Communication is a primary challenge in response to natural and man-made disasters. The purpose of this study is to determine the forms of communications that played a critical role in disaster preparedness during the 2011 Great East Japan earthquake and tsunami (Tohoku earthquake). The study used a case study research method and included six informants following the purposive sampling technique. Data was collected through unstructured in-depth interviews. The findings suggest that communicationin all forms played a vital role in disaster preparedness. In the survivor’s view, however, the impact of broadcast media in establishing situational awareness was limited. Local disaster management efforts, such as, “on call,” or emergency measures, such as, personnel and trucks with communication systems, mobile phone alarms, and sirens were viewed by survivors as useful in transmitting unambiguous, specific messages in a demanding tsunami context. In particular, the study demonstrates that residents’ trust in risk/disaster related messages and mediums play vitalroles in subsequent behaviour/response to natural disasters.