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M6.6 earthquake, southern Mid-Atlantic Ridge, 1928-11-22

MagnitudeM6.6mw

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Depth10 km

Time (UTC)1928-11-22 08:31

Rank in 192836 / 119among M6+

Rank since 19003858 / 14,458

Energy vs an M6×7approx.

southern Mid-Atlantic Ridge · -56.49, -3.98

M6.5+ within 300 km (largest first)

1995 M6.8M6.8

1971 M6.7M6.7

2021 M6.6M6.6

1928 M6.6M6.6

2007 M6.5M6.5

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.3 1925-03-07	1925-03-07 18:14	10 km	southern Mid-Atlantic Ridge

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.