Information For a 3.5 Earthquake on 08/20/1987 near Harrison, MT

An earthquake of magnitude 3.5 and depth of 5.40 kilometers occurred 12.74 miles from Harrison, MT in Madison County at 05:39 AM.

08/20/1987 - Earthquake Incident Location
Earthquake Details
Location: 12.74 miles from Harrison, MT in Madison County, MT
Date: 08/20/1987
Time: 05:39 AM
Magnitude: 3.5 Mag
Depth: 5.40 km
More Earthquake Incidents on 08/20/1987

Area Highlights

Natural Disasters Risk

  • Hail Risk Hail Risk is Very Low
  • Tornados Tornado Risk is Very Low
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