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TitleTheoretical mineralogy, density, seismic wavespeeds and H2O content of the Cascadia subduction zone, with implications for intermediate-depth seismicity and earthquake hazard
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AuthorHacker, B R; Abers, G A; Peacock, S M
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. 133-137, https://doi.org/10.4095/222538 (Open Access)
LinksOnline - En ligne
Year2002
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
Lang.English
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 -122.0000 49.0000 47.0000
Subjectstectonics; geophysics; mineralogy; subduction zones; plate tectonics; tectonic elements; tectonic environments; tectonic interpretations; plate motions; subduction; lithosphere; oceanic lithosphere; earthquake mechanisms; earthquake studies; earthquakes; seismicity; rock density analyses; thermal dehydration; seismic velocities; models; modelling; Cascadia Subduction Zone; Juan de Fuca Plate; Cascadia Forearc; geological hazards; intraslab earthquakes
Illustrationsplots; graphs
Released2002 06 11; 2016 08 31
AbstractWe calculate physical properties of rocks in subduction zones using a compilation of mineral physical property measurements, a new set of phase diagrams and subduction-zone thermal models, and apply our results to Cascadia. Observed P-wave speeds of the Juan de Fuca plate west of the Cascadia trench are best matched by a greenschist-facies upper crust and metastable, partially hydrated lower crust and mantle. The predicted positions of dehydration reactions in the subducting crust show a spatial link to observed seismicity, suggesting that dehydration may be the cause of the earthquakes and that the predicted location of dehydration reactions in the slab can
be used to predict hazardous seismicity the length of Cascadia.
GEOSCAN ID222538