Under many of the volcanoes' special pages there are "seismicity" tabs giving updated maps, time-depth plots and seismiscity rate plots to help understand the seismic activity at each. There is a weekly update provided by the CVO for Cascade Volcano status. Cascadia is home to numerous active volcanoes that form as a part of the subduction process.

Volcano Hazard Information Map. Click on the volcano icons below to find lots more online resources to inform you about emergency preparedness, volcanic hazards, emergency notification systems, and evacuation plans.

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The following maps show generalized lahar hazards for each of the major volcanoes in Washington. Each map is associated with a report. Check out the Geologic Information Portal (below the table) for detailed hazards near Mount Rainier.

Map boundaries The red polygon is the reporting region for this map; the black polygon is the authoritative region of the PNSN. Events inside the authoritative network are rendered as cirlces; events outside the authoritative region but inside the reporting region are rendered as squares.

Find a volcano near you (volcanoes.usgs.gov/observatories/cvo/) and create a booklet or poster that tells your volcano’s story. See videos describing Mount St. Helens’ past eruptions (volcanoes.usgs.gov/volcanoes/st_helens/st_helens_multimedia_11.html) and explore its story of destruction and recovery (www.mshslc.org/).

Dec 4, 2023 · Most of the major urban areas surrounding the Puget Sound reside on top of these faults. Below is an overview of the crustal faults that pose the most risk to populated areas in Western Washington and significant historical earthquakes.

Does Puget Sound really include three active volcanoes? (Yes! See above.) How far north does the Salish Sea extend? And does that reach as far as Canada’s wonderfully named Octopus Islands? (We would hope so.)

Applying the Geologic Map. The cities of Lyman, Sedro-Woolley, and Burlington are built on terraces composed of lahar-runout deposits from Glacier Peak volcano. Near the town of La Conner and Puget Sound, 135 km down the valley from Glacier Peak, the lahar-runout deposits are 3 to 18 m thick.