Massive quake: 6.2 magnitude tremors hit Alaska; no damage reported

An earthquake of magnitude 6.2 struck Alaska on Monday, according to the National Center for Seismology (NCS). The earthquake occurred at a depth of 48km, indicating potential aftershocks due to its shallow nature.

The NCS posted on X: "EQ of M: 6.2, On: 21/07/2025 03:58:02 IST, Lat: 54.99 N, Long: 159.98 W, Depth: 48 Km, Location: Alaska Peninsula."

EQ of M: 6.2, On: 21/07/2025 03:58:02 IST, Lat: 54.99 N, Long: 159.98 W, Depth: 48 Km, Location: Alaska Peninsula.
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— National Center for Seismology (@NCS_Earthquake) July 20, 2025

No damage has been reported yet.

This comes just days after the NCS reported another earthquake in Alaska registering 7.3 on the Richter Scale. This event on July 17 occurred at a depth of 36km, also suggesting vulnerability to aftershocks.

The NCS had shared on X: "EQ of M: 7.3, On: 17/07/2025 02:07:42 IST, Lat: 54.91 N, Long: 160.56 W, Depth: 36 Km, Location: Alaska Peninsula."

Shallow earthquakes pose greater risks compared to deeper ones because their seismic waves travel shorter distances to reach the surface, resulting in more intense ground movement and increased potential for structural damage and casualties.

The Alaska-Aleutian subduction system ranks among the world's most seismically active regions, recording the highest number of earthquakes above magnitude 8 in the past century. These seismic events and various landslides often generate tsunamis. The area features over 130 volcanoes and volcanic fields, accounting for more than 75% of active US volcanoes in the last 200 years.