Following the explosions of August 4, 2020 in Beirut (Lebanon), researchers from the PACTE, LIG and ISTERRE laboratories of CDP RISK-University Grenoble Alpes and Lebanese researchers gathered within the Lebanese French-Lebanese Environmental Observatory O-Life, have worked together to launch an online survey among the people who felt the explosions in the port of the Lebanese capital. This study aims at better understanding the behaviors, movements and mobility of people during disasters. Responses are anonymous and contribute to a statistical analysis.