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Summary Subduction zones don't carry passports, and the Cascade Volcanic Arc doesn't stop at the U.S.-Canada border. In this episode, Dr. Jeffrey Zurek (P.Geo) welcomes his mentor Dr. Glyn Williams-Jones (Simon Fraser University) to discuss Canada’s most dangerous volcano: Mount Meager.

We dig into the "detective story" of Meager’s last explosive eruption 2,400 years ago—an event that sent ash to Calgary and created a 110-meter-high volcanic dam. We explore the physics of block and ash flows, the "unzipping" of prehistoric dams leadi ...