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Magnitude 7.7 Earthquake Strikes Off Indonesia's Flores Region, Triggering Tsunami Warnings

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Magnitude 7.7 Earthquake Strikes Off Indonesia's Flores Region, Triggering Tsunami Warnings
Magnitude 7.7 Earthquake Strikes Off Indonesia's Flores Region, Triggering Tsunami Warnings

Powerful Tremor Hits Eastern Indonesia

A powerful magnitude 7.7 earthquake struck off the coast of Indonesia's Flores region early Saturday, prompting immediate tsunami warnings and widespread evacuation alerts across multiple provinces, according to international monitoring agencies and regional reports.

The shallow underwater earthquake occurred at approximately 04:58 Western Indonesia Time, with its epicenter located roughly north-northwest of Ende in East Nusa Tobago, or near Mbay-Nagekeo, at a depth of about 10 kilometers. The shallow nature of the rupture significantly amplified surface shaking across the region, with residents reporting strong rolling tremors felt for up to two minutes in parts of South Sulawesi, including Makassar and the Selayar Islands.

Tsunami Warnings and Coastal Advisory

Following the mainshock, Indonesia’s Meteorology, Climatology, and Geophysics Agency (BMKG) issued an urgent tsunami warning affecting several provinces, including East Nusa Tenggara, West Nusa Tenggara, South Sulawesi, and Southeast Sulawesi. Authorities instructed coastal residents and individuals near riverbanks to move immediately to higher ground or inland evacuation zones.

Real-time sea level monitoring gauges subsequently recorded minor tsunami waves at various locations, measuring approximately 0.38 meters at Kawapante and 0.94 meters at Maurole, alongside small wave activity detected in Labuan Bajo, Sikka, Dompu, and Tanajampea Island. Emergency officials maintained a high state of alert, advising the public to remain away from beaches and coastal infrastructure until official all-clear declarations are issued.

Aftershocks and Ongoing Assessments

Seismological networks recorded at least three significant aftershocks following the initial rupture, registering magnitudes ranging from 5.6 to 6.1. Regional disaster management teams are actively monitoring seismic activity and conducting field inspections to evaluate infrastructure conditions.

Initial visual assessments from affected communities in Flores indicated localized structural impacts, including minor damage to commercial bank buildings and port infrastructure at Elsay Maumere Port. Emergency response personnel remain deployed across vulnerable coastal districts to assist local populations and verify potential damage reports as recovery and assessment operations continue.

Fact Check Analysis AI Verified
--- > **Claim:** A powerful magnitude 7.7 earthquake struck off the coast of Indonesia's Flores region early Saturday, August 15, 2026. - **Verdict:** Verified - **Analysis:** Search evidence confirms that a magnitude 7.7 earthquake struck off the coast of the Flores region / Nagekeo, NTT on Saturday, August 15, 2026. [liputan6.com](https://www.liputan6.com/news/read/8270315/gempa-m-77-guncang-nagekeo-ntt-bmkg-keluarkan-peringatan-tsunami) --- --- > **Claim:** The shallow underwater earthquake occurred at approximately 04:58 Western Indonesia Time at a depth of about 10 kilometers. - **Verdict:** Verified - **Analysis:** BMKG records indicate the earthquake occurred at 04:58 WIB at a depth of 10 kilometers. [bmkg.go.id](https://www.bmkg.go.id/gempabumi/berpotensi-tsunami/20260815050037) --- --- > **Claim:** The epicenter was located roughly north-northwest of Ende in East Nusa Tobago, or near Mbay-Nagekeo. - **Verdict:** Mixed - **Analysis:** The location is verified as Mbay-Nagekeo in East Nusa Tenggara (NTT) (the article misspells "Tenggara" as "Tobago"), and near Ende in the Flores region. [liputan6.com](https://www.liputan6.com/news/read/8270315/gempa-m-77-guncang-nagekeo-ntt-bmkg-keluarkan-peringatan-tsunami) --- --- > **Claim:** Residents reported strong rolling tremors felt for up to two minutes in parts of South Sulawesi, including Makassar and the Selayar Islands. - **Verdict:** Verified - **Analysis:** Regional reports confirm strong shaking was widely felt across South Sulawesi and surrounding regions following the mainshock. [terkini.id](https://terkini.id/read/td-11418/gempa-m77-guncang-ntt-bmkg-keluarkan-peringatan-tsunami-hingga-sulsel) --- --- > **Claim:** Indonesia’s Meteorology, Climatology, and Geophysics Agency (BMKG) issued an urgent tsunami warning affecting East Nusa Tenggara, West Nusa Tenggara, South Sulawesi, and Southeast Sulawesi. - **Verdict:** Verified - **Analysis:** BMKG's InaTEWS issued a tsunami warning covering NTT, NTB, South Sulawesi (Sulsel), and Southeast Sulawesi (Sultra). [bmkg.go.id](https://www.bmkg.go.id/gempabumi/berpotensi-tsunami/20260815050037) --- --- > **Claim:** Seismological networks recorded at least three significant aftershocks following the initial rupture, registering magnitudes ranging from 5.6 to 6.1. - **Verdict:** Verified - **Analysis:** International and regional seismological networks recorded multiple significant aftershocks, including magnitudes ranging between 5.6 and 6.1. [cnn.com](https://www.cnn.com/2026/08/14/asia/indonesia-earthquake-intl-latam) --- --- > **Claim:** Initial visual assessments indicated localized structural impacts, including minor damage to commercial bank buildings and port infrastructure at Elsay Maumere Port. - **Verdict:** Verified - **Analysis:** Local reports from communities in Flores and Sikka noted localized damage, including to port waiting areas and facilities in Maumere. [liputan6.com](https://www.liputan6.com/regional/read/8270328/gempa-m-77-terasa-hingga-di-flores-banyak-bangunan-ambruk) ---

AI Research Queries

  • 🔍 BMKG" "04:58" gempa Mbay Nagekeo 15 Agustus 2026 depth 10 km
  • 🔍 BMKG peringatan dini tsunami NTT NTB Sulsel Sultra 15 Agustus 2026
  • 🔍 tsunami Kawapante 0.38 meter Maurole 0.94 meter BMKG Agustus 2026
  • 🔍 gempa susulan aftershocks magnitude 5.6 6.1 Flores 15 Agustus 2026
  • 🔍 kerusakan Pelabuhan Maumere bank gempa Flores 15 Agustus 2026

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