The event took place in the Cascadia Subduction Zone, and the thrust ruptured along a 1000 km length stretching from mid Vancouver Island to northern California. The Telcordia GR-63 CORE Seismic Standard is the rating you're looking for. 2 CISCA | Seismic Construction Handbook Seismic Construction Handbook Scope This document is intended to help the reader under-stand the seismic construction requirements for lay-in, suspended ceilings. A seismic hazard zone describes an area with a particular level of hazard due to There are 4 zones, with Zone 1 being the least threatened by seismic activity, and Zone 4 being the most threatened (ie. The map is a simplification of the National Building Code of Canada seismic hazard map for spectral acceleration at a 0.2 second period (5 cycles per second), and shows the ground motions that might damage one- to two-storey buildings. areas near an active fault line). States Seismic th Dakota Bismarck e S Ota st. Paul Des Moines Zones 'son Map c rd Boston ence Seismic Zones (Ground Acceleration) Zone o = o.og Zone 1 = 0.075g Zone 2A = 0.15g Zone 2B = 0.20g Zone 3 = 0.30g Zone 4 = 0.40g Source: 1997 Edition UBC Bóise Rexburg Cheyenn umbus Charl Franhtori ontpeli c any Plains White Harrisburg Washingtón This earthquake, larger than the 1906 San Francisco earthquake, caused nearly a 500-km-long segment of the Queen Charlotte fault to break. This zone produces massive earthquakes, called "megathrust earthquakes," which may register as large as magnitude 9.0 earthquakes. Earthquakes in the northeastern United States. Cascadia Subduction Zone: West of Vancouver Island, and extending from the north tip of the Island to northern California, the oceanic Juan de Fuca plate is moving towards North America at about 2-5 cm/year. The data for 1924-1974 is from the U.S. Geological Survey, and the data for 1975-1999 is from the Weston Observatory archives of earthquakes recorded by the Northeastern United States Seismic Network. The last earthquake in this zone, in 1700, was recorded by First Nations historical accounts and geological records, telling us that it was massive and caused a tsunami that impacted coastlines as far away as Japan. It explains those requirements and demonstrates generally accepted construction methods that comply with these requirements. Although you may hear the terms “seismic zone” and “seismic hazard zone” used interchangeably, they really describe two slightly different things. A seismic zone is used to describe an area where earthquakes tend to focus; for example, the New Madrid Seismic Zone in the Central United States. The Seismic Hazards Mapping Act (SHMA) of 1990 (Public Resources Code, Chapter 7.8, Section 2690-2699.6) directs the Department of Conservation, California Geological Survey to identify and map areas prone to earthquake hazards of liquefaction, earthquake-induced landslides and amplified ground shaking. Telcordia Technologies determines these zones and issues the standards that seismic enclosures must meet. Changes or additions to the seismic provisions come from many different sources, including new research results and documentation of performance in past earthquakes. The seismic hazard map layer indicates the relative seismic hazard across Canada. More info Cascadia Megathrust Earthquake - 9.0 Magnitude One of the world's largest earthquakes took place off the coast of British Columbia in 1700 on Aug. 26 at 9 p.m. These seismic provisions represent the best available guidance on how structures should be designed and constructed to limit seismic risk. 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