A widely felt quake rattled Southcentral Alaska on Saturday

Plenty of people across Anchorage and the Kenai Peninsula felt the ground move just after 9:25 p.m. Saturday. The Alaska Earthquake Center, the regional authority that reviews the state's seismic records, put the event at magnitude 4.2, centered about 16 miles west-northwest of Hope and roughly 29 miles down — deep enough to be felt across a wide stretch of Southcentral, but far too small to do damage.

If you saw a bigger number in the first minutes after the shaking, that is normal. Early, automated estimates from other monitoring networks ran higher — up to about magnitude 5 — and placed the quake in slightly different spots around lower Cook Inlet before the regional center's reviewed solution settled the question. Those first-pass figures routinely get revised once a seismologist works through the data; the reviewed magnitude is the one to trust.

None of this is unusual here. Southcentral Alaska sits in one of the most seismically active regions in North America, and a quake this deep comes from the slab of Pacific plate grinding downward beneath the region — the same zone that produced the far larger 2018 Anchorage earthquake, but on a vastly smaller scale. Events of this size move through the area regularly, usually leaving nothing behind but a startled moment and a few rattled shelves. No damage or injuries were reported.