The 2004 tsunami was caused by a under water earthquake. by Zak. This under water earthquake read as a devastating 9 on the Richter scale.
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this resulted in a tsunami that hit coastal areas of Indian Ocean on December 26, 2004. A team of Canadian engineers conducted a reconnaissance in Thailand and Indonesia. Their findings are presented in the paper in terms of performance of buildings, bridges, coastal structures and other physical infrastructure. It was observed that non-engineered reinforced concrete structures, low-rise timber frames and un-reinforced masonry buildings suffered extensive damage.

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an earth quake is caused when 2 tectonic plates get stuck together. this causes pressure.
when the pressure is released it causes an earthquake if this happens in the sea it causes an tsunami.

A report by the teem read;
"A subduction earthquake, with a Richter magnitude of 9.3, occurred on December 26, 2004, off the
coast of the Indonesian island of Sumatra, at 7:59 a.m. local time. Extensive seismic damage to
engineering infrastructure occurred in northern and north-western Sumatra. A devastating tsunami was
generated with wave heights exceeding 20 m, inflicting widespread destruction in Indonesia, Malaysia,
Myanmar, Thailand, Bangladesh, Sri Lanka, India and 12 other countries around the Indian Ocean. The
effects of tsunami were felt as far away as Somalia, Tanzania and Kenya along the east coast of Africa.
The casualties were in excess of 310,000. Millions of people were affected, many losing their homes and
suffering from tremendous grief. The economic impact on the countries surrounding the Indian Ocean
was very significant".
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