The Indian Ocean tsunami, also known as the south Asian tsunami, occurred on December 26, 2004.Located in the andaman sea. The epicenter was on the ocean floor north of Sumatra, Indonesia. The local seismological bureau measured a magnitude of 6.8 on the Richter scale, while Hong Kong, mainland China and the United States measured a magnitude of 8.5 to 8.7 on the Richter scale. Subsequently, the Hong Kong observatory and the us national earthquake information center revised the magnitude to 8.9 and 9.0 respectively, and the moment magnitude to 9.0.The moment magnitude reached 9.3. Since the earthquake in Chile in 1960 and the 1964 good Friday Alaskan earthquake to the strongest earthquake, but scale since 1900 in the third big earthquake, a tsunami as high as more than 10 meters, spreading as far as the gulf of Oman, east coast of somalia in Africa, and countries such as Mauritius, reunion, cause huge casualties and property losses.