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M6.6 earthquake, Mid-Indian Ridge, 1954-10-21

MagnitudeM6.6mw

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Depth15 km

Time (UTC)1954-10-21 00:10

Rank in 195427 / 109among M6+

Rank since 19003839 / 14,458

Energy vs an M6×8approx.

Mid-Indian Ridge · -41.12, 80.18

M6.5+ within 300 km (largest first)

1954 M6.6M6.6

1975 M6.5M6.5

1997 M6.5M6.5

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.3 1951-05-02	1951-05-02 16:17	15 km	Mid-Indian Ridge
M6.2 1945-04-18	1945-04-18 13:04	10 km	Mid-Indian Ridge
M6.4 1928-05-31	1928-05-31 23:24	10 km	Mid-Indian Ridge
M6.1 1927-10-16	1927-10-16 12:21	10 km	Mid-Indian Ridge
M6.3 1924-12-11	1924-12-11 17:28	10 km	Mid-Indian 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.