Alaska earthquakes

M2.7 earthquake 128 km SSW of Atka, Alaska

A magnitude 2.7 earthquake struck 128 km SSW of Atka, Alaska on Thu, Aug 3, 2017, 9:46 PM HADT (06:46 UTC), 185 km (115 mi) below the surface.

A larger quake followed: M4.4 77 km ESE of Adak, Alaska. This one was a foreshock.

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The earthquake

Magnitude
2.7 (ML, local (Richter)), micro
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2017-08-04 06:46:47 UTC
Depth
184.7 km (114.8 mi), intermediate-depth
Epicenter
51.159° N, 175.032° W
Region
Alaska
Tsunami flag
No
Status
Reviewed by a seismologist

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 13.6 km horizontally, 9.7 km in depth
Stations used
9

Nearby

Within 100 km, magnitude 1.5 and up: 72 in the 60 days after this one and 40 in the 30 days before it.

After

The first 60 of 72.

Before

Earthquakes todayAlaska earthquakesLive radar here

Sources

From the USGS Earthquake Hazards Program and its partner networks, event us2000a4yf. Read Fri, Oct 2, 2026, 4:33 AM UTC.