At roughly 6:30 a.m. local time Thursday, the ground shook for 10 to 20 continuous seconds across a stretch of eastern Indonesia. Residents in Ternate and Bitung — cities bordering the Molucca Sea — described running from their homes as windows cracked and buildings groaned. Within minutes, Indonesia's meteorological agency issued a tsunami warning. The Pacific Tsunami Warning Center in Hawaii told the region to prepare for hazardous waves within 1,000 kilometers. Then, the sea moved.
A magnitude 7.4 earthquake had struck the Northern Molucca Sea, roughly 120 kilometers (75 miles) west-northwest of Ternate, at a depth of 35 kilometers. The U.S. Geological Survey initially detected it at a magnitude of 7.8 before revising downward. Reuters cited Indonesia's BMKG as recording it at magnitude 7.6. The discrepancy in early readings is common with large underwater quakes as seismometers collect additional data.
At least one person was confirmed killed. A 70-year-old woman died when a building used by the local sports authority collapsed in Manado, the capital of North Sulawesi province, according to Indonesia's Search and Rescue Agency and North Sulawesi police. At least three additional people were hospitalized in Ternate. Search and rescue teams were deployed to multiple affected areas as authorities worked to assess damage in more remote villages — a process that can take days in Indonesia's vast archipelago.
What the Tsunami Warning Actually Meant
Within minutes of the quake, the Pacific Tsunami Warning Center (PTWC) in Hawaii issued an alert that "hazardous tsunami waves are forecast for some coasts" across Indonesia, the Philippines, and Malaysia — a zone spanning roughly 1,000 kilometers from the epicenter.
Indonesia's BMKG chief Teuku Faisal Fathani initially warned of potential waves between 0.5 and 3 meters. In practice, the waves fell far below that worst-case threshold. BMKG recorded tsunami waves at five locations:
- North Minahasa, North Sulawesi: 0.75 meters (2.5 feet) — the highest recorded
- Bitung, North Sulawesi: approximately 0.2 meters (8 inches)
- North Maluku province: 0.3 meters (12 inches)
The PTWC lifted its tsunami warning just over two hours after the initial tremor, stating the threat "has now passed." The Philippine Institute of Volcanology and Seismology confirmed no destructive threat to the Philippines. Malaysia's Sabah, roughly 1,000 km from the epicenter, saw no tsunami impact.
Still, the warnings were not precautionary theater. A 7.4-magnitude earthquake at a depth of 35 kilometers in a tectonically volatile zone like the Molucca Sea can generate significant waves under the wrong conditions. Authorities' decision to immediately issue warnings and urge evacuations in Ternate and Tidore was consistent with standard protocol — and with Indonesia's painful history of being caught underprepared.
The Buildings That Didn't Hold
The most immediate physical impact was structural damage across the cities of Ternate and Manado, as well as surrounding areas. Indonesia's National Disaster Management Agency (BNPB) reported light to severe damage to structures in parts of Ternate, including at least one church and two residential houses. Video released by Indonesia's Search and Rescue Agency showed damaged facades, rubble in streets, and flattened structures in some locations.
In Bitung — a port city in North Sulawesi with a population of roughly 200,000 — damage assessments were still underway as of midmorning. The strong sustained shaking, which residents described as lasting 10 to 20 seconds, is particularly dangerous for older masonry buildings common in the region.
"We had just woken up and suddenly the earthquake hit... we all ran out of the house," Bitung resident Marten Mandagi told the Associated Press. "The shaking was very strong."
BNPB urged the public to remain calm and stay away from the coast while aftershock assessments continued. As of midmorning local time, roughly 50 aftershocks had been recorded, including one of magnitude 5.8 — large enough to be felt and potentially to extend building damage.
Why Indonesia Gets So Many Major Earthquakes
Indonesia sits at one of the most seismically complex intersections on Earth. The archipelago of more than 280 million people straddles the Pacific Ring of Fire — a belt of active tectonic plate boundaries stretching from South America, up the western coast of North America, across the Aleutian Islands, down through Japan and Southeast Asia, and south through New Zealand.
Specifically, the Northern Molucca Sea region where Thursday's quake struck is governed by the collision of the Molucca Sea microplate — a vanishing oceanic plate being consumed from both sides — with the Halmahera and Sangihe arcs. This creates an unusually complex triple-junction environment where multiple plates are simultaneously converging and subducting, generating frequent moderate-to-large seismic events.
The USGS noted that nine earthquakes of magnitude 7.0 or greater have occurred within 250 kilometers of Thursday's epicenter over the past 50 years. None caused extensive damage. However, the cumulative effect on regional infrastructure — poorly constructed buildings, aging concrete, informal construction on steep coastal terrain — means each large quake carries risk even when it doesn't produce a catastrophic tsunami.
Indonesia's Disaster System: What Worked, What Remains Difficult
Indonesia has significantly improved its earthquake and tsunami response systems since the 2004 Indian Ocean tsunami, which killed more than 170,000 Indonesians — the highest national death toll of any country in that catastrophe. The country rebuilt its warning infrastructure and expanded BMKG's monitoring capacity through successive administrations.
On Thursday, the system largely functioned as designed. Tsunami warnings were issued within minutes, coastal cities were urged to evacuate, and regional authorities activated emergency protocols. The PTWC's rapid coordination with BMKG allowed for updated threat assessments as real-time wave data came in, and the all-clear was issued within two hours.
What remains structurally difficult is the challenge of rapid damage assessment across Indonesia's 17,000-plus islands. Remote villages in the North Maluku and North Sulawesi regions may not have communications infrastructure capable of relaying damage reports quickly. BNPB acknowledged Thursday that its initial reports reflected a "partial picture," with assessments continuing in multiple areas.
The death toll, as of midmorning, remained at one confirmed. That number may rise as teams reach more distant communities, though the USGS assessed the probability of further casualties as "low" given the quake's characteristics and the relatively small tsunami waves recorded.
Regional Context: Indonesia in the Iran War's Shadow
The earthquake comes as Indonesia — the world's largest Muslim-majority nation — has been navigating growing pressure from its population to take a public stance on the U.S.-Iran war, which entered its 34th day on Thursday. Indonesian President Prabowo Subianto has called for an immediate ceasefire and offered to host diplomatic talks between the parties, though those efforts have produced no formal negotiations.
Indonesia's fuel situation has been affected by the Hormuz blockade like most Asian economies, though the country has larger domestic crude reserves than neighbors like Japan or South Korea and has been somewhat buffered from the worst supply shocks. The earthquake, centered in a region with no major oil infrastructure, is not expected to materially affect Indonesia's energy situation.
Indonesia has also been mourning its UNIFIL peacekeepers killed in Lebanon. Indonesia confirmed this week that three of its officers serving with the United Nations Interim Force in Lebanon were killed on duty and will receive posthumous promotions and compensation — a reflection of how broadly the ripple effects of the Iran war and the Lebanon ground conflict have extended.
What Comes Next
Indonesia's disaster agency has urged continued vigilance. While the PTWC lifted its tsunami warning Thursday morning, aftershocks from a magnitude 7.4 event can continue for days and occasionally trigger their own damage to structures already weakened in the initial quake. BNPB confirmed approximately 50 aftershocks by midmorning, including the 5.8-magnitude tremor.
Full damage assessments from the most remote parts of North Maluku and North Sulawesi were expected to take one to two days. Indonesian authorities have previous experience in rapid disaster mobilization — search and rescue teams, military logistics, and medical units were activated Thursday morning — but the dispersed geography of the affected zone remains the central operational challenge.
One person is confirmed dead. Dozens of buildings are damaged. Tsunami waves reached the shore and receded. The warning system held. What the full picture looks like in Ternate, Bitung, and the outer islands — those numbers are still coming in.