TY - JOUR
T1 - Assessing local impacts of the 1700 CE Cascadia earthquake and tsunami using tree-ring growth histories
T2 - a case study in South Beach, Oregon, USA
AU - Dziak, Robert P.
AU - Black, Bryan A.
AU - Wei, Yong
AU - Merle, Susan G.
N1 - Publisher Copyright:
© 2021 Robert P. Dziak et al.
PY - 2021/6/30
Y1 - 2021/6/30
N2 - 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 g1/4220 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.
AB - 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 g1/4220 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.
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U2 - 10.5194/nhess-21-1971-2021
DO - 10.5194/nhess-21-1971-2021
M3 - Article
AN - SCOPUS:85111952135
SN - 1561-8633
VL - 21
SP - 1971
EP - 1982
JO - Natural Hazards and Earth System Sciences
JF - Natural Hazards and Earth System Sciences
IS - 6
ER -