Sirens Scream After Shallow 7.7 Jolt

A massive 7.7-magnitude earthquake tore through the sea off Indonesia’s Flores Island early Saturday, killing at least two people and sending tsunami warnings racing across the region before waves under a meter rolled ashore.

Quick Take

A 7.7-magnitude earthquake struck off Flores Island, Indonesia, at shallow depth early Saturday.
At least two people died and hundreds fled toward higher ground.
Indonesia’s meteorological agency (BMKG) and the U.S. Geological Survey (USGS) both issued tsunami warnings.
Tsunami waves under one meter hit several coastal areas before the warning was lifted hours later.

Powerful Quake Strikes Off Flores Island

The earthquake hit early Saturday morning local time, centered about 68 kilometers northwest of the town of Ende on Flores Island, according to the USGS. The quake struck at a shallow depth of 15 kilometers, a factor that tends to make shaking more intense at the surface. Indonesian and American agencies confirmed the same 7.7 magnitude within minutes of each other.

Al Jazeera reported at least two deaths tied to the quake, with the shaking felt strongly enough to send residents running from their homes. Video from the region showed buildings damaged and people fleeing toward higher ground along the coast. The USGS had already warned that casualties and damage were possible, calling the likely impact “relatively localized” given the quake’s offshore location.

Indonesia sits on the Pacific “Ring of Fire,” a zone where earthquakes and tsunamis strike often because of shifting tectonic plates. Saturday’s quake happened in the Flores Sea, a stretch of water with a history of dangerous underwater tremors. That history is why officials moved so fast to warn coastal communities the moment seismic sensors picked up the shaking.

Warning Issued, Then Lifted Within Hours

BMKG issued a tsunami warning covering Maluku, East Nusa Tenggara, West Nusa Tenggara, and parts of Sulawesi, urging people to move away from beaches and low-lying coastlines. The Pacific Tsunami Warning Center also flagged the risk based on early quake data. Hundreds of residents evacuated on foot toward higher ground as sirens and alerts spread through coastal towns.

Reuters reported that tsunami waves under one meter, or about three feet, actually reached several coastal areas of Indonesia. Officials lifted the warning roughly two to three hours after the quake once sea-level monitoring showed no further dangerous rise. That pattern—a fast initial alert followed by a calmer all-clear—is standard practice for Indonesia’s warning system.

Why Warnings Move Fast With Limited Certainty

Tsunami warning systems worldwide face the same basic tradeoff: waiting for full certainty costs time that coastal residents may not have. Research on these systems shows that relying on seismic data and coastal tide gauges alone has historically produced a high rate of false alarms, while waiting for deep-ocean confirmation often arrives too late to help with evacuations. BMKG’s process, built to issue a first warning within about five minutes of a quake, reflects that same tension between speed and precision.

That tradeoff means warnings sometimes get lifted quickly once new data comes in, as happened Saturday. Indonesia has faced criticism in the past for lifting warnings too soon, most notably after a 2018 tsunami connected to a landslide rather than direct quake shaking. Saturday’s event followed the more common script: a quake-driven warning, modest wave heights, and a formal all-clear within hours.

🚨 BREAKING: Magnitude 7.7 earthquake hits eastern Indonesia
• At least 20 people killed
• Dozens of aftershocks reported
• Rescue operations ongoing
• Tsunami warning later lifted
Reuters
Source: Reuters#BreakingNews #Indonesia #Earthquake #WorldNews pic.twitter.com/125fqv2MM2

— SanviUpdates🌏 (@SanviUpdates) August 15, 2026

Indonesian authorities continue monitoring aftershocks and coastal sea levels following the quake. The country’s national geophysics agency has urged residents in affected regions to stay alert and avoid beaches until local officials confirm conditions remain stable. No additional warnings had been issued as of Saturday.