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Paleotsunami Inundation of a Beach Ridge Plain : Cobble Ridge Overtopping and Interridge Valley Flooding in Seaside, Oregon, USA
Joint Authors
Jol, Harry M.
Horning, Tom
Peterson, Curt D.
Cruikshank, Kenneth M.
Source
Journal of Geological Research
Issue
Vol. 2010, Issue 2010 (31 Dec. 2010), pp.1-22, 22 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2010-09-29
Country of Publication
Egypt
No. of Pages
22
Main Subjects
Earth Science , Water and Environment
Abstract EN
The Seaside beach ridge plain was inundated by six paleotsunamis during the last ~2500 years.
Large runups (adjusted >10 m in height) overtopped seawardmost cobble beach ridges (7 m elevation) at ~1.3 and ~2.6 ka before present.
Smaller paleotsunami (6–8 m in height) likely entered the beach plain interior (4-5 m elevation) through the paleo-Necanicum bay mouth.
The AD 1700 Cascadia paleotsunami had a modest runup (6-7 m height), yet it locally inundated to 1.5 km landward distance.
Bed shear stresses (100–3,300 dyne cm−2) are estimated for paleotsunami surges (0.5–2 m depths) that flowed down slopes (0.002–0.017 gradient) on the landward side of the cobble beach ridges.
Critical entrainment shear stresses of 1,130–1,260 dyne cm−2 were needed to dislodge the largest clasts (26–32 cm diameter) in paleotsunami coulees that were cut (100–200 m width) into the landward side of the cobble ridges.
American Psychological Association (APA)
Peterson, Curt D.& Jol, Harry M.& Horning, Tom& Cruikshank, Kenneth M.. 2010. Paleotsunami Inundation of a Beach Ridge Plain : Cobble Ridge Overtopping and Interridge Valley Flooding in Seaside, Oregon, USA. Journal of Geological Research،Vol. 2010, no. 2010, pp.1-22.
https://search.emarefa.net/detail/BIM-459690
Modern Language Association (MLA)
Peterson, Curt D.…[et al.]. Paleotsunami Inundation of a Beach Ridge Plain : Cobble Ridge Overtopping and Interridge Valley Flooding in Seaside, Oregon, USA. Journal of Geological Research No. 2010 (2010), pp.1-22.
https://search.emarefa.net/detail/BIM-459690
American Medical Association (AMA)
Peterson, Curt D.& Jol, Harry M.& Horning, Tom& Cruikshank, Kenneth M.. Paleotsunami Inundation of a Beach Ridge Plain : Cobble Ridge Overtopping and Interridge Valley Flooding in Seaside, Oregon, USA. Journal of Geological Research. 2010. Vol. 2010, no. 2010, pp.1-22.
https://search.emarefa.net/detail/BIM-459690
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-459690