Researchers plot course of ancient American tsunami Researchers have calculated the scale of a giant wave that devastated the north west coast of America 1,100 years ago. Japanese scientists used computer modelling to recreate the devastation from the ancient tsunami. The team from the Disaster Reduction and Human Renovation Institution in Kobe say the work will help planners minimise the impact of any future wave. The researchers took clues from silt deposits found in the Puget Sound, a Pacific inlet above earthquake fault lines in the Seattle area. Experts say the tsunami could have reached up to seven metres in...