25 seconds into the video there is an earthquake! The video depicts call traffic in Rwanda on the day of the Lake Kivu earthquake, February 3, 2008. Data obtained from network traffic logs, and is aggregated every minute for every tower. Red (blue) cells correspond to a large (small) number of incoming calls. The earthquake occurs at roughly 9:30am, about 25 seconds into the video. For more information, contact Joshua Blumenstock at UC Berkeley.