During the month of July 2025, the Alaska Earthquake Center reported 4676 earthquakes within the state with magnitudes ranging between 1.0 and 7.3 and depths ranging between 0 and 239 km. 

The largest earthquake was magnitude 7.3 that occurred on July 16 at 12:37:41 AKDT (July 16, 20:37:41 UTC), 53 miles S of Sand Point. This event was felt throughout the Alaska Peninsula and southern Alaska. Significant shaking was reported, but no major damage was reported. 

This earthquake prompted a tsunami warning for the Alaska Peninsula, and a tsunami advisory for much of the southern coast of Alaska, although these were ultimately cancelled after no sizable tsunami was generated. 

The aftershock sequence from this earthquake made up a majority of the seismic activity this month, producing over 2,700 aftershocks. The largest of these aftershocks was a magnitude 6.2 earthquake that occurred on July 20 at 14:28:01 AKDT, 61 miles SE of Sand Point. This event was reported as felt in King Cove, Sand Point, and Chignik Lagoon. Other notable aftershocks included 6 earthquakes above a magnitude 5, and 22 earthquakes above a magnitude 4. Several of these earthquakes were also reported as felt locally in the Sand Point area. You can find more information on the Sand Point Sequence by visiting the “Significant Event” page here.

There were 35 events this month of magnitude 4 or above. Most of these events were part of the Sand Point Sequence or elsewhere along the Alaska Peninsula and the Aleutian chain. 

In the mainland, there were two notable events near Iliamna Volcano, a M4.5 on July 5 and a M4.3 on July 14. These events were both felt in the Kenai Peninsula and Anchorage area. There were also two M4.4 events on July 3 and July 12 in the Mat-Su Valley that were felt throughout the area. 

We reported 88 seismic sources other than regional tectonic earthquakes. Of these, 62 were volcanic events of M1.4-2.4 at Mt. Spurr, and 26 were glacial events of M1.4-2.4 primarily located in the Prince William Sound, Icy Bay, Yakutat Bay, and Southeast Alaska. 

There were 24 earthquakes reported as felt in July.