Magnitude 5.7 earthquake — Labuan, Indonesia

A magnitude 5.7 earthquake struck the sea south-west of Java, Indonesia, on 21 August 2026, according to the United States Geological Survey (USGS). The quake was recorded at 17:41 UTC with its epicentre located approximately 194 km south-west of Labuan, a coastal town in Banten province near the Sunda Strait, at coordinates 7.58°S, 104.55°E. USGS measured the depth at 10 km, a relatively shallow rupture, though the true source lay within the offshore subduction zone that runs along the southern edge of Java, an area of frequent seismic activity where the Indo-Australian plate slides beneath the Sunda plate.

USGS assigned the event a Green alert level, its lowest tier, indicating minimal likelihood of casualties or significant damage, and confirmed that no tsunami was generated. Ground shaking was estimated at a maximum Modified Mercalli Intensity of around 3.5 ("weak"), and only a single "Did You Feel It" report had been submitted to USGS at the time of writing, suggesting the tremor was felt lightly, if at all, on land given its considerable distance offshore. The agency listed the event's status as reviewed, based on data from 84 seismic stations, and no reports of damage, injuries or disruption in Labuan or surrounding areas of Banten had emerged following the earthquake.