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Huge 7.7 significance quake moves off Indonesia simply hours after fatal quake.

An earthquake measuring 7.7 magnitude struck off the coast of Sulawesi island, Indonesia, on Friday, according to the US Geological Survey, just hours after a fatal quake in the region.

Officials asked people in affected area to remain on the alert as a number of moderate aftershocks hit the area, and warned of more damage.

The U.S. Geological Survey put the magnitude of the second quake at a strong 7.5, after first saying it was 7.7.

The earlier quake destroyed some houses, killing one person and injuring at least 10, authorities said.

“The (second) quake was felt very strongly, we expects more damage and more victims,” Nugroho said.

A series of earthquakes in July and August killed nearly 500 people on the holiday island of Lombok, hundreds of kilometers southwest of Sulawesi.

Indonesia sits on the Pacific Ring of Fire and is regularly hit by earthquakes.

In 2004, a big earthquake off the northern Indonesian island of Sumatra triggered a tsunami across the Indian Ocean, killing 226,000 people in 13 countries, including more than 120,000 in Indonesia.