At 10 pm on July 9th (1958) there was a magnitude 8.0 earthquake along the Fairweather Fault. The earthquake loosened 40 million cubic yards (30.6 million cubic meters) of rock. The rock mass fell 3000 feet (914 meters) into the water below. This massive displacement of water formed the largest recorded tsunami which swept across the bay. The resulting "gravity wave" was 1720 feet (524 meters) above sea level. Millions of trees, vegetation, and soil were washed away leaving bare rock surfaces behind. The wave was estimated to move at a speed of 100 mph (161 kph).    Read more »