M5.0 Earthquake Strikes Off Central Sulawesi Coast, No Tsunami Risk
A shallow tectonic quake rattled the waters near Luwuk on Monday afternoon; Indonesia's BMKG confirmed no tsunami threat and recorded one aftershock.
James St. John / Wikimedia Commons
A magnitude 5.0 earthquake struck off the coast of Central Sulawesi on Monday afternoon, September 21, 2026, shaking communities along the coast but triggering no tsunami warning.
Indonesia's meteorological and geophysics agency BMKG initially recorded the event at M5.3 before updating its parameters to M5.1. The quake struck at 14:31 local time (WIB) at a depth of 14 kilometres — shallow enough to be felt at the surface — with its epicentre located in the sea 26 kilometres southwest of Pulau Puah, Central Sulawesi, according to Kompas.tv.
BMKG's Director of Earthquakes and Tsunamis, Wijayanto, said tsunami modelling ruled out any coastal wave risk. He classified the event as a shallow tectonic earthquake caused by activity on an active fault, with a strike-slip mechanism — meaning the ground moved horizontally along the fault line rather than vertically.
Hasil analisis BMKG menunjukkan gempa bumi ini memiliki parameter update dengan magnitudo M5,1 pada kedalaman 14 km.— Wijayanto, Director of Earthquakes and Tsunamis, BMKG
Hasil pemodelan tsunami menunjukkan bahwa gempa bumi ini tidak berpotensi tsunami.— Wijayanto, Director of Earthquakes and Tsunamis, BMKG
By 14:50 WIB — less than 20 minutes after the main shock — BMKG had already detected one aftershock of M4.1. The agency said it would continue monitoring for further aftershock activity and urged residents to stay calm, avoid damaged buildings, and rely only on official BMKG communications.
Central Sulawesi sits within one of the world's most seismically active zones. The region has a history of destructive earthquakes, and BMKG maintains continuous real-time monitoring across the Indonesian archipelago.
Why it matters — Central Sulawesi is highly earthquake-prone, and even moderate shallow quakes can cause localised damage; the rapid official confirmation of no tsunami risk is the key public safety signal here.
⚠ Not yet confirmed
- The quake was felt by several people near the epicentre
- specific distance of 34 km west-northwest of Luwuk (unsupported by source)
- VolcanoDiscovery report of M5.0 at 10 km depth (unsupported by provided sources)
- No significant damage or injuries reported
Sources differ on Earthquake magnitude: M5.0 (volcanodiscovery.com) vs M5.1 (updated from initial M5.3) (kompas.tv)
Sources differ on Depth of hypocentre: ~10 km (volcanodiscovery.com) vs 14 km (kompas.tv)
Reported by usgs.gov, volcanodiscovery.com, kompas.tv
