Earthquake of magnitude 5.9 strikes Indonesia's Sumbawa region

What happened

A magnitude 5.9 earthquake has struck the Sumbawa region in southern Indonesia, shaking the Lesser Sunda Islands and triggering anxiety among local communities.

The earthquake was registered by the German Research Centre for Geosciences (GFZ), which monitors global seismic activity. The tremor struck a region known for its complex network of active faults, situated in the southern band of the Indonesian archipelago.

Assessing the damage

There have been no immediate reports of casualties or significant structural damage.

Local disaster management officials in West Nusa Tenggara province, which administers Sumbawa, are conducting initial assessments across the island. In Sumbawa’s coastal communities and mountainous interior, earthquakes of this size routinely cause brief panic, prompting residents to run outdoors. However, because much of the island's interior is rugged and sparsely populated, the impact of mid-range tremors is often less severe than if they occurred near densely packed urban centres.

National disaster agencies have not issued a tsunami warning, and sea levels along Sumbawa’s coastline have remained normal. Typically, earthquakes under magnitude 6.5 do not generate the massive displacement of water needed to trigger a tsunami, though local authorities still advise residents to remain vigilant.

Differing reports on the epicentre

While GFZ located the epicentre near Sumbawa, other international seismic trackers registered the shaking slightly further southeast. Volcano Discovery reported a magnitude 6.1 earthquake hitting approximately 38 kilometres southwest of Tambolaka, a town on the neighbouring island of Sumba, during the early morning hours.

Such discrepancies are common in the immediate aftermath of a seismic event. Different global agencies rely on distinct networks of seismographs, leading to minor variations in estimated magnitude, depth, and epicentre location before the scientific data is fully reconciled.

A history of seismic activity

Indonesia sits squarely on the Pacific "Ring of Fire", an arc of intense seismic and volcanic activity where the Indo-Australian plate collides with the Eurasian plate. The country experiences thousands of earthquakes every year, though the vast majority are too deep or too small to be felt.

The region surrounding Sumbawa has a long history of destructive seismic events. In 2018, neighbouring Lombok was devastated by a sequence of powerful shallow earthquakes that killed over 500 people, displaced hundreds of thousands, and flattened entire villages.