Lydia Staisch
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
Robert Witter
Janet Watt
Alex Grant
Maureen Walton
Daniel Brothers
Elizabeth Davis
Cristina Dura
Dr Simon Engelhart simon.e.engelhart@durham.ac.uk
Associate Professor
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 |
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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 |
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