US: Magnitude-5.5 offshore earthquake occurs south of the Aleutian Islands, Alaska, at around 22:58 May 1

A magnitude-5.5 earthquake occurred south of the Aleutian Islands at around 22:58 May 1. The epicenter was about 101 km (63 miles) south-southwest of Nikolski. The tremor occurred at a depth of about 15 km (9 miles), and light shaking was probably felt throughout parts of the central Aleutian Islands. There have been no initial reports of damage or casualties as a result of the earthquake; however, significant damage is unlikely. It could take several hours until authorities can conduct comprehensive damage assessments, especially in remote areas. Light-to-moderate aftershocks are likely over the coming days; at least five aftershocks with magnitudes between 4.5 and 5.5 have already been observed between 23:01 and 23:10. The event has not prompted any tsunami advisories.

Officials may temporarily shut down transportation infrastructure in the tremor zone to check for damage. Minor disruptions could occur during shutdowns, but service will likely resume quickly if no damage is found. Utility outages are possible, particularly near the earthquake's epicenter.