BEIJING, Feb. 4 -- A 6.4-magnitude earthquake jolted waters near Hualien County in northeast Taiwan at 9:56 p.m. Sunday (Beijing Time), according to the China Earthquake Networks Center (CENC).

The epicenter was monitored at 24.2 degrees north latitude and 121.72 degrees east longitude, with a depth of 10 km, the center said in a renewed statement. A 5.6-magnitude quake had been reported by the center.

A 5.5-magnitude aftershock was reported at 10:13 p.m. in the same region, the center said in another statement.

The center earlier said that a 4.7-magnitude earthquake was monitored at 9:12 p.m. in the same region.

Taiwan's meteorological authority said that a series of earthquakes hit Hualien, with the strongest measured 5.8.

The first quake took place at 9:12 p.m. and was followed by at least six aftershocks.

Local residents in Hualien said they had felt the quakes clearly at home. Local media reported that the quakes affected four trains.

No casualties have been reported.