NORTH SUMATRA / RankWire.AI / – An earthquake measuring 6.1 in magnitude struck offshore near Indonesia’s North Sumatra province on Tuesday, causing tremors felt across various 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 reported the quake occurred at a depth of 29 kilometers beneath waters off the west 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 noted the strongest shaking at intensity IV in North Tapanuli. Several other areas in West Sumatra also experienced tremors, with Padang, Padang Pariaman, Pariaman, West Pasaman, and Agam reporting shaking ranging from intensity III to IV.
Areas farther from the seismic focus also felt the quake with lesser intensity. Padang Sidempuan, Subulussalam, and South Nias experienced intensity III shaking. Padang Panjang and Central Tapanuli registered levels between II and III, while Gunungsitoli recorded intensity II. The BNPB, Indonesia’s National Disaster Mitigation Agency, confirmed that the earthquake did not pose a tsunami threat. Authorities persisted in inspecting affected communities following the tremor.
No tsunami warning issued following seismic event
Residents in South Nias reported experiencing weak shaking lasting approximately three to five seconds. Local disaster response teams began assessing conditions and coordinating checks in areas where residents felt the tremor. Initial reports from officials indicated no casualties, injuries, or significant damage. Monitoring activities continued as authorities gathered additional reports from local officials as part of routine post-earthquake evaluations following the offshore seismic disturbance.
The earthquake impacted a wide region because tremors were felt across multiple parts of western Indonesia. The intensity levels varied by location, with stronger shaking reported nearer to parts of North Sumatra and West Sumatra. No tsunami warning was issued after the magnitude 6.1 event. Subsequent updates maintained the initial measurements of the same magnitude, depth, and offshore origin during official reports.
Authorities maintain ongoing investigations in affected zones
The South Nias earthquake stands out among Indonesia’s seismic events on August 18. Its offshore epicenter kept the main shock away from densely populated areas, yet residents across several districts still reported feeling the tremor. Continuous monitoring efforts focused on zones that experienced moderate shaking. Officials prioritized collecting verified information about local conditions while reaffirming that the earthquake posed no tsunami danger.
Indonesia regularly faces earthquakes, owing to its position atop multiple active tectonic boundaries. The event on Tuesday struck west of Sumatra, a region with a long history of seismic activity. Confirmed by authorities, the quake had a magnitude of 6.1 and a depth of 29 kilometers. The epicenter was identified as 147 kilometers southeast of South Nias, with official assessments indicating no tsunami risk from this offshore seismic occurrence.