M3.7 earthquake 46 km S of Adak, Alaska

A magnitude 3.7 earthquake struck 46 km S of Adak, Alaska on Thu, Jun 27, 2019, 2:01 AM HADT (11:01 UTC), 40 km (25 mi) below the surface.

A larger quake followed: M4.7 51 km SSW of Adak, Alaska. This one was a foreshock.

Map

Where this earthquake was located, with the others nearby. Select one for its page.

Different scales measure different things and differ by a few tenths. The USGS marks one as preferred, and it is the one this page uses.

Mag.	Scale	Computed by	Notes
3.7	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.115 · 19 stations
3.6	ML, local (Richter)	Alaska Earthquake Center	Preliminary

No one has reported feeling this quake to the USGS.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: 143 in the 60 days after this one and 69 in the 30 days before it.

The first 60 of 143.

From the USGS Earthquake Hazards Program and its partner networks, event us700045z2 (also filed as ak01986k7suh). Read Thu, Oct 1, 2026, 4:20 PM UTC.