JAKARTA, Jan. 22 (Xinhua) -- A shallow undersea quake measuring 6.7 Richter scale struck off East Nusa Tenggara province of central Indonesia on Tuesday, but there was no tsunami alert issued and no initial reports of damages, meteorology and geophysics agency said.

The strong quake is classified as the mainshock of a series of quake striking off the province earlier on Tuesday and the previous 6.2 magnitude quake and two others quake with magnitude of 5.2 are ascribed as fore shocks, official in charge at the agency Priyo Budi told Xinhua over phone.

The jolts of the mainshock were also felt in nearby West Nusa Tenggara province and Bali resort island, the official said.

The mainshock struck at 12:10 p.m. Jakarta time (0510 GMT) with epicenter at 120 km southwest Sumba Barat district of East Nusa Tenggara province and with a depth of 10 km under sea bed, Budi said.

"Our observation on the quake, so far, there is no potential for tsunami from happening," he said.

The intensity of the quake was felt at 3 MMI (Modified Mercally Intensity) in Waingapu town, 3 to 4 MMI in Waikabubak town of the province, 3 to 4 MMI in Lombok Barat district of West Nusa Tenggara province and 2 to 3 MMI in the provincial capital of Mataram as well as 2 MMI in Bali resort island, Budi said.

"However, we have not obtained preliminary reports of damages or casualty triggered by the quake, so far," he said.

For the 6.2 magnitude foreshock, the agency said its jolts were felt strongly at 4 to 5 MMI in Tambolaka town of the East Nusa Tenggara province and 3 MMI in Waingapu town of the province, another official of the agency Aziz Sugiarso told Xinhua earlier. Enditem

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