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Seattle, Portland, and Vancouver: Cascadia subduction zone
2015SCIENTISTS RECOGNIZE THE THREAT I had been working on earthquake hazards for seven years when I moved from Ohio to western Oregon in 1977. There was a sense of relief that I could study earthquakes while living in Ohio or Oregon and yet not worry about being in the path of an earthquake myself.
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A continuum of stress, strength and slip in the Cascadia subduction zone
Nature Geoscience, 2011Movement of the down-going oceanic plate in subduction zones is accommodated by earthquakes, slow slip and free slip with increasing depth. Analysis of accompanying tremor reveals a continuum of slow-slip events in the Cascadia subduction zone, which suggests that deep free slip of the subducted plate may cause stress to be gradually transferred up the
Aaron G. Wech, Kenneth C. Creager
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Upper mantle structure of the northern Cascadia subduction zone
Canadian Journal of Earth Sciences, 1995Previous knowledge of the structure of the Cascadia subduction zone north of the Canada–United States border has been derived from a variety of geophysical studies that accurately delineated the downgoing Juan de Fuca plate from the offshore deformation front to depths of ~50–60 km beneath south-central Vancouver Island and the Georgia Strait.
M. G. Bostock, J. C. Vandecar
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Ensemble ShakeMaps for Magnitude 9 Earthquakes on the Cascadia Subduction Zone
Seismological Research Letters, 2020AbstractWe develop ensemble ShakeMaps for various magnitude 9 (M 9) earthquakes on the Cascadia megathrust. Ground-shaking estimates are based on 30 M 9 Cascadia earthquake scenarios, which were selected using a logic-tree approach that varied the hypocenter location, down-dip rupture limit, slip distribution, and location of strong-motion-generating ...
Erin A. Wirth +3 more
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Episodic Tremor and Slip on the Cascadia Subduction Zone: The Chatter of Silent Slip
Science, 2003We found that repeated slow slip events observed on the deeper interface of the northern Cascadia subduction zone, which were at first thought to be silent, have unique nonearthquake seismic signatures. Tremorlike seismic signals were found to correlate temporally and spatially with slip events identified from crustal motion data spanning the past 6 ...
Garry, Rogers, Herb, Dragert
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Integrated geophysical modelling of the northern Cascadia subduction zone
2011The northern Cascadia subduction zone involves convergence of the Explorer Plate and northern part of the Juan de Fuca Plate with the North American Plate along a margin lying west of Vancouver Island, Canada. A wide accretionary complex which underlies the continental slope and shelf has been formed. Two allochthonous terranes, the Crescent Terrane of
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The Cascadia subduction zone: Two contrasting models of lithospheric structure
Physics and Chemistry of the Earth, 1998Abstract The Pacific margin of North America is one of the most complicated regions in the world in terms of its structure and present day geodynamic regime. The aim of this work is to develop a better understanding of lithospheric structure of the Pacific Northwest, in particular the Cascadia subduction zone of Southwest Canada and Northwest USA ...
T.V. Romanyuk, R. Blakely, W.D. Mooney
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Characterizing the Cascadia Subduction Zone for Seismic Hazard Assessments
2014As part of the BC Hydro PSHA project, a new seismic source model of the Cascadia subduction zone (CSZ) was developed using a logic tree approach. The most significant CSZ seismic source parameters are; the location of the eastern edge of the megathrust rupture zone, rupture zone segmentation, the northern limit of rupture, recurrence models, recurrence
Wong, Ivan +9 more
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Seismic reflection imaging of two megathrust shear zones in the northern Cascadia subduction zone
Nature, 2004At convergent continental margins, the relative motion between the subducting oceanic plate and the overriding continent is usually accommodated by movement along a single, thin interface known as a megathrust. Great thrust earthquakes occur on the shallow part of this interface where the two plates are locked together.
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