5. 12 Wenchuan earthquake occurred on Monday, May 1 Sunday (UTC+8) 14:28:04. According to the data of People's Republic of China (PRC) and State Seismological Bureau, the magnitude of seismic surface wave is 8.0Ms on the Richter scale and 8.3Mw in an instant (the earthquake magnitude is 8.3 MW).
As the Indian Ocean plate moves northward at a speed of about 15cm per year, the Eurasian plate is compressed and the Qinghai-Tibet Plateau rises rapidly. In addition, due to the influence of gravity, the eastern side of the Qinghai-Tibet Plateau is gradually sinking along the Longmen Mountain, and it is facing the tenacious resistance of the Sichuan Basin, leading to the long-term accumulation of tectonic stress energy.
Finally, the pressure was suddenly released from Beichuan to Yingxiu in Longmen Mountain. It caused thrust, dextral and compressional fault earthquakes.
Extended data:
Since the Wenchuan earthquake in May 12, the international community has expressed sincere sympathy and condolences to the government and people of China and provided various forms of support and assistance. As of July 8, 2008, the Ministry of Foreign Affairs and Chinese embassies and consulates abroad had received donations of RMB 17 1 1 billion from foreign governments, organizations and individuals.
Among them, foreign governments and international and regional organizations donated 770 million yuan; Foreign diplomatic institutions and personnel in China donated 6.5438 yuan +0.9925 million yuan; Foreign NGOs, enterprises, people from all walks of life, overseas Chinese, overseas students and Chinese-funded institutions donated 939 million yuan.
References:
5. 12 Wenchuan earthquake-Baidu Encyclopedia