RCPGP Hub - Home

Puget Sound RCPGP Hub Discover data, forms, tools, other resources for regional partners Puget Sound Regional Catastrophic Grant Program (2019-2022) Snohomish County received a Regional Catastrophic Grant in 2019 as part of a 3 year grant program. The County is leading a Regional effort of 8 Counties and 7 cities, in collaboration with the State of Washington Emergency Management Division, FEMA Region 10, and various public and private industry partners to assess transportation damage after a 9.0 magnitude Cascadia Subduction Zone quake and determine the population impacts of such an event. This site is under construction and will be actively updated as the project develops. USGS Cascadia Subduction Zone The 2019 RCPGP Project will analyze the results of a simulated 9.0 magnitude rupture of the Cascadia Subduction Zone across an 8 County Puget Sound region, and its impacts on the transportation system, the supply chain of goods and supplies, and population mobility. The results of this analysis will feed decisions on where to provide viable Community Points of Distribution, or CPODs, throughout the 8 County Region, where life sustaining goods and supplies will be distributed after a major seismic event. The analysis will also include estimates of which areas of population may remain isolated longer than others, and where long term CPOD operations may be needed. Additionally, the project will bring together public and private maritime industry members to discuss how the region's waterways can be utilized to ship large goods and supplies to distribution hubs where they can serve the CPODs. The Cascadia Subduction Zone (CSZ) is a 700 mile subduction zone that generally runs N-S off of the North American West Coast from Cape Mendocino, CA to Brooks Peninsula, BC, where the Juan de Fuca and Gorda oceanic plates converge with the North America continental plate at an approximate 20 mile depth. A rupture of this fault could create a significant seismic event, historically between 8.0 - 9.0 magnitude on the seismic scale. The last rupture of the CSZ occurred in the year 1700, and was estimated by geologists to have been between a magnitude 8.7 and 9.0 in scale, along 620 miles of fault line. The average upward thrust of that event was 66 feet, which created a major seismic disturbance across the region, including tsunamis linked to the event on the Washington coast and in Japan. The entire fault could rupture as one large event, or rupture section by section over a period of years. Coastline displacement of up to 6.6 feet in elevation could occur, possibly triggering tsunamis in multiple locations along the Pacific Ocean coastlines. Additional damage could occur based on the shaking intensity, especially in areas with soils prone to liquefaction or landslides. Intense shaking at this magnitude is expected to cause major infrastructure damage to buildings, highways, railways and bridges, which could create 'Population Islands" where mobility outside of the immediate area may be significantly limited, or not possible, delaying or inhibiting a return trip for many people to their homes and reunification with loved ones. The RCPGP project will analyze the infrastructure impacts of a M9.0 CSZ event, and assess where these Population Islands may occur, and the viability of selected CPOD sites to serve each population island. The project will also assess the capacity of the CPOD sites, and determine based on prioritized transportation routes, where CPODs may be needed on a longer term basis. Subduction zones occur where tectonic plates converge, when one or more plates slides beneath another plate, subducting into the Earth's mantle. Subduction Zone plates may become stuck at shallow depths, building up and storing stress along the fault line. When this pressure breaks free, the fault slips, releasing the energy in a megathrust event, producing some of the largest earthquakes on Earth. These large seismic events can also create tsunamis when the seafloor moves vertically, or drops, displacing a massive amount of water. The Washington State Department of Natural Resources has produced a Tsunami Simulation of a 9.0 rupture of the Cascadia Subduction Zone available on You Tube. Other tsunami resources and information can be found on their Tsunami webpage - https://www.dnr.wa.gov/programs-and-services/geology/geologic-hazards/Tsunamis

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