This video from the 2011 Tohoku subduction zone earthquake shows the earthquakes before, during, and after the main M8.7 event on March 11 (at 1:50 in the video). The 1949 earthquake near Tacoma triggered a landslide near the Tacoma Narrows that caused a local tsunami. What about the localized tsunami risk? This movement created a tsunami in Puget Sound and triggered a large landslide into Lake Washington. The team also found that accumulated movement on the fault has uplifted old Snoqualmie River sediments to their current position on ridges, in some places several hundreds of feet above the modern Snoqualmie valley floor. In the Puget Sound region, it takes a trained eye to recognize rocky outcrops and subtly raised ground as evidence of a fault. Tsunamis and seiches are destructive waves which can be triggered by certain types of large earthquakes. Make an emergency response plan for you and your family. This is called liquefaction and is discussed in the next section. Maps. Devils Mountain Fault -- Online Professional Paper - USGS In the early 2000s, USGS scientists including Brian Sherrod set out to further Johnsons work and better understand the slumbering fissure. The largest active fault that will affect Washington (and the whole Pacific Northwest) is the Cascadia subduction zone. Keaton and Perry (2006 #7653) excavated two trenches on the south end of the Brightwater treatment plant (KP1 site 572-3, and KP2 site 572-4). Finding and mapping these faults is an important mission of the Washington Geological Survey. HAZARD MAPS As part of the Hazard Mitigation Planning process, mapping of the hazards that have the potential to affect the jurisdiction is performed using geographic information systems (GIS) software. Geologists at the Survey spend time mapping the geology of the state, looking for faults, folds, landslides, and different rock types. Photo courtesy of MOHAI (neg. Also check out Ear to the Ground, published by the Department of Natural Resources. When earthquakes occur on faults that reach the Earths surface, the ground may rupture. Superior Court:(800) 254-2755 In the late 1960s, speculators considered the Puget Sound region a frontier for petroleum exploration. Despite its location well offshore, a Cascadia quake would likely kill at least 10,000 and injure more than 30,000 in Washington, Murphy found. Do you live or work near an area that could have liquefaction?

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