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Compiled onshore and offshore paleoseismic data along the Cascadia Subduction zone

Staisch, Lydia; Witter, Robert; Watt, Janet; Grant, Alex; Walton, Maureen; Brothers, Daniel; Davis, Elizabeth; Dura, Cristina; Engelhart, Simon; Enkin, Randolf; Garrison-Laney, Carolyn; Goldfinger, Christopher; Hamilton, Tark; Hawkes, Andrea; Hill, Jenna; Hong, Isabel; Jaffe, Bruce; Kelsey, Harvey; Lahusen, Sean; La Selle, SeanPaul; Nelson, Alan; Nieminski, Nora; Padgett, Jason; Patton, Jason; Pearl, Jessie; Pilarczyk, Jessica; Sherrod, Brian; Stanton, Kelsay

Authors

Lydia Staisch

Robert Witter

Janet Watt

Alex Grant

Maureen Walton

Daniel Brothers

Elizabeth Davis

Cristina Dura

Randolf Enkin

Carolyn Garrison-Laney

Christopher Goldfinger

Tark Hamilton

Andrea Hawkes

Jenna Hill

Isabel Hong

Bruce Jaffe

Harvey Kelsey

Sean Lahusen

SeanPaul La Selle

Alan Nelson

Nora Nieminski

Jason Padgett

Jason Patton

Jessie Pearl

Jessica Pilarczyk

Brian Sherrod

Kelsay Stanton



Abstract

The USGS Powell Center Cascadia earthquake hazards working group compiled published onshore and offshore paleoseismic data along the Cascadia subduction zone, spanning sites from Vancouver Island to the Mendocino triple junction. Evidence for megathrust rupture includes coastal land-level change, tsunami inundation, onshore shaking proxies such as landslides or liquefaction, and offshore shaking proxies such as marine turbidites. The quality of paleoseismic data for megathrust rupture along the Cascadia subduction zone collected over the past three decades varies because analytical capabilities and data collection methodologies have evolved. Thus, as part of the compilation, we also present a ranking scheme to assess the quality of age estimates and evidence for great megathrust rupture. With the age ranking scheme, we ask: "How well is a proposed paleoseismic event dated?" based on the materials and methods used. With the evidence ranking scheme, we ask: "How confident are we that a proposed event is, in fact, the result of a Cascadia megathrust rupture?" based on the sedimentological characteristics, correlation, and mapping. The evidence ranking scheme also helps to evaluate possible alternative mechanisms for creating paleoseismic evidence such as crustal fault, intraslab, or distant tsunamigenic earthquake.

Citation

Staisch, L., Witter, R., Watt, J., Grant, A., Walton, M., Brothers, D., Davis, E., Dura, C., Engelhart, S., Enkin, R., Garrison-Laney, C., Goldfinger, C., Hamilton, T., Hawkes, A., Hill, J., Hong, I., Jaffe, B., Kelsey, H., Lahusen, S., La Selle, S., …Stanton, K. (2024). Compiled onshore and offshore paleoseismic data along the Cascadia Subduction zone. [Data]. https://doi.org/10.5066/P13OJQYW

Online Publication Date Mar 4, 2024
Publication Date Mar 4, 2024
Deposit Date Apr 24, 2024
DOI https://doi.org/10.5066/P13OJQYW
Public URL https://durham-repository.worktribe.com/output/2395697
Collection Date Mar 4, 2024