Alaska earthquakes

M3.4 earthquake 216 km W of Adak, Alaska

A magnitude 3.4 earthquake struck 216 km W of Adak, Alaska on Sat, Jun 30, 2018, 8:41 PM HADT (05:41 UTC), 147 km (91 mi) below the surface.

A larger quake followed: M4.2 Andreanof Islands, Aleutian Islands, Alaska. This one was a foreshock.

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The earthquake

Magnitude: 3.4 (mb, body-wave), minor
Magnitude from: USGS National Earthquake Information Center
Local time: Sat, Jun 30, 2018, 8:41 PM HADT
UTC: 2018-07-01 05:41:30 UTC
Depth: 146.7 km (91.1 mi), intermediate-depth
Epicenter: 51.907° N, 179.782° W
Region: Alaska
Tsunami flag: No
Status: Reviewed by a seismologist

Magnitude estimates

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
3.4	mb, body-wave	USGS National Earthquake Information Center	Preferred · Reviewed · ±0.147 · 11 stations
2.8	ML, local (Richter)	Alaska Earthquake Center	Preliminary

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty: About 6.2 km horizontally, 5.7 km in depth
Magnitude uncertainty: ±0.15
Depth from: From location
Station coverage gap: 127°
Stations used: 47

Nearby

Within 100 km, magnitude 1.5 and up: 146 in the 60 days after this one and 77 in the 30 days before it.

After

The first 60 of 146.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000fyff (also filed as ak19819330, ak0188d316l0). Read Fri, Oct 2, 2026, 7:07 AM UTC.