Assessing local impacts of the 1700 CE Cascadia earthquake and tsunami using tree-ring growth histories: a case study in South Beach, Oregon, USA

Dziak, Robert P.; Black, Bryan A.; Wei, Yong; Merle, Susan G.

doi:10.5194/nhess-21-1971-2021

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Assessing local impacts of the 1700 CE Cascadia earthquake and tsunami using tree-ring growth histories: a case study in South Beach, Oregon, USA

2021
By Dziak, Robert P. ; Black, Bryan A. ; Wei, Yong ; ...
Source: Nat. Hazards Earth Syst. Sci., 21, 1971–1982

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Journal Title:

Natural Hazards and Earth System Sciences
Personal Author:

Dziak, Robert P. ; Black, Bryan A. ; Wei, Yong ; Merle, Susan G.

Dziak, Robert P. ; Black, Bryan A. ; Wei, Yong ; Merle, Susan G. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) ; CIMRS (Cooperative Institute for Marine Resources Studies)

OAR (Oceanic and Atmospheric Research) ; PMEL (Pacific Marine Environmental Laboratory) ; CIMRS (Cooperative Institute for Marine Resources Studies) Less -
Description:

We present an investigation of the disturbance history of an old-growth Douglas-fir (Pseudotsuga menziesii) stand in South Beach, Oregon, for possible growth changes due to tsunami inundation caused by the 1700 CE Cascadia Subduction Zone (CSZ) earthquake. A high-resolution model of the 1700 tsunami run-up heights at South Beach, assuming an “L”-sized earthquake, is also presented to better estimate the inundation levels several kilometers inland at the old-growth site. This tsunami model indicates the South Beach fir stand would have been subjected to local inundation depths from 0 to 10 m. Growth chronologies collected from the Douglas-fir stand shows that trees experienced a significant growth reductions in the year 1700 relative to nearby Douglas-fir stands, consistent with the tsunami inundation estimates. The ±1–3-year timing of the South Beach disturbances are also consistent with disturbances previously observed at a Washington state coastal forest ∼220 km to the north. Moreover, the 1700 South Beach growth reductions were not the largest over the >321-year tree chronology at this location, with other disturbances likely caused by climate drivers (e.g., drought or windstorms). Our study represents a first step in using tree growth history to ground truth tsunami inundation models by providing site-specific physical evidence.
Keywords:

[+]

Earthquakes Tsunamis Distrubance History Innundation Tree Ring Growth
Source:

Nat. Hazards Earth Syst. Sci., 21, 1971–1982
DOI:

https://doi.org/10.5194/nhess-21-1971-2021
Document Type:

Journal Article
Place as Subject:

Oregon
Rights Information:

CC BY
Compliance:

Submitted
Main Document Checksum:

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urn:sha256:679bc159ee5f88fc82bbce4c4a19fdb9f4fd164f16d5e2c3ee0b093948733200
Download URL:

https://repository.library.noaa.gov/view/noaa/33423/noaa_33423_DS1.pdf
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