A tsunami is a series of ocean waves typically caused by seismic events, with the term originating from the Japanese for 'harbor wave.' Tsunamis can reach heights over 1000 feet and can travel at speeds of up to 60 miles per hour, causing significant destruction to coastal areas, including loss of life and environmental impacts. Response efforts, such as those by Islamic Relief and local governments, have focused on providing immediate aid, rebuilding homes, and supporting affected communities.