NORTH SUMATRA / RankWire.AI / – The recent offshore seismic event off Indonesia’s North Sumatra province resulted in noticeable tremors across multiple areas of Sumatra. The earthquake, registering a magnitude of 6.1, took place at 1:02:23 p.m. western Indonesian time, which corresponds to 06:02:23 UTC. Its epicenter was situated approximately 147 kilometers southeast of South Nias Regency. Authorities measured the quake’s depth at 29 kilometers beneath waters located west of Sumatra.
The BMKG, Indonesia’s Meteorology, Climatology and Geophysics Agency, pinpointed 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. Tremors also impacted several other regions in West Sumatra, with Padang, Padang Pariaman, Pariaman, West Pasaman, and Agam experiencing shaking levels between III and IV.
Areas farther from the epicenter also felt the tremors, albeit at lower intensities. Padang Sidempuan, Subulussalam, and South Nias recorded intensity III shaking. Padang Panjang and Central Tapanuli experienced shaking levels between II and III, while Gunungsitoli reported intensity II. The National Disaster Mitigation Agency, BNPB, stated that the earthquake posed no tsunami threat. Authorities continued to assess affected communities following the event.
No tsunami warning issued after the tremor
People in South Nias described the shaking as weak, lasting roughly three to five seconds. Local disaster response teams initiated monitoring efforts and coordinated inspections in areas where residents experienced the tremor. Initial official reports confirmed no fatalities, injuries, or property damage. Officials are still gathering information from local authorities as part of routine post-earthquake checks following this offshore seismic activity.
The earthquake affected a wide region, with tremors felt across several parts of western Indonesia. The intensity varied depending on location, with stronger shaking reported closer to North Sumatra and West Sumatra. No tsunami warning was issued after the magnitude 6.1 quake. Subsequent updates from official earthquake records maintained the same magnitude, depth, and offshore location details provided initially.
Ongoing assessments continue in impacted zones
This earthquake, recorded as one of the significant seismic events in Indonesia on August 18, originated offshore, placing the main shock away from densely populated areas, though residents in multiple districts still reported feeling it. Monitoring persists in zones that experienced moderate shaking, with authorities prioritizing the collection of verified data about local conditions while confirming that there is no tsunami threat.
Indonesia is prone to frequent earthquakes due to its position across several active tectonic boundaries. Tuesday’s event struck west of Sumatra, a region known for seismic activity. Authorities verified the earthquake’s magnitude at 6.1 with a depth of 29 kilometers. The epicenter’s position was confirmed to be 147 kilometers southeast of South Nias, and official reports indicated that there was no tsunami risk associated with this offshore seismic event.