BEIJING - China's international communication connections have mostly resumed after a massive 9.0-magnitude earthquake jolted Japan, damaging undersea cables, the country's telecommunications operators said Monday.

China Telecom, China's largest fixed-line telecommunications service provider by user number, said by Monday, the company had restored 65 gigabytes of outbound circuits which were out of order after the devastating quake took place Friday afternoon.

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The company previously said the quake had damaged submarine cables in Japanese waters near the Ibaraki Prefecture, causing disruption in its 105 gigabytes of internet circuits and 7 gigabytes of privately leased circuits, which led to a speed drop when accessing to North American websites.

China Unicom, the country's second-largest mobile operator after China Mobile, said that, except for a connection to the network of Japan's NTT Communications (NTT Com), most circuits had been repaired and are operating at pre-quake levels.

A spokesman with the China Mobile said Monday that despite a surge in number of calls to Japan, most of the company's services are operating in a normal condition.

A massive 9.0-magnitude earthquake and ensuing tsunami hit Japan last Friday, causing widespread destruction.