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Earthquake Ground Motion and 3D Georgia Basin Amplification in Southwest British Columbia: Shallow Blind-Thrust Scenario Earthquakes

2014; Seismological Society of America; Volume: 104; Issue: 1 Linguagem: Inglês

10.1785/0120130116

1943-3573

Sheri Molnar, J. F. Cassidy, K. B. Olsen, Stan E. Dosso, Jun He,

earthquake and tectonic studies

Research Article| January 21, 2014 Earthquake Ground Motion and 3D Georgia Basin Amplification in Southwest British Columbia: Shallow Blind‐Thrust Scenario Earthquakes Sheri Molnar; Sheri Molnar aUniversity of Victoria, School of Earth and Ocean Sciences, 3800 Finnerty Road, Victoria, British Columbia V8P 5C2smolnar@uvic.casdosso@uvic.ca *Also at Natural Resources Canada, P.O. Box 6000, Sidney, British Columbia V8L 4B2; and now at Department of Civil Engineering, University of British Columbia, 6250 Applied Science Lane, Vancouver, British Columbia V6K 1C1; semolnar@mail.ubc.ca. Search for other works by this author on: GSW Google Scholar John F. Cassidy; John F. Cassidy bNatural Resources Canada, P.O. Box 6000, Sidney, British Columbia V8L 4B2jcassidy@nrcan.gc.cajhe@nrcan.gc.ca †Also at School of Earth and Ocean Sciences, University of Victoria, 3800 Finnerty Road, Victoria, British Columbia V8P 5C2. Search for other works by this author on: GSW Google Scholar Kim B. Olsen; Kim B. Olsen cSan Diego State University, Department Geological Sciences, GMCS 231A, 5500 Campanile Dr, San Diego, California 92182‐1020kbolsen@mail.sdsu.edu Search for other works by this author on: GSW Google Scholar Stan E. Dosso; Stan E. Dosso aUniversity of Victoria, School of Earth and Ocean Sciences, 3800 Finnerty Road, Victoria, British Columbia V8P 5C2smolnar@uvic.casdosso@uvic.ca Search for other works by this author on: GSW Google Scholar Jiangheng He Jiangheng He bNatural Resources Canada, P.O. Box 6000, Sidney, British Columbia V8L 4B2jcassidy@nrcan.gc.cajhe@nrcan.gc.ca Search for other works by this author on: GSW Google Scholar Author and Article Information Sheri Molnar *Also at Natural Resources Canada, P.O. Box 6000, Sidney, British Columbia V8L 4B2; and now at Department of Civil Engineering, University of British Columbia, 6250 Applied Science Lane, Vancouver, British Columbia V6K 1C1; semolnar@mail.ubc.ca. aUniversity of Victoria, School of Earth and Ocean Sciences, 3800 Finnerty Road, Victoria, British Columbia V8P 5C2smolnar@uvic.casdosso@uvic.ca John F. Cassidy †Also at School of Earth and Ocean Sciences, University of Victoria, 3800 Finnerty Road, Victoria, British Columbia V8P 5C2. bNatural Resources Canada, P.O. Box 6000, Sidney, British Columbia V8L 4B2jcassidy@nrcan.gc.cajhe@nrcan.gc.ca Kim B. Olsen cSan Diego State University, Department Geological Sciences, GMCS 231A, 5500 Campanile Dr, San Diego, California 92182‐1020kbolsen@mail.sdsu.edu Stan E. Dosso aUniversity of Victoria, School of Earth and Ocean Sciences, 3800 Finnerty Road, Victoria, British Columbia V8P 5C2smolnar@uvic.casdosso@uvic.ca Jiangheng He bNatural Resources Canada, P.O. Box 6000, Sidney, British Columbia V8L 4B2jcassidy@nrcan.gc.cajhe@nrcan.gc.ca Publisher: Seismological Society of America First Online: 14 Jul 2017 Online ISSN: 1943-3573 Print ISSN: 0037-1106 Bulletin of the Seismological Society of America (2014) 104 (1): 321–335. https://doi.org/10.1785/0120130116 Article history First Online: 14 Jul 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Sheri Molnar, John F. Cassidy, Kim B. Olsen, Stan E. Dosso, Jiangheng He; Earthquake Ground Motion and 3D Georgia Basin Amplification in Southwest British Columbia: Shallow Blind‐Thrust Scenario Earthquakes. Bulletin of the Seismological Society of America 2014;; 104 (1): 321–335. doi: https://doi.org/10.1785/0120130116 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of the Seismological Society of America Search Advanced Search Abstract Finite‐difference modeling of 3D long‐period (>2 s) ground motions for large (Mw 6.8) scenario earthquakes is conducted to investigate the effects of the Georgia basin structure on ground shaking in Greater Vancouver, British Columbia, Canada. Scenario earthquakes include shallow blind‐thrust North America (NA) plate earthquakes, simulated in locations congruent with linear clusters of shallow seismicity, that is, potential active faults. A slip distribution model of the Mw 6.7 Northridge, California, blind‐thrust earthquake, with the hypocenter modified to 5 km depth, is used to characterize the source rupture process. Two sets of simulations are performed for a given scenario earthquake using models with and without Georgia basin sediments. The ratio of predicted peak ground velocity (PGV) for the two simulations is applied here as a quantitative measure of amplification due to 3D basin structure. A total of eight shallow blind‐thrust NA plate scenario earthquakes are simulated within 100 km of Greater Vancouver. Overall, predicted ground motions are higher in the down‐dip direction of each epicenter due to the source radiation pattern; hence, scenario earthquakes located south of Vancouver produce the highest motions in the city. The average maximum PGV at stiff soil sites across Greater Vancouver considering all eight scenario earthquakes is 17.8 cm/s (modified Mercalli intensity VII); the average increase in peak motion due to the presence of Georgia basin sediments is a factor of 4.1. The effective duration of moderate‐level (≥3.4 cm/s) shaking within Greater Vancouver is an average of 22 s longer when Georgia basin sediments are included in the 3D structure model.Online Material: Snapshots and videos of wave propagation, and peak ground velocity maps. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.