To help BCLC members communicate the extent of the earthquake that struck Japan in March 2011 we designed an interactive map that allows users to mouse over individual seismic events and instantly view the timing and magnitude of each event. We focused on the first 24 hours following the earthquake, visualizing the original 9.0 earthquake, subsequent aftershocks, and the range and severity of ground movement. The full interactive map can be embedded into any website, much like a YouTube video, and was designed using TileMill and open data from the U.S. Geological Survey.