The 1960 Valdivia earthquake or Great Chilean earthquake (Spanish: Gran terremoto de Chile/Valdivia) of 22 May 1960 is to date the most powerful earthquake ever recorded, rating 9.5 on the moment magnitude scale. It occurred in the afternoon (19:11 GMT, 14:11 local time) and its resulting tsunami affected southern Chile, Hawaii, Japan, the Philippines, eastern New Zealand, southeast Australia, and the Aleutian Islands in Alaska. Read more
At 3.40pm on 22 May 1960 Valdivia was hit by the strongest recorded earthquake in the world. The Earthquake measured 9.5 on the Richter Scale. Most of the buildings in the city were destroyed by the earth's movements or by the devastating tsunamis that followed. Not only were there catastrophic consequences in the South of Chile, the earthquake caused tsunamis that hit Japan (138 people killed), Hawaii (61 people killed) and the Philippines (32 people killed). At 3.11pm, a smaller earthquake was felt in the region and yet another 'smaller' earthquake of 7.5 the day before in Concepción a little to the north.
Not only was there damage to man-made structures during the quake, but huge landslides, massive flows of earthen debris and rock, were sent down mountain slopes. Some landslides were so enormous they changed the course of major rivers or dammed them up creating new lakes. The land along the coast of Chile, particularly in the Port city of Peurto Montt, subsided as a result of the movement of the ground during the quake and the coastal city was flooded with ocean water.