Alaska earthquakes

M2.5 earthquake 164 km S of Adak, Alaska

A magnitude 2.5 earthquake struck 164 km S of Adak, Alaska on Sat, Aug 3, 2019, 5:54 PM HADT (02:54 UTC), 10 km (6 mi) below the surface.

A larger quake followed: M5.4 166 km SSW of Adak, 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
2.5 (ML, local (Richter)), micro
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2019-08-04 02:54:12 UTC
Depth
10.0 km (6.2 mi), shallow
Epicenter
50.404° N, 176.937° 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.ScaleComputed byNotes
2.5ML, local (Richter)USGS National Earthquake Information CenterPreferred · Reviewed · ±0.148 · 6 stations
2.3ML, local (Richter)Alaska Earthquake CenterPreliminary

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 7.1 km horizontally, 2.0 km in depth
Magnitude uncertainty
±0.15
Depth from
Operator assigned
Station coverage gap
251°, poorly surrounded by stations
Stations used
19

Nearby

Within 100 km, magnitude 1.5 and up: 20 in the 60 days after this one and 7 in the 30 days before it.

After

  1. 1.981 km SSE of Adak, Alaska · 2610 days ago · 20 km deep · 96 km away
  2. 2.6104 km SSE of Adak, Alaska · 2607 days ago · 10 km deep · 80 km away
  3. 2.1104 km SW of Adak, Alaska · 2605 days ago · 44 km deep · 96 km away
  4. 1.990 km SW of Adak, Alaska · 2604 days ago · 56 km deep · 94 km away
  5. 3.176 km S of Adak, Alaska · 2600 days ago · 21 km deep · 90 km away
  6. 2.1175 km S of Adak, Alaska · 2597 days ago · 23 km deep · 18 km away
  7. 1.6105 km SW of Adak, Alaska · 2597 days ago · 36 km deep · 90 km away
  8. 1.569 km SSW of Adak, Alaska · 2590 days ago · 26 km deep · 99 km away
  9. 2.5136 km SSW of Adak, Alaska · 2590 days ago · 10 km deep · 68 km away
  10. 2.6136 km SSW of Adak, Alaska · 2590 days ago · 10 km deep · 73 km away
  11. 1.898 km S of Adak, Alaska · 2590 days ago · 42 km deep · 66 km away
  12. 1.9125 km SW of Adak, Alaska · 2589 days ago · 40 km deep · 78 km away
  13. 1.8112 km SW of Adak, Alaska · 2580 days ago · 25 km deep · 93 km away
  14. 5.4166 km SSW of Adak, Alaska · 2579 days ago · 10 km deep · 17 km away · felt by 1 · tsunami flag
  15. 1.8186 km S of Adak, Alaska · 2579 days ago · 12 km deep · 23 km away
  16. 2.2198 km S of Adak, Alaska · 2579 days ago · 10 km deep · 34 km away
  17. 3.6166 km SSW of Adak, Alaska · 2579 days ago · 10 km deep · 26 km away
  18. 1.6160 km SSW of Adak, Alaska · 2579 days ago · 25 km deep · 15 km away
  19. 1.7166 km SSW of Adak, Alaska · 2579 days ago · 48 km deep · 13 km away
  20. 2.789 km SSE of Adak, Alaska · 2572 days ago · 22 km deep · 99 km away

Before

  1. 2.8182 km S of Adak, Alaska · 2618 days ago · 10 km deep · 49 km away
  2. 2.297 km S of Adak, Alaska · 2620 days ago · 10 km deep · 69 km away
  3. 2.0152 km SW of Adak, Alaska · 2622 days ago · 26 km deep · 89 km away
  4. 1.7153 km S of Adak, Alaska · 2625 days ago · 18 km deep · 11 km away
  5. 3.8169 km S of Adak, Alaska · 2631 days ago · 10 km deep · 51 km away
  6. 2.592 km SSE of Adak, Alaska · 2635 days ago · 10 km deep · 91 km away
  7. 1.8154 km SSW of Adak, Alaska · 2636 days ago · 28 km deep · 51 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us7000585k (also filed as ak0199x9lfo8). Read Thu, Oct 1, 2026, 8:30 PM UTC.