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M6.6 earthquake, Montana Earthquake, 1925-06-28

MagnitudeM6.6mw

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Depth–

Time (UTC)1925-06-28 01:21

Rank in 192532 / 106among M6+

Rank since 19003401 / 14,458

Energy vs an M6×8approx.

The 1925 Clarkston Valley, Montana Earthquake · 46.08, -111.51

M6.5+ within 300 km (largest first)

1959 M7.2M7.2

1983 M6.9M6.9

1925 M6.6M6.6

1959 M6.5M6.5

Energy ratio uses the rule that one magnitude unit is about 32 times the energy. Magnitudes and locations are USGS values and can differ from national agencies. Older records are less complete and less precise.