On 16 March 2021, the Teach311 + COVID-19 Collective (www.teach311.org) hosted a virtual roundtable discussion entitled “Sources of Disaster: New Epistemic Perspectives in Post-3.11 Japan.” The event brought together scholars and students researching the history and anthropology of Japan to explore how the earthquake, tsunami, and nuclear power plant disaster of 11 March 2011 (3.11) changed our ways of knowing the world. The roundtable focused on the idea of the “source” to get at these epistemic shifts in lived experience and practical knowledge as well as historiography, and to investigate ideas that range from what we can know about acceptable risk and safety to notions of home and belonging.