake sediments (Eklutna Lake, Alaska). SEDIMENTOLOGY, 67(1), 364–389.
Chicago author-date
Vandekerkhove, Elke, Maarten Van Daele, Nore Praet, Veerle Cnudde, Peter J. Haeussler, and Marc De Batist. 2020. “Flood-Triggered versus Earthquake-Triggered Turbidites : A Sedimentological Study in Clastic Lake Sediments (Eklutna Lake, Alaska).” SEDIMENTOLOGY 67 (1): 364–89.
Chicago author-date (all authors)
Vandekerkhove, Elke, Maarten Van Daele, Nore Praet, Veerle Cnudde, Peter J. Haeussler, and Marc De Batist. 2020. “Flood-Triggered versus Earthquake-Triggered Turbidites : A Sedimentological Study in Clastic Lake Sediments (Eklutna Lake, Alaska).” SEDIMENTOLOGY 67 (1): 364–389.
Vancouver
1.
Vandekerkhove E, Van Daele M, Praet N, Cnudde V, Haeussler PJ, De Batist M. Flood-triggered versus earthquake-triggered turbidites : a sedimentological study in clastic lake sediments (Eklutna Lake, Alaska). SEDIMENTOLOGY. 2020;67(1):364–89.
IEEE
[1]
E. Vandekerkhove, M. Van Daele, N. Praet, V. Cnudde, P. J. Haeussler, and M. De Batist, “Flood-triggered versus earthquake-triggered turbidites : a sedimentological study in clastic lake sediments (Eklutna Lake, Alaska),” SEDIMENTOLOGY, vol. 67, no. 1, pp. 364–389, 2020.
@article{8646969,
  abstract     = {Lake sediments in Eklutna Lake, Alaska, reveal the presence of turbidites within varved sequences. These turbidites, which result from flood events and earthquakes, show a similar macroscopic appearance. In order to use turbidites to reconstruct flood variability and/or seismic history in the lake basin, it is crucial to determine the trigger of the turbidity currents. This study examined the turbidite caused by the AD 1964 Great Alaska earthquake as well as turbidites linked to historical flood events in order to differentiate between these earthquake-triggered and flood-triggered turbidites. In a suite of samples from throughout the lake, distinctive proxies are identified that can be associated with event-specific flow characteristics. The study presents straightforward discrimination methods related to the sedimentology and geochemical components of the turbidites. These methods are also applicable to other lakes, particularly proglacial lakes where the sediment composition of onshore and offshore sources is similar. Finally, the discrimination of the turbidite trigger can be used to reconstruct the palaeoflood and seismic history.},
  author       = {Vandekerkhove, Elke and Van Daele, Maarten and Praet, Nore and Cnudde, Veerle and Haeussler, Peter J. and De Batist, Marc},
  issn         = {0037-0746},
  journal      = {SEDIMENTOLOGY},
  keywords     = {HISTORIC EARTHQUAKES,BRITISH-COLUMBIA,ORGANIC-MATTER,MASS-MOVEMENT,DENSITY FLOWS,SOUTHERN ALPS,RECORD,DEPOSITS,MARINE,FREQUENCY,Alaska,earthquake,flooding,lacustrine palaeoseismology,palaeoflood hydrology,turbidites,X-ray CT},
  language     = {eng},
  number       = {1},
  pages        = {364--389},
  title        = {Flood-triggered versus earthquake-triggered turbidites : a sedimentological study in clastic lake sediments (Eklutna Lake, Alaska)},
  url          = {http://dx.doi.org/10.1111/sed.12646},
  volume       = {67},
  year         = {2020},
}

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