7.7-Magnitude Earthquake Strikes Indonesia’s Flores Island, Triggers Tsunami Warning and Mass Evacuations

7.7-Magnitude Earthquake Strikes Indonesia’s Flores Island, Triggers Tsunami Warning and Mass Evacuations

7.7-Magnitude Earthquake Hits Indonesia’s Flores Island, Tsunami Warning Issued

powerful 7.7-magnitude earthquake struck off Flores Island in Indonesia, triggering a tsunami warning, mass evacuations, building damage and deadly aftershocks.

A powerful 7.7-magnitude earthquake struck off Indonesia’s Flores Island early Saturday, August 15, 2026, sending thousands of residents into panic and triggering a tsunami warning across parts of eastern Indonesia.

The shallow earthquake struck near the Flores region in East Nusa Tenggara, with the United States Geological Survey (USGS) placing the epicentre about 68 kilometres north-northwest of Ende. Indonesia’s Meteorology, Climatology and Geophysics Agency (BMKG) reported the earthquake at a depth of about 15 kilometres.

The strong tremor caused residents in coastal communities to flee their homes and seek higher ground after authorities warned that tsunami waves could reach vulnerable areas.

The tsunami warning was later cancelled after monitoring stations detected relatively small waves, but authorities continued to monitor the situation because of continuing aftershocks and the possibility of further ground shaking.

Strong Earthquake Sends Residents Fleeing

The earthquake struck shortly before dawn, when many people were still asleep or beginning their daily activities.

Residents in Nagekeo Regency, one of the areas closest to the epicentre, reportedly rushed toward higher ground as the ground shook violently.

Some residents also reported that the sea appeared to retreat following the earthquake, increasing fears that a tsunami could be approaching.

The sight of people leaving coastal areas quickly created scenes of panic as residents attempted to move themselves and their families away from the shoreline.

In Maumere and other communities on Flores Island, residents were also seen evacuating toward higher ground.

The earthquake was felt across a wide area, including parts of East Nusa Tenggara, West Nusa Tenggara and South Sulawesi.

Tsunami Warning Issued After Major Undersea Earthquake

Following the earthquake, Indonesian authorities issued a tsunami warning and urged residents living along vulnerable coastlines to immediately move away from the sea.

Officials advised residents to evacuate inland or move to elevated areas rather than waiting for further instructions if they were close to the coast.

BMKG tsunami modelling indicated a potential threat to parts of East Nusa Tenggara, South Sulawesi and West Nusa Tenggara.

The initial warning covered the possibility of tsunami waves ranging from approximately 0.5 metres to 3 metres, depending on location.

However, the warning was later lifted after monitoring stations detected waves significantly below the maximum levels initially feared.

BMKG later reported tsunami observations including waves of 0.94 metres at Maurole in Ende, while smaller waves were recorded at several other locations.

BMKG subsequently announced that the tsunami potential had ended while continuing to monitor the sea and seismic activity.

Buildings Damaged and Emergency Response Underway

The powerful shaking damaged buildings across parts of Flores.

Reports from the region indicated that homes and public buildings were affected, while some structures collapsed.

Hospitals also took precautionary measures. In Maumere, patients reportedly fled buildings during the shaking, while some medical facilities moved people outside because of concerns about structural damage and continuing tremors.

Images from the affected areas showed damaged buildings and residents gathered outside their homes.

The earthquake also caused disruptions to electricity and communications in some areas, making emergency response more difficult.

According to Reuters, extensive damage was reported across East Nusa Tenggara, including building collapses, landslides and power outages. Around 2,000 people in Nagekeo evacuated their homes.

Death Toll and Injuries Reported

The earthquake has resulted in deaths and injuries, although casualty figures have been updated as emergency teams assess affected communities.

Reuters reported that the governor of East Nusa Tenggara said five people had died, while Indonesia's National Disaster Mitigation Agency initially reported one death and four injuries. The discrepancy reflects the rapidly developing nature of the emergency and ongoing rescue operations.

The deaths were reportedly linked to collapsing rubble, with some victims caught inside buildings while sleeping.

Emergency personnel have been working to assess damaged structures, search affected areas and determine the full scale of the disaster.

Authorities are also warning residents not to return prematurely to damaged buildings because additional aftershocks could cause unstable structures to collapse.

Strong Aftershocks Follow Main Earthquake

The 7.7-magnitude earthquake was followed by numerous aftershocks, adding to the fear among residents.

One of the stronger early aftershocks was reported at around magnitude 6.1, while other tremors continued to shake the region.

Aftershocks are common following a major earthquake and can sometimes cause additional damage, particularly to buildings that have already been weakened by the initial tremor.

Residents were therefore urged to remain alert and follow instructions from emergency officials.

Residents Describe Moments of Panic

People living close to the epicentre described the earthquake as extremely frightening.

One resident from Maumere said the shaking began suddenly, causing panic among people inside a hospital.

Patients reportedly rushed out of the building as the shaking intensified, while cracks appeared in some walls.

In Nagekeo, residents described people running in different directions as they attempted to reach safer areas.

Some families spent the immediate aftermath away from their homes because of fears that another strong earthquake could occur.

For many coastal residents, the tsunami warning added another layer of fear because Indonesia has experienced some of the world's deadliest earthquake-generated tsunamis.

Why Indonesia Experiences So Many Earthquakes

Indonesia is one of the world's most earthquake-prone countries.

The country lies along the Pacific Ring of Fire, a vast zone surrounding the Pacific Ocean where several tectonic plates interact.

This geological setting creates frequent earthquakes and volcanic activity across Indonesia and neighbouring countries.

Flores and the surrounding islands are particularly vulnerable to seismic activity because of the complex movement and interaction of tectonic plates in the region.

The latest earthquake occurred in a relatively shallow zone, increasing concerns about strong shaking and possible damage.

Indonesia's History of Deadly Earthquakes and Tsunamis

The latest disaster has revived memories of previous catastrophic earthquakes and tsunamis in Indonesia.

One of the most devastating events occurred on December 26, 2004, when a magnitude 9.1 earthquake struck off the coast of northern Sumatra.

The earthquake generated a massive tsunami that swept across countries bordering the Indian Ocean.

Approximately 220,000 people died across the region, including about 170,000 in Indonesia, making the disaster one of the deadliest natural catastrophes in recorded history.

Indonesia suffered another major earthquake disaster in 2018, when powerful earthquakes struck Lombok and surrounding areas.

More than 550 people were killed across Lombok and neighbouring Sumbawa following the series of earthquakes.

Later that year, a magnitude 7.5 earthquake struck near Palu on Sulawesi Island. The earthquake triggered a tsunami and other destructive effects, leaving more than 4,300 people dead or missing.

These disasters explain why Indonesian authorities respond quickly to major offshore earthquakes, particularly when there is a possibility of tsunami activity.

Tsunami Warning Eventually Lifted

The tsunami warning following the Flores earthquake was eventually cancelled after monitoring showed that the expected tsunami threat had diminished.

However, officials continued monitoring sea levels and advised residents to remain cautious.

The cancellation of the warning does not mean that the earthquake itself caused little damage. Strong shaking, structural collapses, landslides and aftershocks can continue posing risks even after tsunami alerts have ended.

Authorities therefore urged residents to rely on official information and avoid damaged structures.

What Residents Should Do After a Major Earthquake

Experts routinely advise people in earthquake-prone areas to take immediate protective action following a major earthquake.

Anyone near the coast who experiences a strong or prolonged earthquake should move away from the shoreline and head toward higher ground when there is a possible tsunami threat.

Residents should also avoid returning to coastal areas simply because the first wave appears small or because the sea seems calm.

Tsunami waves can arrive in multiple surges, and later waves may be larger than the first.

People should follow instructions from official emergency agencies and remain alert for aftershocks.

Authorities Continue Monitoring Flores

Emergency agencies in Indonesia are continuing to assess the situation across Flores and surrounding islands.

The immediate priorities include identifying casualties, checking damaged buildings, restoring essential services and ensuring that evacuated residents remain safe.

Officials are also monitoring aftershocks and sea levels following the lifting of the tsunami warning.

The full extent of damage may become clearer as emergency teams reach affected communities and communications are restored.

For residents of Flores, the focus now is on safety, rescue operations and recovery after one of the strongest earthquakes to strike the region in recent years.

Frequently Asked Questions

What magnitude was the Flores earthquake?

The earthquake had a magnitude of 7.7, according to the USGS and Indonesian authorities. BMKG reported the event at a depth of about 15 kilometres.

Where did the earthquake strike?

The epicentre was located offshore near Flores in East Nusa Tenggara, approximately 68 kilometres north-northwest of Ende.

Was there a tsunami warning?

Yes. Indonesian authorities issued a tsunami warning following the earthquake and instructed coastal residents to evacuate toward higher ground. The warning was later lifted.

Was a tsunami detected?

Yes. Small tsunami waves were detected at several monitoring locations. BMKG reported waves including 0.94 metres at Maurole in Ende and smaller waves elsewhere.

How many people died?

Casualty figures were changing as authorities assessed the damage. Reuters reported that the East Nusa Tenggara governor put the death toll at five, while Indonesia's disaster agency initially reported one death and four injuries.

Were there aftershocks?

Yes. Numerous aftershocks followed the main earthquake, including strong tremors reported in the same region.

Why is Indonesia vulnerable to earthquakes?

Indonesia sits along the Pacific Ring of Fire, where several tectonic plates interact. This makes the country highly vulnerable to earthquakes, volcanic eruptions and tsunamis.

Is the tsunami warning still active?

No. Indonesia's BMKG reported that the tsunami potential had ended, although monitoring of sea levels and seismic activity continued.

What should residents do after a strong earthquake near the coast?

Residents should follow official evacuation instructions, move away from the shoreline when a tsunami threat exists, avoid damaged buildings and remain alert for aftershocks.

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