7.7 Magnitude Earthquake Strikes Indonesia's Flores Island, Killing at Least Five

A powerful 7.7-magnitude earthquake struck off the coast of Flores Island in eastern Indonesia early Saturday morning, collapsing buildings, triggering a temporary tsunami warning, and sending thousands of panicked residents fleeing to higher ground. The shallow undersea quake hit at 4:58 a.m. local time, catching many people as they slept in their homes. The sudden, violent shaking lasted for approximately one minute in several districts, forcing families to scramble into the dark streets as walls cracked and roofs caved in around them. For residents of East Nusa Tenggara, the tremors brought immediate fears of a tsunami, prompting a chaotic mass exodus away from the coastline and toward higher elevations before emergency services could even issue official directives.[1][2]

The United States Geological Survey located the epicenter approximately 68 kilometers north-northwest of the coastal city of Ende, at a shallow depth of 10 kilometers. Indonesia's Meteorology, Climatology, and Geophysics Agency (BMKG) recorded the depth at 15 kilometers and identified the cause as movement along the Flores back-arc thrust fault. Shallow earthquakes are notoriously destructive because their seismic energy has less distance to dissipate before reaching the surface. Following the initial massive jolt, BMKG tracked dozens of subsequent aftershocks rippling through the same fault line. At least seven of these secondary tremors exceeded a magnitude of 5.0, with the largest measuring 6.1, further terrifying residents and threatening structures that had already been compromised by the main quake.[2][6]

At least five people were killed in the disaster, though authorities caution that the toll may rise as clearing operations continue. East Nusa Tenggara Governor Emanuel Melkiades Laka Lena confirmed during a press conference in Kupang that the victims—two from Sikka Regency and three from Manggarai Regency—died when heavy rubble from collapsing structures crushed them in their sleep. The national disaster mitigation agency, BNPB, reported that several others sustained severe injuries from falling debris. Emergency officials warned that the casualty count remains preliminary, as rescue teams are still working to clear debris, reach isolated communities, and restore communication lines that were severed when the power grid failed across multiple districts.[4][5][8]

The tremors caused severe structural damage across the region, which consists mostly of towns and villages with few high-rise buildings but many older concrete and masonry structures. In Maumere, the main commercial town in Sikka Regency, the second-floor waiting room at the Laurentius Say port terminal completely collapsed, sending a cloud of dust into the air as passengers waiting for inter-island ferries ran for their lives. Footage broadcast on local television networks showed harrowing scenes at hospitals in Ende and Maumere, where medical staff were forced to evacuate patients, beds, IV stands, and oxygen cylinders outdoors. Doctors and nurses quickly set up temporary triage centers in parking lots and courtyards to treat the injured as the hospital walls cracked around them.[3][7]

Immediately following the quake, BMKG issued a formal tsunami alert for the coastal provinces of East Nusa Tenggara, West Nusa Tenggara, South Sulawesi, and Southeast Sulawesi. BMKG earthquake and tsunami director Wijayanto warned that their modeling indicated potential waves ranging from 0.5 to 3 meters in height. Local disaster agencies broadcast urgent evacuation orders, instructing coastal communities to self-evacuate by moving at least two kilometers inland or seeking elevations higher than 10 meters. In Nagekeo regency, the area closest to the epicenter, witnesses reported seeing the ocean water temporarily retreat from the shoreline—a classic warning sign of an approaching tsunami—which accelerated the frantic rush to the hills.[1][6]

The tsunami warning was officially lifted approximately three hours later after coastal tide gauges recorded only minor sea-level changes, averting a secondary catastrophe. The highest wave detected by the monitoring network measured just 0.94 meters at Maurole in Ende, with smaller surges of around half a meter recorded in Bulukumba and Labuan Bajo. 'We have ended the tsunami warning but we will keep monitoring the sea level,' Wijayanto stated in a public broadcast, advising residents to remain cautious. Despite the all-clear for ocean threats, authorities strongly urged evacuees not to return to their homes immediately, warning that the ongoing swarm of powerful aftershocks could easily bring down buildings that had sustained unseen structural damage.[1][7]

Local authorities and the BNPB have deployed joint rescue teams, military personnel, and police units to assist the affected communities across Flores Island. Governor Laka Lena noted that provincial officials are coordinating closely with the central government in Jakarta to secure emergency logistical support, including medical supplies, temporary shelters, and heavy machinery required for clearing roads blocked by landslides. Personnel from the regional military command and the Navy have been mobilized to support emergency operations, but their progress has been hindered by the rugged, mountainous terrain of the island and the widespread power outages that have plunged many villages into darkness.[5][8]

Indonesia, a vast archipelago of more than 17,000 islands, sits directly along the Pacific 'Ring of Fire,' a horseshoe-shaped arc of intense seismic and volcanic activity that spans the Pacific basin. Flores Island is particularly vulnerable to tectonic shifts; in December 1992, a 7.7-magnitude earthquake in the exact same region triggered a devastating tsunami that swept inland, resulting in approximately 2,500 deaths. The memory of that disaster, along with the catastrophic 2004 Indian Ocean tsunami, remains deeply ingrained in the local consciousness, explaining the rapid and panicked self-evacuation that occurred Saturday morning the moment the ground began to shake.[1][6]