M7.7 Mindanao Earthquake Triggers Tsunami Alerts Across Indonesia

A magnitude 7.7 tectonic earthquake struck the offshore region of Mindanao, Philippines on 8 June 2026 at 06:37 WIB (01:37 UTC). The epicentre was located about 244 km northwest of Karatung Island, North Sulawesi, at a depth of 47 km and was attributed to subduction‑zone activity.

Indonesia’s Meteorology, Climatology and Geophysics Agency (BMKG) issued an early‑warning tsunami alert for dozens of coastal districts, placing areas such as North Sulawesi (including the Sangihe Islands), Gorontalo, Central Sulawesi, North Maluku and East Kalimantan on “Siaga” (alert) status and others on “Waspada”. Minor sea‑level rises of 9‑18 cm were recorded at three monitoring stations, with a maximum of 75 cm reported in Paleng, Sangihe. Subsequent monitoring showed no significant wave growth, and BMKG formally cancelled the tsunami warning later the same day.

Aftershocks up to magnitude 6.7 were logged. Residents of the Sangihe Islands evacuated to higher ground; dozens of households and a few public buildings suffered damage, but no deaths were reported. BMKG and local disaster agencies continue to monitor seismic activity and advise coastal communities to remain vigilant.