EarthquakeinChina 中国地震 .ppt

Earthquake in China Earthquake science research in China is with the history of more than 4000 years. The earthquake in Qishan mountain in Shanxi province occurred Zhou Dynasty in 780 years BC was the earliest earthquake recorded in Chinese history. The earthquake happened in Ming Dynasty in 1556 in the Guanzhong area of Shaanxi province is the deadliest earthquake in Chinese history. The total number of victims was high up to 830,000 , which is the world s deadliest earthquake known currently. According to the records, Chinas largest earthquake is the Chayu earthquake in Tibet in August 5,1950. The magnitude of the earthquake is 8.6, affecting area of about 24,000 square kilometers, including areas with serious destruction more than 20 square kilometers. * China accounts for 7% of the worlds land but the 33% of the strong earthquake in the mainland, which is most welcome country by the earthquake. China is also the country with the most serious earthquake disasters. Of course, the more accurate view is that China and Japan are the countries with the most serious earthquake disasters. As shown on the above, that is the presentation of where the earthquake happened in China the last month. We can know from it that the earthquake is frequent in China. However, why have we not recognize the frequent earthquake in China? Earthquake frequency is high in western China while the effect of earthquakes is large in the east because the earthquake usually occurred in the deserted mountains in western China while in cities in the east. In 2001, there was a earthquake -- East Kunlun earthquake with the magnitude of 8.1. which is more powerful than that in Wenchuan in 2008. The earthquake are not well known due to no human habitation in the Tibet area. This is the earthquake in western Kunlun in 2001. Notes:UERDI(地震风险度指数 ) There are lots of cities in China facing the danger of the earthquake. This also show us that the earthquake in China is frequent. *