| Title | Comparing intensity variation of the 2001 Nisqually earthquake with geology in Victoria, British Columbia
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| Author | Molnar, S; Cassidy, J F ; Dosso, S E |
| Source | Bulletin of the Seismological Society of America vol. 94, no. 6, 2004 p. 2229-2238, https://doi.org/10.1785/0120030236 |
| Year | 2004 |
| Alt Series | Geological Survey of Canada, Contribution Series 2004040 |
| Publisher | Seismological Society of America (SSA) |
| Document | serial |
| Lang. | English |
| Media | paper; on-line; digital |
| File format | pdf |
| Province | British Columbia |
| NTS | 92B/05; 92B/06; 92B/11; 92B/12 |
| Area | Greater Victoria; James Bay; Colwood Delta; Washington State; Olympia; Canada; United States of America |
| Lat/Long WENS | -124.0000 -123.0000 48.7500 48.2500 |
| Subjects | geophysics; 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 |
| Illustrations | sketch maps; tables; bar graphs; plots |
| Program | Natural Hazards and Emergency Response |
| Released | 2004 12 01 |
| Abstract | This 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. |
| GEOSCAN ID | 215521 |
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