Deadly 7.7-magnitude earthquake hits Flores Sea near Ende, Indonesia

Overview

Updated Sep 2

A magnitude 7.7 earthquake hit the Flores Sea before dawn on August 15, local time, 68 kilometers (42 miles) north-northwest of Ende, Indonesia. At least 47 people died, buildings collapsed across the region, and small tsunamis reached 16 coastal locations in four provinces.

The quake ruptured just 10 kilometers (6 miles) below the seafloor, shallow enough to amplify shaking across Flores and nearby islands. The US Geological Survey estimated roughly 2 million people felt strong to severe shaking. Indonesia's meteorological agency, BMKG, has recorded 9,765 aftershocks since, and rescue teams had not yet reached Nagekeo, the district closest to the epicenter.

Why it matters

A shallow quake in a densely populated, tsunami-prone region put roughly 2 million people in the shaking zone and tested Indonesia's tsunami warning system.

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Key Indicators

7.7

Main shock magnitude

Struck at 10 km depth, 68 km NNW of Ende, on August 14, 2026 UTC.

9,765

Aftershocks recorded by BMKG

As of August 30; 155 were felt and the largest measured 6.1.

47+

Confirmed deaths

Officials expect the toll to rise as isolated districts are reached.

4,500+

Homes damaged

BNPB also counted 122 health facilities, 252 schools, and 84 places of worship damaged.

2 million

People in strong-to-severe shaking zone

USGS estimate of exposure to MMI VI-VIII shaking from the main shock.

Voices

Curated perspectives — historical figures and your fellow readers.

Ever wondered what historical figures would say about today's headlines?

People Involved

Faisal Fathani

Head of Indonesia's Meteorology, Climatology, and Geophysical Agency (BMKG)

Leading the agency's earthquake monitoring and tsunami warning response

Rudi Darmoko

Police chief of East Nusa Tenggara province

Coordinating the provincial emergency response

Fathur

Rescue official in East Nusa Tenggara

Coordinating efforts to reach Nagekeo district

Organizations Involved

United States Geological Survey

Federal science agency

Monitored the quake and issued ShakeMap, PAGER, and ground-failure assessments

The USGS monitors earthquakes globally and issues ShakeMap, PAGER, and ground-failure assessments for significant events.

Meteorology, Climatology and Geophysics Agency (BMKG)

Indonesian government agency

Issued and later lifted the tsunami warning; tracks the aftershock sequence

BMKG is Indonesia's national agency for meteorology, climatology, and geophysics, responsible for earthquake monitoring and tsunami warnings.

National Disaster Management Agency (BNPB)

Indonesian government disaster agency

Coordinating emergency response and damage assessment

BNPB is Indonesia's national disaster management agency, coordinating emergency response, relief, and reconstruction.

Timeline

7 events Latest: August 30th, 2026 · 2 weeks ago

Tap a bar to jump to that date

August 2026
Aftershock count passes 9,700; USGS lists quake in monthly report
Latest Monitoring

BMKG recorded 9,765 aftershocks by August 30, 155 felt, the largest at 6.1. The USGS published the event in its significant earthquakes listing.
August 30th, 2026
BNPB reports thousands of damaged buildings
Damage assessment

More than 4,500 homes, 122 health facilities, 252 schools, and 84 places of worship were damaged.
August 17th, 2026
Tsunami warning issued, then lifted
Warning

BMKG urged coastal residents to move to higher ground, then lifted the warning after tide gauges showed no major sea-level change. Small tsunamis still reached 16 locations.
August 15th, 2026
Death toll reaches at least 47
Casualties

Buildings collapsed across East Nusa Tenggara and power cuts disrupted communications, complicating rescue efforts.
August 15th, 2026
Landslides isolate Nagekeo, the district closest to the epicenter
Access

Road access was blocked by landslides and communications disrupted; a rescue team attempted to reach the area by ferry.
August 15th, 2026
M7.7 earthquake strikes Flores Sea near Ende
Earthquake

A shallow magnitude 7.7 quake hit 68 km NNW of Ende at 10 km depth, caused by reverse faulting.
August 14th, 2026 • 21:58 UTC
Strong aftershocks follow near Labuan Bajo and Ende
Aftershock

A magnitude 5.9 quake near Labuan Bajo and a 6.1 quake north of Ende hit shortly after the mainshock.
August 14th, 2026

Scenarios

Emergency response ends; Flores reconstruction begins

Likely Resolves by Nov 30, 2026

Discussed by: BNPB, AP News

Rescue teams reach Nagekeo and other isolated districts, the death toll stabilizes, and BNPB formally closes the emergency response phase. BMKG expects the elevated aftershock rate to decay within two to three weeks of the mainshock, clearing the way for rebuilding.

Death toll climbs past 100 as isolated districts are reached

Possible Resolves by Oct 31, 2026

Discussed by: AP News, The Guardian

Landslides blocked road access to Nagekeo, the district closest to the epicenter, for days after the quake. If damage there is severe, the confirmed toll could rise well above the initial 47 deaths as assessment teams arrive by ferry and communications are restored.

Aftershock above magnitude 6.5 hits the shaking zone

Unlikely Resolves by End of 2026

Discussed by: USGS, BMKG

The sequence had already produced 9,765 aftershocks by August 30, the largest at 6.1. A larger event could topple buildings weakened by the mainshock and trigger fresh landslides, though aftershock statistics make this the least likely path.

Historical Context

3 moments from history that rhyme with this story — and how they unfolded.

December 1992

Flores earthquake and tsunami (1992)

A magnitude 7.8 earthquake struck just 63 kilometers east-southeast of the August 2026 epicenter, off Flores Island's north coast. The quake generated a tsunami that destroyed tens of thousands of homes and killed at least 2,500 people.

Then

Entire coastal villages on Flores and nearby islands were destroyed, making it one of Indonesia's deadliest tsunamis of the 20th century.

Now

The 1992 disaster remains the reference point for tsunami risk in eastern Indonesia and underpins why authorities in 2026 issued a warning within minutes.

Why this matters now

The 2026 quake struck almost exactly where 1992 did. The parallel explains both the region's hazard and the speed of the warning response.

December 2004

Indian Ocean earthquake and tsunami (2004)

A magnitude 9.1 earthquake off Sumatra generated a tsunami that killed roughly 230,000 people across 14 countries, more than 160,000 of them in Indonesia. Waves reached coastlines within minutes, before any warning could be issued.

Then

The catastrophe revealed that the Indian Ocean had no tsunami warning system. Indonesia lost entire coastal communities in Aceh.

Now

It led to the Indian Ocean Tsunami Warning and Mitigation System and expanded Indonesia's network of tide gauges and seismic stations, including the tools BMKG used in 2026.

Why this matters now

The 2004 disaster is why a warning went out within minutes of the Flores quake, and why coastal residents moved to higher ground before the waves arrived.

September 2018

Palu earthquake and tsunami (2018)

A magnitude 7.5 earthquake struck near Palu on Sulawesi Island. BMKG issued a tsunami warning but lifted it within about 30 minutes; a tsunami still struck Palu Bay, killing more than 4,300 people.

Then

The Palu disaster raised sharp questions about the speed and accuracy of Indonesia's tsunami warnings and led to criticism and lawsuits against BMKG.

Now

BMKG revised its warning procedures and public messaging after Palu, though the fundamental challenge of detecting tsunamis within minutes remains.

Why this matters now

In August 2026, small tsunamis reached 16 locations after the warning was lifted. The Palu precedent shows why the decision to lift a warning carries real risk.