Are great Cascadia earthquakes recorded in the sedimentary records from small forearc lakes?

Morey, AE; Goldfinger, C; Briles, CE; Gavin, DG; Colombaroli, Daniele; Kusler, JE (2013). Are great Cascadia earthquakes recorded in the sedimentary records from small forearc lakes? Natural Hazards and Earth System Sciences, 13(10), pp. 2441-2463. Copernicus Publications 10.5194/nhess-13-2441-2013

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Here we investigate sedimentary records from four small inland lakes located in the southern Cascadia forearc region for evidence of earthquakes. Three of these lakes are in the Klamath Mountains near the Oregon–California border, and one is in the central Oregon Coast range. The sedimentary sequences recovered from these lakes are composed of normal lake sediment interbedded with disturbance event layers. The thickest of these layers are graded, and appear to be turbidites or linked debrites (turbidites with a basal debris-flow deposit), suggesting rapid deposition. Variations in particle size and organic content of these layers are reflected in the density and magnetic susceptibility data. The frequency and timing of these events, based on radiocarbon ages from detrital organics, is similar to the offshore seismogenic turbidite record from trench and slope basin cores along the Cascadia margin. Stratigraphic correlation of these anomalous deposits based on radiocarbon ages, down-core density, and magnetic susceptibility data between lake and offshore records suggest synchronous triggering. The areal extent and multiple depositional environments over which these events appear to correlate suggest that these deposits were most likely caused by shaking during great Cascadia earthquakes.

Item Type:

Journal Article (Original Article)

Division/Institute:

10 Strategic Research Centers > Oeschger Centre for Climate Change Research (OCCR)
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS) > Palaeoecology
08 Faculty of Science > Department of Biology > Institute of Plant Sciences (IPS)

UniBE Contributor:

Colombaroli, Daniele

Subjects:

500 Science > 550 Earth sciences & geology
500 Science > 580 Plants (Botany)

ISSN:

1561-8633

Publisher:

Copernicus Publications

Language:

English

Submitter:

Peter Alfred von Ballmoos-Haas

Date Deposited:

31 Mar 2014 15:49

Last Modified:

26 Jun 2016 01:48

Publisher DOI:

10.5194/nhess-13-2441-2013

BORIS DOI:

10.7892/boris.45007

URI:

https://boris.unibe.ch/id/eprint/45007

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