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Indonesia seismic activity: June–August 2026

Updated 4 times since CLSTR started tracking revisions of this situation.

What changed

2026-08-15 01:53 UTC → 2026-08-15 02:25 UTC · added removed

The seismic swarm initiated by the June 8 Mw 7.7 Sulawesi Sea earthquake continued through August 2026. The initial June 8 event triggered tsunami warnings and minor sea-level anomalies across North Sulawesi and North Maluku. Following this, a Mw 5.2 quake struck near Karatung Island on June 13, followed by a devastating Mw 6.7 earthquake on June 16 near Palu, Central Sulawesi. The June 16 event caused significant damage to over 2,000 households, killed at least three people, and injured dozens, prompting a state series of emergency in the Sigi district. Activity persisted through July with various tremors, including a Mw 6.2 quake off Halmahera on July 3, a Mw 5.5 in the Sunda Strait on July 7, and a Mw 5.4 tremors in Buol on July 12. On July 24, Mw 5.4 and Mw 5.7–5.8 quakes occurred near Enggano Island June and Ternate. A Mw 5.3 thrust-fault event near Kupang on July 26 caused public panic but no casualties. In August, July, activity remained high. intensified in mid-August. A Mw 5.3 quake struck the Sangihe Islands on August 14. This was followed by a powerful Mw 7.7 earthquake struck the Flores region on August 15 14–15, with the epicenter located in the sea near Flores Island. The Flores quake, occurring Ende or northeast of Mbay at a depth of 10 to 15 km, km. Attributed to the Flores back-arc thrust fault, the quake was felt as far as Lombok. The event triggered tsunami warnings for East Nusa Tenggara, West Nusa Tenggara, South Sulawesi, and Southeast Sulawesi. Waves between 0.19 and 0.94 meters were detected detected, with the highest recorded in areas including Sikka, Labuan Bajo, Baubau, and Maurole, Ende. The Meteorology, Climatology, While the BMKG eventually lifted the tsunami warnings, the earthquake caused casualties and Geophysics Agency (BMKG) categorized several regions significant structural damage. In Sikka Regency, at least one person died after being trapped under ‘Siaga’ (Alert) status, including northern Manggarai, Ngada, West Manggarai, Ende, Sikka, Selayar, Jeneponto, debris at the Lorens Say Pier waiting room, with additional fatalities and Bantaeng. Significant injuries reported at El Say Port. In Manggarai Regency, significant damage was reported at the Ben Mboi Regional Hospital and the St. Paulus Catholic University campus. Dozens of aftershocks, including magnitudes of 5.6, 5.9, and 6.2, were recorded. Damage was reported on Flores Island, including structural damage to homes in Manggarai Timur have been recorded, and the Catholic University of Indonesia Santu Paulus Ruteng. authorities have advised residents to remain vigilant.

Versions

  1. 2026-08-15 02:25 UTC Indonesia seismic activity: June–August 2026
  2. 2026-08-15 01:53 UTC Indonesia seismic activity: June–August 2026
  3. 2026-08-15 01:16 UTC Indonesia seismic activity: June–August 2026
  4. 2026-08-14 23:57 UTC Indonesia seismic activity: June–August 2026
  5. 2026-07-27 00:41 UTC Indonesia earthquake activity June‑July 2026

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