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Magnitude 7.7 earthquake strikes off Flores, Indonesia, triggering tsunami warning
Lombok newsLombok11 min read
On August 15, 2026, at 5:58 AM local time, a magnitude 7.7 earthquake occurred off the north coast of Flores, Indonesia, one of the Lesser Sunda Islands east of Bali. The USGS has reported over a dozen aftershocks ranging from M4.5 to M6.1. Initial estimates from the USGS PAGER indicate a likelihood of hundreds of fatalities, with 26,000 people experiencing intensity IX violent shaking and 558,000 experiencing intensity VIII severe shaking. News reports confirm at least two deaths and significant building damage, including collapsed facades. The earthquake, a large, shallow, thrust-type event, prompted a tsunami warning. Wave heights of 0.2-0.5 meters were detected, with the largest reported at 0.94 meters about three feet in Maurole-Ende, approximately 50 kilometers east of the epicenter. The event occurred along the Flores Thrust, a hazardous fault system extending from eastern Java past Bali, Lombok, Sumbawa, and Flores. This fault system is known for its unusual tectonic position, involving a 'backthrust' mechanism. The 1992 M7.8 Flores earthquake, which caused a large tsunami and over 2,000 deaths, occurred on the same fault system. The current earthquake's rupture is consistent with the expected length for a M7.7 event, starting in the east and propagating westward. The seismogenic part of the Flores Thrust, where large earthquakes occur, is located closer to land on a steeper ramp fault, rather than the shallow, gently dipping fault further offshore.
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