A 6.6-magnitude earthquake jolted a juncture region of two counties in Northwest China's Gansu Province Monday morning.

The earthquake occurred at 7:45 am at the junction of the Minxian county and Zhangxian county, according to the China Earthquake Networks Center.

The local people in the Minxian county said strong tremor was felt and they saw noticeable shake of trees and homes, adding that the quake lasted for about one minute.

Meanwhile, the earthquake was also felt in neighboring cities of Dingxi, Longnan, Tianshui, as well as the provincial capital city of Lanzhou.

Xi'an, capital of the neighboring Shaanxi Province was also reported to have felt the quake.

Causalities are still unknown. Xinhua reporters are rushing to the quake-stricken area.

The epicenter, with a depth of 20 kilometers, was monitored at 34.5 degrees north latitude and 104.2 degrees east longitude, said the center.