A string of earthquakes, the strongest of which registered 6.5 on the Richter scale, jolted the East China Sea yesterday morning, but it is unlikely the tremors will generate a tsunami off the coast of China, said China's Seismological Monitoring Network.

At least four earthquakes occurred in less than two hours, the first striking at 8:26am with a magnitude of 6.3, the network reported.

The other three, with magnitudes of 5.6, 6.5 and 6.0, occurred at 8:31am, 9:46am and 10:23am respectively.

The epicenter, at 25.7 degrees north latitude and 125.1 degrees east longitude, was about 350 kilometers to the east of Taipei and about 450 kilometers from the nearest land on the Chinese mainland, the network said.

No casualties were reported.

"The chances of a tsunami are very slim," said Zhang Yongxian, vice director of the network,. He said the temblors were not powerful enough.