Alaska earthquakes

M3.7 earthquake 230 km SW of Adak, Alaska

A magnitude 3.7 earthquake struck 230 km SW of Adak, Alaska on Sat, Apr 20, 2019, 11:49 AM HADT (20:49 UTC), 30 km (19 mi) below the surface.

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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
3.7 (mb, body-wave), minor
Magnitude from
USGS National Earthquake Information Center
Local time
UTC
2019-04-20 20:49:23 UTC
Depth
30.2 km (18.7 mi), shallow
Epicenter
50.425° N, 178.986° 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
3.7mb, body-waveUSGS National Earthquake Information CenterPreferred · Reviewed · ±0.135 · 14 stations
2.8ML, 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 3.7 km horizontally, 6.9 km in depth
Magnitude uncertainty
±0.14
Depth from
From location
Station coverage gap
230°, poorly surrounded by stations
Stations used
40

Nearby

Within 100 km, magnitude 1.5 and up: 12 in the 60 days after this one and 9 in the 30 days before it.

After

  1. 2.6232 km WSW of Adak, Alaska · 2721 days ago · 16 km deep · 82 km away
  2. 3.3Andreanof Islands, Aleutian Islands, Alaska · 2715 days ago · 35 km deep · 91 km away
  3. 2.9148 km WSW of Adak, Alaska · 2714 days ago · 35 km deep · 94 km away
  4. 3.4283 km SW of Adak, Alaska · 2698 days ago · 10 km deep · 56 km away
  5. 2.7289 km SW of Adak, Alaska · 2693 days ago · 10 km deep · 62 km away
  6. 2.5143 km SW of Adak, Alaska · 2690 days ago · 35 km deep · 93 km away
  7. 2.5223 km WSW of Adak, Alaska · 2688 days ago · 35 km deep · 94 km away
  8. 2.0136 km SW of Adak, Alaska · 2686 days ago · 17 km deep · 100 km away
  9. 3.2Andreanof Islands, Aleutian Islands, Alaska · 2679 days ago · 9 km deep · 72 km away
  10. 2.1166 km SW of Adak, Alaska · 2676 days ago · 37 km deep · 64 km away
  11. 2.5205 km WSW of Adak, Alaska · 2666 days ago · 24 km deep · 73 km away
  12. 2.1176 km WSW of Adak, Alaska · 2665 days ago · 27 km deep · 95 km away

Before

  1. 4.1142 km WSW of Adak, Alaska · 2725 days ago · 35 km deep · 97 km away
  2. 4.2204 km WSW of Adak, Alaska · 2727 days ago · 35 km deep · 78 km away
  3. 3.8231 km SW of Adak, Alaska · 2730 days ago · 10 km deep · 23 km away
  4. 3.9214 km SW of Adak, Alaska · 2730 days ago · 10 km deep · 37 km away
  5. 3.8220 km WSW of Adak, Alaska · 2736 days ago · 10 km deep · 72 km away
  6. 2.3Andreanof Islands, Aleutian Islands, Alaska · 2742 days ago · 26 km deep · 98 km away
  7. 3.7140 km SW of Adak, Alaska · 2745 days ago · 50 km deep · 93 km away
  8. 3.2220 km WSW of Adak, Alaska · 2748 days ago · 28 km deep · 68 km away
  9. 2.8141 km SW of Adak, Alaska · 2752 days ago · 35 km deep · 91 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event us700039sv (also filed as ak019529ben9). Read Sat, Oct 3, 2026, 9:15 AM UTC.