What else causes tsunamis?
Less frequently, tsunamis can be generated from displacements of water resulting from rock falls, icefalls, and sudden submarine landslides or slumps. Major earthquakes are suspected of causing underwater landslides, which may contribute significantly to tsunami generation. For example, many scientists believe that a major 1998 tsunami along the northern coast of Papua-New Guinea was generated by a large underwater slump of sediments, triggered by an earthquake. The largest tsunami wave ever observed was caused by a rock fall in Lituya Bay, Alaska, on July 9, 1958. Triggered by an earthquake along the Fairweather fault, a massive rock fall at the head of the bay generated a wave that reached the incredible height of 1,720 feet on the opposite side of the inlet. – The International Tsunami Information Center, Honolulu, Hawaii. http://www.prh.noaa.gov/pr/itic/library/about_tsu/faqs.
