Magnitude 6.1 earthquake strikes off Sumba island, Indonesia

On October 4, 2026, a significant earthquake struck the waters off the coast of Sumba Island, Indonesia. The Indonesian Agency for Meteorology, Climatology and Geophysics (BMKG) reported the seismic event as having a magnitude of 6.1, with an epicenter located 14 kilometers southeast of the city of Kodi and a shallow focal depth of 10 kilometers. In contrast, international monitoring bodies, specifically the European-Mediterranean Seismological Centre (EMSC) and the United States Geological Survey (USGS), estimated the magnitude slightly lower at 5.9.

Despite the strength of the tremor, authorities have reported no casualties or significant damage as of now. The region is part of the Pacific Ring of Fire, a zone known for frequent tectonic shifts and intense volcanic and seismic activity. Because of this geological context, monitoring by both national and international agencies remains active to detect potential aftershocks or changes in the area’s stability. No further alerts or emergency declarations have been issued at this time.