USGS公布的青海地震震级是6.9

http://earthquake.usgs.gov/earthquakes/eqinthenews/2010/us2010vacp/

大家自己解读这6.9和7.1背后的故事吧。

Earthquake Details

Magnitude	6.9
Date-Time	Tuesday, April 13, 2010 at 23:49:38 UTC Wednesday, April 14, 2010 at 07:49:38 AM at epicenter Time of Earthquake in other Time Zones
Location	33.224°N, 96.666°E
Depth	17 km (10.6 miles) set by location program
Region	SOUTHERN QINGHAI, CHINA
Distances	235 km (145 miles) NNW of Qamdo, Xizang (Tibet) 385 km (240 miles) SSE of Golmud, Qinghai, China 525 km (325 miles) SSE of Da Qaidam, Qinghai, China 1905 km (1190 miles) WSW of BEIJING, Beijing, China
Location Uncertainty	horizontal +/- 6.4 km (4.0 miles); depth fixed by location program
Parameters	NST= 83, Nph= 83, Dmin=654.3 km, Rmss=1.12 sec, Gp= 32°, M-type=centroid moment magnitude (Mw), Version=9
Source	USGS NEIC (WDCS-D)
Event ID	us2010vacp