NORTH SUMATRA / RankWire.AI / – On Tuesday, a magnitude 6.1 quake struck offshore near Indonesia’s North Sumatra province, causing tremors felt across multiple regions of Sumatra. The seismic event took place 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. Officials recorded the earthquake at a depth of 29 kilometers beneath waters 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 agency’s report indicated the strongest shaking, rated at intensity IV, was experienced in North Tapanuli. Several areas in West Sumatra also felt tremors, with Padang, Padang Pariaman, Pariaman, West Pasaman, and Agam recording shaking between intensity III and IV.
Communities located farther from the epicenter experienced lower-intensity shaking. Padang Sidempuan, Subulussalam, and South Nias recorded intensity III tremors. Meanwhile, Padang Panjang and Central Tapanuli reported between intensity II and III, and Gunungsitoli experienced intensity II. The BNPB, Indonesia’s National Disaster Mitigation Agency, clarified that the earthquake did not pose a tsunami threat. Authorities are still assessing damage and checking in affected communities following the tremor.
No tsunami warning issued after the quake
Residents in South Nias reported feeling weak shaking lasting roughly three to five seconds. Local disaster management teams began monitoring the situation and conducting checks in areas where residents experienced tremors. Initial official reports confirmed no fatalities, injuries, or significant structural damage. Ongoing efforts involve collecting information from local officials to ensure accurate assessment after this offshore seismic event.
The earthquake impacted a wide region, with tremors reaching communities across several parts of western Indonesia. The intensity varied by location, with stronger shaking reported closer to North Sumatra and West Sumatra. No tsunami warning was issued following the magnitude 6.1 event. Subsequent updates maintained the same recorded magnitude, depth, and offshore location, confirming the initial assessment.
Continuous monitoring underway across affected zones
This earthquake near South Nias became one of the notable seismic incidents in Indonesia on August 18. While its offshore epicenter kept the main shock away from major population centers, residents in various districts still felt the tremor. Authorities are actively monitoring the situation in areas that experienced moderate shaking, with a focus on gathering verified information on local conditions. All assessments confirm that there is no tsunami risk associated with this offshore seismic event.
Indonesia regularly encounters earthquakes due to its position across multiple active tectonic boundaries. The event on Tuesday struck west of Sumatra, a region with a history of seismic activity. Confirmed details include a magnitude of 6.1 and a depth of 29 kilometers. The official epicenter location was 147 kilometers southeast of South Nias, with authorities concluding there was no tsunami threat from this offshore quake.