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At 10:5 on the night of July 7, 1958 a massive tsunami took place in South West Alaska. This tsunami was triggered by a strong earth quake; which caused a rock slide to fall into a narrow bay.

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The earth quake was a magnitude 7.8 and occurred along the active Fairweather fault, which is between the Pacific and the North American plates. The earthquake triggered a large landslide and caused 90 million tons of rock to fall 900 metres into the bay waters. Resulting in a mega tsunami.

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The Tsunami was caused by a landslide and resulted in a wave 1,720 foot tall (524m). The height of the wave is easily measurable by the forest devastation and trim lines it caused. This tsunami is referred to as a mega-tsunami because of its size.

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The lighter areas on the sides of the bay show where trees were stripped away.

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Earthquake Intensity Map

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There have been patterns noticed as this earthquake, landslide and tsunami chain reaction has occurred before. From tree cores, geologists have gather that this devastating chain happens as a cycle approximately every 26 years; and is currently overdue for one. The best way to prevent loss of life is to place sensors on the Fairweather fault to try and formulate a warning system with dangerous times to be in the bay. This may prove difficult as false warnings may be often signalled at this active fault. Seismometers would be the best method for detecting plate movement.

Ensuring that individuals are not allowed to build near the bay in the areas that have been previously struck, is another way to prevent loss of life.

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The bay is located 250 miles west of Juneau in the Gulp of Alaska, called Lituya Bay. The bay is only 14 Km long and 3 Km wide, and has a T shape configuration. The bay's small length does confuse

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Only Five people lost their lives by anchoring in the bay that night. Three boats were carried off and destroyed by the wave.

A man and his son survived the wave, as their boat was merely carried and swept back into the bay. His anchor line was snapped and him and his son were then moved by the mass of water. The man recounts sitting in his boat above the treeline on the top of the wave preparing for his demise. They both lived to tell their story.

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This picture displays a height comparison of the wave to commonly known skyscrapers.

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The initial wave that hit the treeline at the massive height was only one of the waves that swept across the bay. From damages it appears that the following wave that went the full length of the bay and was only about 100 metres tall, from trim lines observed.

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Ariel view of the bays edges. Rock face through the tsunamis path, no trees remained.

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The disaster took only a few minutes to cause devastation. The earthquake, landslide and damages from the tsunami had all taken place consecutively.

The damage that was caused had a large environmental effect, without an infrastructure component. Full forested sections became completely uprooted, across all areas the tsunami wave had reached. There were no structures among the devastated forests that were disrupted by this disaster.  The only cost was the regrowth period of the forest

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(n.d.). Retrieved December 06, 2017, from http://www.geological-digressions.com/?p=1141

(n.d.). Retrieved December 06, 2017, from http://geology.com/records/biggest-tsunami.shtml

(n.d.). Retrieved December 06, 2017, from https://blogs.agu.org/landslideblog/2008/07/09/lituya-bay-50-years-on/