Alaska earthquakes

M2.7 earthquake 32 km WSW of Tyonek, Alaska

A magnitude 2.7 earthquake struck 32 km WSW of Tyonek, Alaska on Sun, Oct 21, 2018, 10:10 AM AKDT (18:10 UTC), 75 km (46 mi) below the surface.

A larger quake followed: M5.0 Southern Alaska. This one was a foreshock.

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

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The earthquake

Magnitude: 2.7 (ML, local (Richter)), micro
Magnitude from: Alaska Earthquake Center
Local time: Sun, Oct 21, 2018, 10:10 AM AKDT
UTC: 2018-10-21 18:10:47 UTC
Depth: 74.7 km (46.4 mi), intermediate-depth
Epicenter: 60.942° N, 151.688° 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
2.7	ML, local (Richter)	Alaska Earthquake Center	Preferred · Preliminary
2.7	ML, local (Richter)	USGS National Earthquake Information Center	Reviewed

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Stations used: 98

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: at least 202 in the 60 days after this one and 121 in the 30 days before it.

After

The first 60 of at least 202.

Before

Earthquakes today Alaska earthquakes Live radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event ak018diis2x4 (also filed as ak20288525, us1000hfb1). Read Sat, Oct 3, 2026, 4:37 AM UTC.