YUSHU - A 5.7-magnitude aftershock jolted Yushu Tibet Autonomous Prefecture in northwest China's Qinghai Province at about 10:29 a.m. Saturday, according to the China Earthquake Networks.
The aftershock's epicenter was monitored at 96.3 degrees east longitude and 33.3 degrees north latitude in Longbao Town, 60 km southwest of Gyegu Town. But it was strongly felt in Gyegu, the prefecture seat of Yushu, Xu Chuanjie, head of emergence rescue section of the provincial earthquake bureau said.
The quake focus was 10 km below the earth's surface.
The tremor was followed by three other aftershocks, which measured 3.2, 3.8 and 4.1 on the Richter scale, respectively.
The three aftershocks' epicenter was almost the same - 96.2 degree east longitude and 33.3 degree north latitude.
No casualties have been reported.
A 7.1-magnitude quake struck Yushu April 14, killing more than 2,200 people.
From April 14 to May 27, Yushu recorded 1,868 aftershocks, of which 15 were above 3 magnitude.