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

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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.
  • This is the publisher’s final pdf. The published article is copyrighted by the author(s) and published by Copernicus Publications on behalf of the European Geosciences Union. The published article can be found at: http://www.natural-hazards-and-earth-system-sciences.net/.
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  • Morey, A. E., Goldfinger, C., Briles, C. E., Gavin, D. G., Colombaroli, D., and Kusler, J. E.: Are great Cascadia earthquakes recorded in the sedimentary records from small forearc lakes?, Natural Hazards and Earth System Sciences, 13, 2441-2463, doi:10.5194/nhess-13-2441-2013, 2013.
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  • 13
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  • 10
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  • The initial funding for this study was provided by the Coastal and Marine Geology Team of the US Geological Survey. The primary funding for field work and subsequent research has been provided by NSF Awards EAR 9803081 EAR-0001074, EAR-0107120, EAR-0440427 and OCE-0550843 (reservoir model development) and OCE 0850931 (2009 cruise). US Geological Survey substantially supported the work through Cooperative Agreements 6-7440-4790, 98HQAG2206 and 99HQAG0192; and US Geological Survey National Earthquake Hazard Reduction Program grants 02HQGR0019, 03HQGR0037, 06HQGR0149, 07HQGR0064 to Goldfinger, and 02HQGR0043, 03HQGR0006, 06HQGR0020 to Nelson. The American Chemical Society awarded support to PhD student Joel Johnson for core collection and analysis at Hydrate Ridge under ACS PRF 37688-AC8.
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