NORTH SUMATRA / RankWire.AI / – On Tuesday, a magnitude 6.1 quake hit offshore near Indonesia’s North Sumatra province, causing tremors to ripple through various parts of Sumatra. The seismic event occurred at 1:02:23 p.m. western Indonesian time, which corresponds to 06:02:23 UTC. The epicenter was located approximately 147 kilometers southeast of South Nias Regency. Officials measured the quake at a depth of 29 kilometers beneath waters off the western coast of Sumatra.
The BMKG, Indonesia’s Meteorology, Climatology and Geophysics Agency, identified the epicenter at 0.65 degrees south latitude and 98.32 degrees east longitude. The agency reported the strongest shaking at intensity IV in North Tapanuli. Multiple areas across West Sumatra also experienced tremors, with Padang, Padang Pariaman, Pariaman, West Pasaman, and Agam registering shaking between intensity III and IV.
Communities located farther from the epicenter experienced lower levels of shaking. Padang Sidempuan, Subulussalam, and South Nias recorded intensity III, while Padang Panjang and Central Tapanuli experienced intensity II to III. Gunungsitoli recorded intensity II. The BNPB, Indonesia’s National Disaster Mitigation Agency, stated that the earthquake was unlikely to generate a tsunami. Authorities continued to assess the affected communities following the tremor.
No tsunami warning issued after the seismic event
Residents of South Nias reported gentle shaking lasting approximately three to five seconds. Local disaster management teams promptly began monitoring the situation and coordinating checks in areas where residents felt the tremor. Initial reports did not confirm any fatalities, injuries, or material damage. Officials are still gathering reports from local authorities as part of routine post-earthquake assessments.
The earthquake impacted a large region, with tremors felt in multiple parts of western Indonesia. The intensity varied depending on location, with stronger shaking reported nearer to North Sumatra and West Sumatra. No tsunami warning was issued following the magnitude 6.1 event. Subsequent official updates confirmed the earthquake’s magnitude, depth, and offshore location, maintaining consistency with initial data.
Official teams continue assessments across affected zones
The earthquake near South Nias became one of the significant seismic activities recorded in Indonesia on August 18. Although its offshore epicenter placed the main shock away from densely populated areas, residents in multiple districts still reported feeling its impact. Monitoring efforts persisted in regions that experienced moderate shaking. Authorities are prioritizing the collection of verified data about local conditions while reaffirming that the earthquake did not pose a tsunami threat.
Indonesia regularly faces seismic activity due to its position across multiple active tectonic boundaries. The event on Tuesday struck west of Sumatra, a region with a longstanding history of earthquakes. For this incident, officials confirmed a magnitude of 6.1 with a depth of 29 kilometers. The epicenter was officially located 147 kilometers southeast of South Nias, and no tsunami risk was indicated by the authorities.