Michael Dunne discusses the Cascadia subduction zone's potential for a massive earthquake and tsunami, and a new threat of land subsidence causing flooding. Tina Dura, a Virginia Tech professor and part of the Cascadia Region Earthquake Science Center, explains that the Juan de Fuca plate is subducting beneath the North American plate, causing the land to drop up to six feet during earthquakes. This subsidence, combined with sea level rise, could significantly expand floodplains. Dura emphasizes the importance of preparedness and the challenges of communicating the risks due to Cascadia's seismic quietness. The conversation also touches on the potential for predicting earthquakes and the advancements in early warning systems.