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TitleCascadia upper plate faulting in the San Juan-south Gulf Islands archipelagos
AuthorGreene, H G; Barrie, V; Todd, B J; Conway, K
SourceGeological Society of America, Abstracts With Programs 2017, 384-6, 2017 p. 1, https://doi.org/10.1130/abs/2017AM-297435
Year2017
Alt SeriesNatural Resources Canada, Contribution Series 20170182
PublisherGeological Society of America
MeetingGeological Society of America Annual Meeting 2017; Seattle, WA; US; October 22-25, 2017
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf; html
ProvinceBritish Columbia; Western offshore region
NTS92B; 92G/01; 92G/02; 92G/03; 92G/04; 92G/05; 92G/06; 92G/07; 92G/08
AreaGulf Islands; Washington State; San Juan Islands; Canada; United States
Lat/Long WENS-124.0000 -122.0000 49.5000 48.0000
Subjectstectonics; marine geology; geophysics; structural geology; plate tectonics; plate margins; crustal movements; bedrock geology; structural features; fault zones; faults; fractures; deformation; geophysical surveys; acoustic surveys, marine; seismic surveys, marine; seismic reflection surveys; seismic profiles, marine; structural analyses; landslides; mass wasting; tsunami; earthquake risk; seismic risk; Cascadia Subduction Zone; Cascadia Forearc; Devil's Mountain Fault Zone; Skipjack Island Fault Zone; Lopez Fracture Zone; geological hazards
ProgramPublic Safety Geoscience - Coordination, Public Safety Geoscience
Released2017 10 01
AbstractThe collection of multibeam echosounder and marine seismic-reflection profiles within the San Juan Islands and Gulf Islands Archipelagos exhibit well defined fault zones and zones of deformation that cross the Cascadia forearc. Recent interpretation of these data provides a new and modified geometry of recent and past faulting within the Archipelagos. Previous structural mapping in the region was island and land based devoid of any marine data, but these new marine data and interpretations facilitate a better structural view. We present a comprehensive map of the geology that includes the Devil's Mountain and Skipjack Island fault zones, the Lopez Fracture zone, and intermediate faults that appear to facilitate rotation of the San Juan islands. In addition, the associated coastal and marine hazards of the region are presented with emphasis on local active faulting, mass wasting, and tsunami generation.
Summary(Plain Language Summary, not published)
Interpretation of seafloor geological information within the San Juan Islands and Gulf Islands Archipelagos reveals well-defined fault zones. Previous structural mapping in the region was land-based, thus these new marine data and interpretations facilitate a better structural view. We present a comprehensive map of the geology that includes the Devil¿s Mountain and Skipjack Island fault zones and the Lopez Fracture zone. In addition, the associated coastal and marine hazards of the region are presented with emphasis on local active faulting, landslides, and tsunami generation.
GEOSCAN ID305893