Undergraduate Thesis Or Project
 

Up-estuary extent and lithologic characteristics of tsunami deposits attributed to the 1700 Cascadia earthquake within Alsea Bay, OR

Public Deposited

Contenu téléchargeable

Télécharger le fichier PDF
https://ir.library.oregonstate.edu/concern/undergraduate_thesis_or_projects/mk61rn90f

Descriptions

Attribute NameValues
Creator
Abstract
  • Cascadia’s 1700 earthquake generated a tsunami and widespread subsidence along Pacific Northwest coastline. The tsunami deposited sandy sediments in many Oregon coastal estuaries, such as Alsea Bay. Although the recurrence of subduction-generated megathrust earthquakes and tsunami events in this region are recorded in the stratigraphy, knowledge of the full inland extent of inundation is limited. A series of eighty-one 25-mm gouge cores taken throughout Alsea Bay show a widespread distribution of buried gray sand at depths of 0.29 to 0.73 meters beneath the overlying tidal-influenced mixed alluvium. These fine-grained tsunami sands, ranging in thickness from 0.6 to 13.4-cm, demonstrate landward thinning from the Pacific Ocean at distances of seven kilometers inland along the Alsea River. The data gained in this study further fills the spatial gap in knowledge concerning tsunami sediment lithology and inundation extent along the central Oregon coast between the Salmon and the Coquille Rivers. Identification of tsunamigenic sediments and characteristics of their distribution within estuaries and bays constrain existing and future modeling of coastline inundation following rupture of the Cascadia Subduction Zone.
Contributor
Resource Type
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Academic Affiliation
Non-Academic Affiliation
Subject
Déclaration de droits
Publisher
Peer Reviewed
Language

Des relations

Parents:

This work has no parents.

Dans Collection:

Articles

La vignette Titre Date de téléchargement Visibilité actes
file details Alsea_Bay_Tsunami_Sedment.pdf 2018-06-08 Public Télécharger