Thecuy.com, Jakarta – A 6.5-magnitude earthquake shook the Thousand Islands on Saturday, 12 September 2026 at 04:23 WIB. The tremor was initially recorded at M5.9 before being upgraded. The epicenter was 69 km northeast of the islands at a depth of 368 km, and no tsunami risk was issued. Vibrations were felt as far as Pariaman, Malang, and surrounding areas.
BMKG said the quake was an intraslab event, caused by the shift of a subducting slab. The movement mechanism was oblique normal, producing strong shaking despite the deep source. Intraslab earthquakes generally cause more intense ground motion than shallow earthquakes of comparable magnitude.
- Official magnitude: 6.5 (initially 5.9).
- Epicenter coordinates: 5.24°S, 106.78°E.
- Depth: 368 km.
- Duration of shaking felt across West Java, Central Java, and West Sumatra.
- No tsunami alert.
The disruption to transport was evident when KAI Daop 5 Purwokerto implemented an Extraordinary Stop (BLB) on eight trains. A full inspection found no damage to tracks, bridges or tunnels, allowing services to resume within 20‑60 minutes.
Meanwhile, BMKG recorded nearly 15,000 aftershocks in East Nusa Tenggara since 15 August 2026, including a magnitude 2.0 event at 01:21 WIB in Nagekeo Regency. This seismic activity suggests Indonesia remains in a post‑mainshock phase, although most aftershocks are low‑intensity.
This earthquake highlights the importance of disaster readiness, seismic monitoring, and inter‑agency coordination. Residents are urged to stay alert, follow official updates, and report any damage that may occur.
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