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TitleDeep intraslab earthquakes and how they contribute to seismic hazard in the Pacific northwestern U.S.
DownloadDownload (whole publication)
AuthorPetersen, M D; Frankel, A D
SourceThe Cascadia subduction zone and related subduction systems - seismic structure, intraslab earthquakes and processes, and earthquake hazards; by Kirby, S (ed.); Wang, K (ed.); Dunlop, S (ed.); Geological Survey of Canada, Open File 4350, 2002 p. 159-162, (Open Access)
LinksOnline - En ligne
Alt SeriesUnited States Geological Survey, Open-file Report 02-328
PublisherNatural Resources Canada
MeetingIntraslab Earthquakes in the Cascadia Subduction System: Science and Hazards; Victoria; CA; September 18-21, 2000
Documentopen file
Mediaon-line; digital
RelatedThis publication is contained in Kirby, S; Wang, K; Dunlop, S; (2002). The Cascadia subduction zone and related subduction systems - seismic structure, intraslab earthquakes and processes, and earthquake hazards, Geological Survey of Canada, Open File 4350
File formatpdf
ProvinceWestern offshore region
NTS92A; 92B
AreaGeorgia Strait; Puget Sound; Juan de Fuca Sound; United States; Canada
Lat/Long WENS-126.0000 -120.0000 50.0000 41.0000
Subjectstectonics; geophysics; subduction zones; plate tectonics; tectonic elements; tectonic environments; tectonic interpretations; plate motions; subduction; lithosphere; oceanic lithosphere; earthquake mechanisms; earthquake studies; earthquakes; seismicity; earthquake magnitudes; mantle; Cascadia Subduction Zone; Juan de Fuca Plate; Cascadia Forearc; geological hazards; intraslab earthquakes
Illustrationssketch maps; pie charts
Released2002 06 11; 2016 08 31
AbstractWe investigate the impact of two different source and attenuation models for deep intraslab earthquakes to the seismic hazard along the northwestern coast of the United States. Different source models for deep intraslab earthquakes may cause either localized hazard in the lower Puget Sound of Washington and northwestern California, or hazard that is spread out parallel to the Cascadia subduction zone. These source models result in hazard estimates for 2% probability of exceedance in 50 years that differ by as much as 25% near Portland, Oregon. Applying maximum magnitudes (M=7.0 - 7.4) to the intraslab source model results in differences of less than 10% for
the hazard estimates in the Pacific Northwest. Attenuation models [e.g., Youngs et al., 1997; Atkinson and Boore, this volume] that relate the earthquake magnitude and distance to the ground motion, lead to differences of 50% in hazard for one second spectral acceleration near the earthquake sources. The variability in hazard for different source models and attenuation relations indicates the importance of identifying the physical mechanisms that drive the intraslab events and understanding the variability in the ground motions.