A strong 6.1-magnitude earthquake struck off the Indonesian coast early Tuesday, but no tsunami warning was issued and there were no immediate reports of damage.

The quake hit at a depth of 31 kilometres (19 miles) off Sumba island, some 150 kilometres west southwest of the city of Waingapu, according to the United States Geological Survey.

It was followed by a weaker quake in the same area with an initial reading of 5.2 magnitude, according to Indonesia's disaster agency.

There were no immediate reports of damage or casualties.

Indonesia is still reeling from a deadly tsunami at the end of December triggered by an erupting volcano in the middle of the Sunda Strait between Java and Sumatra islands that killed more than 400 people.

The vast Southeast Asian archipelago is one of the most disaster-hit nations on Earth due to its position straddling the so-called Pacific Ring of Fire, where tectonic plates collide.

The tsunami was Indonesia's third major natural disaster in six months, following a series of powerful earthquakes on the island of Lombok in July and August and a quake-tsunami in September that killed around 2,200 people in Palu on Sulawesi island, with thousands more missing and presumed dead.

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Waiting for the complete rupture in Nepal
Zurich, Switzerland (SPX) Jan 18, 2019
In April 2015, Nepal - and especially the region around the capital city, Kathmandu - was struck by a powerful tremor. An earthquake with a magnitude of 7.8 destroyed entire villages, traffic routes and cultural monuments, with a death toll of some 9,000. However, the country may still face the threat of much stronger earthquakes with a magnitude of 8 or more. This is the conclusion reached by a group of earth scientists from ETH Zurich based on a new model of the collision zone between the Indian ... read more