Stratigraphic and microfossil evidence for a 4500-year history of Cascadia subduction zone earthquakes and tsunamis at Yaquina River estuary, Oregon, USA

2014 ◽  
Vol 127 (1-2) ◽  
pp. 211-226 ◽  
Author(s):  
Nicholas A. Graehl ◽  
Harvey M. Kelsey ◽  
Robert C. Witter ◽  
Eileen Hemphill-Haley ◽  
Simon E. Engelhart
Keyword(s):  
Subduction Zone ◽  
River Estuary ◽  
Cascadia Subduction Zone ◽  
History Of ◽  
Subduction Zone Earthquakes

AN INCOMPLETE HISTORY OF LATE HOLOCENE GREAT EARTHQUAKES AT THE NEHALEM RIVER ESTUARY, CENTRAL CASCADIA SUBDUCTION ZONE

2017 ◽  
Author(s):  
Alan R. Nelson ◽  
◽  
Yuki Sawai ◽  
Andrea D. Hawkes ◽  
Simon E. Engelhart ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Late Holocene ◽  
River Estuary ◽  
Cascadia Subduction Zone ◽  
Great Earthquakes ◽  
History Of

Subduction zone heterogeneity observed across the magnitude spectrum for megathrust earthquakes

2021 ◽  
Author(s):  
Susan Bilek ◽  
Emily Morton
Keyword(s):  
Spatial Heterogeneity ◽  
Subduction Zone ◽  
Stress Drop ◽  
Subduction Zones ◽  
Cascadia Subduction Zone ◽  
Ocean Bottom ◽  
Small Earthquake ◽  
Megathrust Earthquakes ◽  
Seismic Slip ◽  
Subduction Zone Earthquakes

<p>Observations from recent great subduction zone earthquakes highlight the influence of spatial geologic heterogeneity on overall rupture characteristics, such as areas of high co-seismic slip, and resulting tsunami generation.  Defining the relevant spatial heterogeneity is thus important to understanding potential hazards associated with the megathrust. The more frequent, smaller magnitude earthquakes that commonly occur in subduction zones are often used to help delineate the spatial heterogeneity.  Here we provide an overview of several subduction zones, including Costa Rica, Mexico, and Cascadia, highlighting connections between the small earthquake source characteristics and rupture behavior of larger earthquakes.  Estimates of small earthquake locations and stress drop are presented in each location, utilizing data from coastal and/or ocean bottom seismic stations.  These seismicity characteristics are then compared with other geologic and geophysical parameters, such as upper and lower plate characteristics, geodetic locking, and asperity locations from past large earthquakes.  For example, in the Cascadia subduction zone, we find clusters of small earthquakes located in regions of previous seamount subduction, with variations in earthquake stress drop reflecting potentially disrupted upper plate material deformed as a seamount passed.  Other variations in earthquake location and stress drop can be correlated with observed geodetic locking variations. </p>

Confidence levels for tsunami-inundation limits in northern Oregon inferred from a 10,000-year history of great earthquakes at the Cascadia subduction zone

2009 ◽  
Vol 54 (1) ◽  
pp. 27-73 ◽  
Author(s):  
George R. Priest ◽  
Chris Goldfinger ◽  
Kelin Wang ◽  
Robert C. Witter ◽  
Yinglong Zhang ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Cascadia Subduction Zone ◽  
Tsunami Inundation ◽  
Confidence Levels ◽  
Great Earthquakes ◽  
History Of

Tsunami history of an Oregon coastal lake reveals a 4600 yr record of great earthquakes on the Cascadia subduction zone

2005 ◽  
Vol 117 (7) ◽  
pp. 1009 ◽  
Author(s):  
Harvey M. Kelsey ◽  
Alan R. Nelson ◽  
Eileen Hemphill-Haley ◽  
Robert C. Witter
Keyword(s):  
Subduction Zone ◽  
Cascadia Subduction Zone ◽  
Coastal Lake ◽  
Great Earthquakes ◽  
History Of

THE TIMING AND DEFORMATION OF CASCADIA SUBDUCTION ZONE EARTHQUAKES FROM COASTAL MARSH RECORDS OF OREGON

2017 ◽  
Author(s):  
Simon E. Engelhart ◽  
◽  
Niamh Cahill ◽  
Andrea Hawkes ◽  
Benjamin P. Horton ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Coastal Marsh ◽  
Cascadia Subduction Zone ◽  
Subduction Zone Earthquakes

DIATOM VARIABILITY IN TIDAL-MARSH ENVIRONMENTS: IMPLICATIONS FOR CONSTRAINING LAND-LEVEL CHANGE FROM CASCADIA SUBDUCTION ZONE EARTHQUAKES

2017 ◽  
Author(s):  
Isabel Hong ◽  
◽  
Benjamin P. Horton ◽  
Simon E. Engelhart ◽  
J. Scott Padgett ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Tidal Marsh ◽  
Cascadia Subduction Zone ◽  
Level Change ◽  
Subduction Zone Earthquakes

Inelastic Structural Response to Cascadia Subduction Zone Earthquakes

1995 ◽  
Vol 11 (1) ◽  
pp. 63-89 ◽  
Author(s):  
M. Lee Marsh ◽  
Christopher M. Gianotti
Keyword(s):  
Subduction Zone ◽  
Structural Response ◽  
Degree Of Freedom ◽  
Cascadia Subduction Zone ◽  
Single Degree Of Freedom ◽  
Single Degree ◽  
Energy Demands ◽  
Cyclic Displacement ◽  
Energy Dissipated ◽  
Subduction Zone Earthquakes

The effects of postulated Cascadia subduction zone earthquakes on inelastic structural response are examined. The earthquakes considered ranged in size from those previously recorded to the largest plausible event, a magnitude 9.5 earthquake. Artificial acceleration records were generated and used as input for inelastic response history analyses of single-degree-of-freedom systems with bilinear or degrading stiffness hysteretic relationships. The results indicate that the maximum displacements are not significantly greater than those produced by previously recorded events. The inelastic energy dissipated and the numbers of displacement cycles are somewhat greater for the largest events, although the energy demands and the cyclic displacement demands are similar to those from the recorded events for magnitudes up to 8.5.

scholarly journals Correction to: New constraints on coseismic slip during southern Cascadia subduction zone earthquakes over the past 4600 years implied by tsunami deposits and marine turbidites

2018 ◽  
Vol 93 (2) ◽  
pp. 1109-1111
Author(s):  
George R. Priest ◽  
Robert C. Witter ◽  
Yinglong J. Zhang ◽  
Chris Goldfinger ◽  
Kelin Wang ◽  
...  
Keyword(s):  
Subduction Zone ◽  
Cascadia Subduction Zone ◽  
Tsunami Deposits ◽  
Coseismic Slip ◽  
The Past ◽  
Subduction Zone Earthquakes
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