A magnitude-7.7 earthquake hit off the coast of Indonesia in the eastern Flores region, the United States Geological Survey reported on Friday.

The epicenter was 68 kms (42 miles) north-northwest of the city of Ende in East Nusa Tenggara province.

The quake was felt across much of Flores island. Initial reports indicated there was damage to homes and public facilities, though officials had not yet released estimates of the number of damaged buildings or any casualties.

Indonesia’s Meteorology, Climatology and Geophysics Agency issued a tsunami warning and urged residents to stay away from beaches and riverbanks. The agency located the shallow undersea quake near Flores island.

Residents along affected coastlines were advised to move to higher ground as officials are closely monitoring coastal tide gauges for any changes.

The initial quake was followed by two aftershocks.

Yohanna Embu, a resident of Sikka, a regency within East Nusa Tenggara province, said a number of buildings were damaged by the strong shaking and panicked people ran to higher ground.

“Many buildings here were damaged … I saw that the waiting room at the Pelni port terminal in Maumere had collapsed,” she said.

Separately, Australia’s tsunami warning center said the undersea earthquake will have “no tsunami threat to the Australian mainland, islands or territories”.

Indonesia, a vast archipelago of more than 17,000 islands, is prone to earthquakes and volcanic activity because of its location on the “Ring of Fire,” an arc of volcanoes and fault lines in the Pacific Basin.

In December of 1992, a magnitude 7 earthquake caused a tsunami that killed about 2,500 people on the southeastern island of Flores, part of a group of islands in the eastern half of Indonesia.

The latest quake comes after a 7.4-magnitude earthquake rocked western Colombia on Monday, causing widespread damage.

In June, deadly back-to-back earthquakes, with magnitudes of 7.2 and 7.5, killed more than 6,000 people in Venezuela, according to government figures.