Magnitude 5.6 earthquake — Skwentna, Alaska

A magnitude 5.6 earthquake struck sparsely populated backcountry in south-central Alaska on 8 August 2026, according to the US Geological Survey. The quake was centred roughly 57km west-north-west of Skwentna, a small, remote community north-west of Anchorage, at a depth of about 10km. USGS recorded the origin time as 04:50 UTC, which corresponds to approximately 8.50pm local time on Friday 7 August in Alaska. Seismologists classified the event as a reverse (thrust) faulting rupture, consistent with the complex tectonic environment of the Alaska Range, where the Pacific and North American plates interact.

The earthquake was felt across a wide area of south-central Alaska, with the USGS "Did You Feel It?" system logging over 1,100 reports from residents, giving the tremor a maximum reported intensity in the moderate-to-strong range on the Modified Mercalli scale. No tsunami warning was issued, and given the epicentre's inland, mountainous location far from the coast, none was expected. No damage or injuries have been reported, reflecting the low population density of the affected region, which lies within the rugged terrain of the Susitna basin area northwest of Anchorage and Wasilla. The Alaska Earthquake Center, which monitors seismicity across the state, also logged the event and noted the shaking was felt in communities to the east, though it has not reported any significant aftershock sequence or structural damage as of the latest available information.