Abstract
A large tsunami attacked Tutuila Island, American Samoa in the early morning on 29 September 2009 (local time), and killed 35 people. We must draw attention to be low death ratio compared with past tsunami disasters, while local people did not get tsunami warning information before tsunami coming and did not have tsunami knowledge. We carried out the field investigation on evacuation behavior of residents in Tutuila Island. The main findings are as follows: first, most residents evacuated some high ground areas close to their residential area. Secondly, almost all people evacuated on foot. Third, residents built social reality "We are dangerous when we are here". The reality was built by some people's behavior, e.g., mayor's call, residents' call, sounding the church bell and so on.
