Magnitude	7.9
Date-Time	Monday, May 12, 2008 at 06:28:00 UTC Monday, May 12, 2008 at 02:28:00 PM at epicenter
Location	31.021°N, 103.367°E
Depth	10 km (6.2 miles) set by location program
Region	EASTERN SICHUAN, CHINA
Distances	80 km (50 miles) WNW of Chengdu, Sichuan, China 140 km (90 miles) WSW of Mianyang, Sichuan, China 345 km (215 miles) WNW of Chongqing, Chongqing, China 1545 km (950 miles) SW of BEIJING, Beijing, China
Location Uncertainty	horizontal +/- 4.9 km (3.0 miles); depth fixed by location program
Parameters	NST=233, Nph=233, Dmin=592.2 km, Rmss=1.24 sec, Gp= 25°, M-type=moment magnitude (Mw), Version=A
Source	USGS NEIC (WDCS-D)
Event ID	us2008ryan

The following is a release by the United States Geological Survey, National Earthquake Information Center: An earthquake occurred 90 km (55 miles) WNW of Chengdu, Sichuan, China and 1545 km (960 miles) SW of BEIJING, Beijing, China at 12:28 AM MDT, May 12, 2008 (2:28 PM local time in China). The magnitude and location may be revised when additional data and further analysis results are available.

At least 19,500 people killed and severe damage in the Dujiangyan-Mianzhu-Mianyang area. Landslides blocked roads and buried buildings in the Beichuan-Wenchuan area. Felt (VII) at Chengdu, (VI) at Xi'an and (V) at Chongqing and Lanzhou. Felt in much of central, eastern and southern China, including Beijing, Guangzhou, Nanjing, Shanghai, Tianjin, Wuhan and in Hong Kong. Also felt in parts of Bangladesh, Taiwan, Thailand and Vietnam.

The Sichuan earthquake of May 12, 2008, occurred as the result of motion on a northeast striking reverse fault or thrust fault on the northwestern margin of the Sichuan Basin. The earthquake's epicenter and focal-mechanism are consistent with it having occurred as the result of movement on the Longmenshan fault or a tectonically related fault. The earthquake reflects tectonic stresses resulting from the convergence of crustal material slowly moving from the high Tibetan Plateau, to the west, against strong crust underlying the Sichuan Basin and southeastern China.

On a continental scale, the seismicity of central and eastern Asia is a result of northward convergence of the India plate against the Eurasia plate with a velocity of about 50 mm/y. The convergence of the two plates is broadly accommodated by the uplift of the Asian highlands and by the motion of crustal material to the east away from the uplifted Tibetan Plateau.

The northwestern margin of the Sichuan Basin has previously experienced destructive earthquakes. The magnitude 7.5 earthquake of August 25, 1933, killed more than 9,300 people.