Two simultaneous earthquakes measuring 5.9 and 6 hit Sumba Island in southern Indonesia,  with a population of 750 thousand people, on Tuesday morning, October 2, 2018, according to the US Geological Survey (USGS).

About 15 minutes after the first quake, a second earthquake measuring 6 degrees hit the same area, according to USGS, which identified the epicenter at a depth of 30 kilometers.

Last week’s earthquake and tsunami that killed at least 844 people and displaced about 59 thousand others, according to official figures, triggered a disaster that prompted the Indonesian government to seek international help.

Authorities expect the death toll to rise as rescuers are having difficulties reaching remote areas.

Indonesia has seen a series of devastating earthquakes in recent years, being in the infamous “Ring of Fire”, and a home for 452 volcanoes sitting on a volcanic belt with tremendous tectonic plate movements.