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TitleComparing intensity variation of the 2001 Nisqually earthquake with geology in Victoria, British Columbia
AuthorMolnar, S; Cassidy, J FORCID logo; Dosso, S E
SourceBulletin of the Seismological Society of America vol. 94, no. 6, 2004 p. 2229-2238,
Alt SeriesGeological Survey of Canada, Contribution Series 2004040
PublisherSeismological Society of America (SSA)
Mediapaper; on-line; digital
File formatpdf
ProvinceBritish Columbia
NTS92B/05; 92B/06; 92B/11; 92B/12
AreaGreater Victoria; James Bay; Colwood Delta; Washington State; Olympia; Canada; United States of America
Lat/Long WENS-124.0000 -123.0000 48.7500 48.2500
Subjectsgeophysics; surficial geology/geomorphology; general geology; seismology; earthquakes; earthquake studies; seismic risk; seismic waves; mapping techniques; subsurface geology; surface geology; bedrock geology; tills; glacial deposits; clays; peat; subduction zones; soils; urban geology; urban planning; Pleistocene; Holocene; Nisqually earthquake; Cascadia Subduction Zone; Juan de Fuca Plate; Victoria clays; Data processing; Phanerozoic; Cenozoic; Quaternary
Illustrationssketch maps; tables; bar graphs; plots
ProgramNatural Hazards and Emergency Response
Released2004 12 01
AbstractThis article compares the variation in observed intensity of the 2001 MW 6.8 Nisqually, Washington, earthquake in Victoria, British Columbia (150 km from the epicenter), with amplification hazard predictions based on the average shear-wave velocity of geologic units. Modified Mercalli intensities were assigned from 750 felt reports collected by online Web submission augmented by door-to-door canvassing in regions of particular interest. An intensity map was created based on high-resolution (sub-city block) georeferencing with the Canadian postal code system. Site-specific comparisons of earthquake intensity and geology indicate significant differences in observed felt effects between high and low shear-wave velocity substrates (bedrock and glacial till versus soft clay and peat). Overall, the observed intensity map for weak levels of shaking supports the assignment of amplification hazard based on shear-wave velocities across greater Victoria.

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