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Businesses in Cascadia - CREW

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The February 2011 earthquake <strong>in</strong> Christchurch was a magnitude 6.1 event and occurred rightunder the city’s downtown. Although the magnitude of this earthquake was smaller than that ofthe Nisqually earthquake <strong>in</strong> 2001, the earthquake <strong>in</strong> Christchurch was shallow where theNisqually earthquake was deep. This means that the <strong>in</strong>tensity of the ground shak<strong>in</strong>g was greaterat Christchurch and the level of damage was correspond<strong>in</strong>gly more significant. In Christchurch,they had to cordon off the downtown so that all the damaged build<strong>in</strong>gs with<strong>in</strong> this “Red Zone”could be safely cleaned up. The cordoned area is smaller now than when they started, but eightblocks were still cordoned off as of March 2012. The orig<strong>in</strong>al zone covered one square mile.Among other lessons, the experience of Christchurch shows how important it is for bus<strong>in</strong>esses toth<strong>in</strong>k about what would happen if they were not able to get back <strong>in</strong>to their build<strong>in</strong>gs after anearthquake. This event illustrates the importance of hav<strong>in</strong>g cont<strong>in</strong>gency plans <strong>in</strong> place beforehand.<strong>CREW</strong> seeks to help bus<strong>in</strong>esses engage <strong>in</strong> this type of plann<strong>in</strong>g and preparation.Presentation: Key Earthquake Scenarios for Puget SoundTIM WALSHTim Walsh, Chief Hazards Geologist at the Wash<strong>in</strong>gton State Department of Natural Resources,outl<strong>in</strong>ed Wash<strong>in</strong>gton’s three critical earthquake sources:• Subduction zone earthquakes• Deep (Benioff zone) earthquakes• Shallow (crustal) earthquakesHe then described four earthquake scenarios with significant impacts for western Wash<strong>in</strong>gtonand expla<strong>in</strong>ed how geologists first discovered these fault zones and assessed their potential forgenerat<strong>in</strong>g future earthquakes.• <strong>Cascadia</strong> subduction zone: M9.0 scenario• Southern Whidbey Island fault (SWIF): M7.4 scenario• Seattle fault: M7.2 scenario• Tacoma fault: M7.1 scenarioHazard maps for these scenarios can be found at http://earthquake.usgs.gov/hazards/products/scenario/<strong>CREW</strong> has developed and published earthquake descriptions and scenarios for the <strong>Cascadia</strong>subduction zone, shallow earthquakes, and deep earthquakes: http://crew.org/products-programs(Pr<strong>in</strong>ted copies were distributed to the participants along with USB thumb drives conta<strong>in</strong><strong>in</strong>g allof <strong>CREW</strong>’s publications.)Seattle, Wash<strong>in</strong>gton | 23

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