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900 Seattle Fault (7.0 or greater)
Earthquake Hazards Program "Paleoseismic History of the Seattle Fault"

26 January 1700 Cascadia (9.0 or greater)
University of Washington "Geologic and Historic Evidence for 1700 Cascadia Megathrust Earthquake" (photo site)
United States Geological Survey "Holocene Earthquakes in Western Washington"
National Tsunami Hazard Mitigation Project "Recent Research about the Cascadia Subduction Zone Earthquake, January 26, 1700" (website provides an extensive bibliography of materials concerning this seismic event)
Extensive image site containing archival images, diagrams, and recent photography of the 1700 quake from Steven Earle at Malaspina University, British Columbia "The 1700 Juan de Fuca Earthquake"

1872 North Cascade Mountains (6.8-7.5?)(VI)
Map of felt-tremor magnitudes from the Geological Survey of Canada "The Magnitude 7.4 Washington State Earthquake of 1872."
University of Washington Geophysics Program "Earthquake History of Cascadia" (site contains several links to newspaper clippings, technical papers, and isoseismal maps)
University of Washington Geophysics Program "1872 North Cascades Earthquake Washington Reporting Localities" (a compilation of first-hand accounts of the quake)
National Earthquake Information Center "Large Earthquakes in the United States: Near Lake Chelan, Washington 1872"

1946 Seattle (5.7)
Geological Survey of Canada "The Magnitude 7.3 Vancouver Island Earthquake of 1946" (little information, but site has several links to photographs of quake damage)
"Shake, Rattle, and Roll in '46 Earthquake" by Derek Sidenius (commercial article published in Islander Magazine with personal accounts and photographs)

13 April 1949 Olympia (7.1)(VIII)
University of Washington Geophysics Program "Pacific Northwest Earthquake Photos: 1949 Olympia Earthquake"
National Earthquake Information Center "Large Earthquakes in the United States: Puget Sound Area, Washington 1949"

29 April 1965 Seattle-Tacoma (6.5)(VII-VIII)
University of Washington Geophysics Program photographs from "Washington State Earthquake Hazards" figure 35, figure 7, figure 34, figure 32, figure 19

1980 Mount St. Helens - related quakes (4.2-5.1)
United States Geological Survey/Cascades Volcano Observatory "Mount St. Helens, Washington - May 18, 1980 Eruption" (site of links to information about the eruption and other seismic activity related to Mount St. Helens)
University of Washington Geophysics Program "Mount St. Helens Seismicity Information"
Gifford Pinchot National Forest "Mount St. Helens National Volcanic Monument" (great site with several links to information about Mount St. Helens before and after the 1980 event)
United States Geological Survey "Reawakening and Initial Activity" (examination of seismic and volcanic activity on Mount St. Helens prior to the 1980 eruption)

2 May 1996 Duvall (5.3)
University of Washington Geophysics Program "The May 2 Duvall Earthquake (M 5.3)"
United States Geological Survey Earthquake Hazards Program "Duvall Earthquake Aftershock Study"
EQE International "Puget Sound Earthquake Alert: Duvall Earthquake of May 2, 1996" (commercial site dedicated to risk management and mitigation.  Offers fairly extensive summary of the Duvall event).
University of Washington Geophysics Program "Details of the Duvall Earthquake Magnitude" (an update on the Duvall earthquake concerning only calculations of magnitude)

2 July 1999 Aberdeen / 3 July 1999 Satsop (5.5)
EQE International "Western Washington Earthquake of July 2, 1999" (commercial site with good graphics and several photos of Aberdeen event).
University of Washington Geophysics Program "Special Report on the July 3 UTC Magnitude 5.1 Earthquake"
Pacific Northwest Seismograph Network "Special Event" (site of technical information on this event)
National Strong-Motion Program "Satsop, Washington Earthquake" (technical information from NSMP, part of the USGS)

28 February 2001 Nisqually (6.8)
University of Washington Geophysics Program "February 28, 2001 Nisqually Earthquake"
United States Geological Survey Earthquake Hazards Program "Eyewitness Account of Sandboil by USGS Scientist"
United States Geological Survey Geohazards Program "Nisqually Earthquake, Washington Mw 6.8"
University of California Berkley Seismological Laboratory "Magnitude 6.8 Near Seattle, Washington" (site has technical information along with several links)
University of Washington Civil Engineering Program "February 28, 2001 Nisqually Earthquake Information Clearinghouse"
Incorporated Research Institutions for Seismology "Special Event Page" (interesting information on the Nisqually event)
University of California San Diego Anza Group "Recent Quake Near Seattle/Olympia, WA"