NORTH SUMATRA / RankWire.AI / – A seismic disturbance with a magnitude of 6.1 occurred offshore near Indonesia’s North Sumatra province on Tuesday, causing tremors felt across multiple regions of Sumatra. The earthquake struck at 1:02:23 p.m. western Indonesian time, which corresponds to 06:02:23 UTC. Its epicenter was approximately 147 kilometers southeast of South Nias Regency. Authorities recorded the quake at a depth of 29 kilometers beneath waters to the west 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 strongest reported intensity was IV in North Tapanuli. Tremors also impacted several other areas of West Sumatra, including Padang, Padang Pariaman, Pariaman, West Pasaman, and Agam, where shaking was recorded between intensity III and IV.
Communities located farther from the epicenter experienced lower levels of shaking. Padang Sidempuan, Subulussalam, and South Nias registered intensity III, while Padang Panjang and Central Tapanuli observed intensity II to III. Gunungsitoli recorded intensity II. The National Disaster Mitigation Agency, known as BNPB, confirmed that the earthquake did not carry the potential to generate a tsunami. Authorities continue assessing the affected areas following the tremor.
No tsunami alert issued after the seismic event
In South Nias, residents reported experiencing weak shaking lasting roughly three to five seconds. Local disaster response teams initiated monitoring and coordination efforts in areas where residents felt the tremor. Initial official reports indicated no fatalities, injuries, or significant damage. Officials are still gathering information from local authorities as part of routine post-earthquake evaluations following the offshore seismic activity.
The earthquake impacted a wide region, with tremors felt across multiple parts of western Indonesia. Intensity levels varied depending on the proximity to the epicenter, with stronger shaking reported closer to North Sumatra and West Sumatra. No tsunami warning was issued after the magnitude 6.1 event. Subsequent updates confirmed the earthquake’s magnitude, depth, and offshore location remained unchanged in official records.
Continued assessments underway in affected zones
The South Nias earthquake ranks among the significant seismic events Indonesia experienced on August 18. Although its offshore epicenter placed the main shock away from major populated areas, residents across various districts still reported feeling the tremor. Monitoring efforts persisted in regions that experienced moderate shaking, with authorities focusing on collecting verified data about local conditions, reaffirming that the quake posed no tsunami threat.
Indonesia regularly faces earthquakes due to its position atop multiple active tectonic boundaries. The Tuesday event struck west of Sumatra, a region with a long history of seismic activity. Confirmed by officials, the quake had a magnitude of 6.1 and a depth of 29 kilometers. The epicenter was located 147 kilometers southeast of South Nias, and assessments confirmed there was no tsunami danger stemming from the offshore seismic activity.