M3.5 earthquake 51 km S of Adak, Alaska

A magnitude 3.5 earthquake struck 51 km S of Adak, Alaska on Thu, Aug 29, 2019, 1:16 PM HADT (22:16 UTC), 45 km (28 mi) below the surface.

A larger quake followed: M4.0 59 km SE 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
3.5	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.093 · 28 stations
3.5	ML, local (Richter)	Alaska Earthquake Center	Preliminary

1 person reported to the USGS what they felt; the strongest reported shaking was II, weak shaking.

Reviewed by a seismologist.

Within 100 km, magnitude 1.5 and up: 135 in the 60 days after this one and 69 in the 30 days before it.

The first 60 of 135.

From the USGS Earthquake Hazards Program and its partner networks, event us700059yl (also filed as ak019b2xpoba). Read Fri, Oct 2, 2026, 2:32 AM UTC.