NORTH SUMATRA / RankWire.AI / – On Tuesday, a seismic event measuring 6.1 in magnitude struck waters off Indonesia’s North Sumatra province, causing tremors felt across multiple regions of Sumatra. The earthquake’s occurrence was recorded at 1:02:23 p.m. western Indonesian time, which corresponds to 06:02:23 UTC. Its epicenter was located approximately 147 kilometers southeast of South Nias Regency. Authorities measured the quake’s depth at 29 kilometers beneath the waters west of Sumatra.
The Meteorology, Climatology and Geophysics Agency, known as BMKG, identified the epicenter at 0.65 degrees south latitude and 98.32 degrees east longitude. The agency’s reports indicated the highest observed shaking intensity was IV in North Tapanuli, with tremors also reaching several areas in West Sumatra. Specifically, Padang, Padang Pariaman, Pariaman, West Pasaman, and Agam experienced shaking ranging from intensity III to IV.
Communities located farther from the epicenter also experienced the earthquake but at lower levels of intensity. Shaking of intensity III was reported in Padang Sidempuan, Subulussalam, and South Nias. In Padang Panjang and Central Tapanuli, intensity ranged from II to III, while Gunungsitoli recorded intensity II. The National Disaster Mitigation Agency, BNPB, confirmed that the event did not pose a tsunami threat. Officials are actively assessing the affected communities following the tremor.
No tsunami warning issued after the quake
In South Nias, residents reported experiencing mild shaking lasting roughly three to five seconds. Disaster response teams at the local level initiated monitoring activities and coordinated inspections in areas where residents felt the tremor. Initial official reports indicated no fatalities, injuries, or significant property damage. Authorities continue to gather information from local officials as part of routine post-earthquake evaluations following this offshore seismic event.
The earthquake impacted a wide area, with tremors felt across several parts of western Indonesia. Intensity levels varied depending on proximity to the epicenter, with stronger shaking reported nearer to North Sumatra and West Sumatra. No tsunami warning was issued after the magnitude 6.1 event. Follow-up updates maintained the initial figures for magnitude, depth, and offshore location, confirming the event’s details during subsequent reports.
Authorities maintain ongoing assessments in affected zones
The earthquake near South Nias marked one of the significant seismic incidents recorded in Indonesia on August 18. Despite the offshore epicenter placing the main shock away from major population centers, several districts still reported feeling the tremor. Monitoring efforts persisted in areas that experienced moderate shaking, with officials prioritizing the collection of verified information about local conditions while reaffirming that the earthquake posed no tsunami danger.
Indonesia is prone to frequent earthquakes due to its position across multiple active tectonic boundaries. The event on Tuesday originated west of Sumatra, an area well-known for seismic activity. Confirmed by authorities, the quake registered a magnitude of 6.1 with a depth of 29 kilometers. The epicenter was identified as being 147 kilometers southeast of South Nias, and official evaluations ruled out any tsunami risk associated with this offshore seismic activity.