Montana earthquakes

M4.0 earthquake 18 km SSE of Harrison, Montana

A magnitude 4.0 earthquake struck 18 km SSE of Harrison, Montana on Tue, Jul 21, 1987, 11:23 PM MDT (05:23 UTC), 4 km (2 mi) below the surface.

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Map

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

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The earthquake

Magnitude
4.0 (mb), light
Local time
UTC
1987-07-22 05:23:06 UTC
Depth
3.8 km (2.4 mi), shallow
Epicenter
45.552° N, 111.680° W
Region
Montana
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

Nearest places

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

Nearby

Within 100 km, magnitude 1.5 and up: 34 in the 60 days after this one and 10 in the 30 days before it.

After

  1. 3.118 km SSE of Harrison, Montana · 14307 days ago · 4 km deep · 1 km away
  2. 2.615 km SSE of Harrison, Montana · 14307 days ago · 3 km deep · 3 km away
  3. 3.516 km SSE of Harrison, Montana · 14307 days ago · 7 km deep · 2 km away
  4. 3.118 km SSE of Harrison, Montana · 14307 days ago · 5 km deep · 1 km away
  5. 2.517 km SSE of Harrison, Montana · 14307 days ago · 3 km deep · 2 km away
  6. 3.117 km SSE of Harrison, Montana · 14307 days ago · 5 km deep · 1 km away
  7. 2.616 km SSE of Harrison, Montana · 14307 days ago · 5 km deep · 2 km away
  8. 2.616 km SSE of Harrison, Montana · 14307 days ago · 5 km deep · 2 km away
  9. 3.117 km SSE of Harrison, Montana · 14307 days ago · 4 km deep · 1 km away
  10. 2.717 km SSE of Harrison, Montana · 14307 days ago · 4 km deep · 1 km away
  11. 3.216 km SSE of Harrison, Montana · 14307 days ago · 4 km deep · 2 km away
  12. 3.217 km SSE of Harrison, Montana · 14307 days ago · 4 km deep · 2 km away
  13. 2.615 km SSE of Harrison, Montana · 14307 days ago · 8 km deep · 4 km away
  14. 3.319 km SSE of Harrison, Montana · 14306 days ago · 5 km deep · 1 km away
  15. 2.719 km SSE of Harrison, Montana · 14300 days ago · 4 km deep · 1 km away
  16. 3.018 km SSE of Harrison, Montana · 14299 days ago · 4 km deep · 1 km away
  17. 2.716 km SSE of Harrison, Montana · 14299 days ago · 3 km deep · 3 km away
  18. 2.719 km SSE of Harrison, Montana · 14298 days ago · 4 km deep · 1 km away
  19. 3.019 km SSE of Harrison, Montana · 14294 days ago · 3 km deep · 1 km away
  20. 3.119 km SSE of Harrison, Montana · 14294 days ago · 3 km deep · 2 km away
  21. 2.817 km SSE of Harrison, Montana · 14290 days ago · 3 km deep · 2 km away
  22. 2.017 km SSE of Harrison, Montana · 14289 days ago · 3 km deep · 2 km away
  23. 2.819 km SSE of Harrison, Montana · 14287 days ago · 4 km deep · 1 km away
  24. 2.817 km SSE of Harrison, Montana · 14286 days ago · 4 km deep · 1 km away
  25. 3.520 km SSE of Harrison, Montana · 14278 days ago · 5 km deep · 2 km away
  26. 3.011 km SSE of Harrison, Montana · 14278 days ago · 2 km deep · 7 km away
  27. 3.419 km SSE of Harrison, Montana · 14278 days ago · 6 km deep · 1 km away
  28. 2.718 km SSE of Harrison, Montana · 14277 days ago · 5 km deep · 1 km away
  29. 2.518 km SSE of Harrison, Montana · 14276 days ago · 5 km deep · 0 km away
  30. 2.919 km SSE of Harrison, Montana · 14274 days ago · 6 km deep · 1 km away
  31. 2.519 km SSE of Harrison, Montana · 14273 days ago · 6 km deep · 2 km away
  32. 2.116 km SSE of Harrison, Montana · 14270 days ago · 4 km deep · 2 km away
  33. 2.615 km SSE of Harrison, Montana · 14265 days ago · 4 km deep · 3 km away
  34. 2.617 km SSE of Harrison, Montana · 14260 days ago · 3 km deep · 3 km away

Before

  1. 3.018 km SSE of Harrison, Montana · 14307 days ago · 4 km deep · 0 km away
  2. 3.219 km SSE of Harrison, Montana · 14307 days ago · 6 km deep · 2 km away
  3. 2.817 km SSE of Harrison, Montana · 14307 days ago · 3 km deep · 2 km away
  4. 3.416 km SSE of Harrison, Montana · 14307 days ago · 2 km deep · 2 km away
  5. 3.618 km SSE of Harrison, Montana · 14307 days ago · 5 km deep · 1 km away
  6. 2.614 km SSE of Harrison, Montana · 14311 days ago · 8 km deep · 4 km away
  7. 2.714 km SSE of Harrison, Montana · 14312 days ago · 8 km deep · 4 km away
  8. 2.814 km SSE of Harrison, Montana · 14312 days ago · 6 km deep · 4 km away
  9. 3.416 km SSE of Harrison, Montana · 14314 days ago · 3 km deep · 2 km away
  10. 2.516 km SSE of Harrison, Montana · 14316 days ago · 3 km deep · 4 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event usp00036up. Read Tue, Sep 22, 2026, 4:59 AM UTC.