People gather on a street after a tremor was felt in Mexico City, capital of Mexico, on Feb. 16, 2018. A 7.1-magnitude earthquake hit Mexico at 7:39 a.m. Saturday (Beijing Time), according to the China Earthquake Networks Center (CENC). (Xinhua/Francisco Canedo)

MEXICO CITY, Feb. 16 (Xinhua) -- A powerful earthquake has shaken southern Mexico on Friday afternoon as people fled out of buildings in capital Mexico City when the ground was shaking.

According to the U.S. Geological Survey, the earthquake was measured 7.5 on the Richter scale 4 kms south of Pinotepa de Don Luis with the epicenter at a depth of 10 kms.

Strong tremors were felt in Mexico City and quake alarms were triggered in the city.

In a major street near the capital's Chinatown, the traffic was temporarily halted as crowds of people are gathering outside, checking updates about the earthquake through cellphones.