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M7.1 earthquake, Southwest Indian Ridge, 1933-01-21

MagnitudeM7.1mw

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Depth10 km

Time (UTC)1933-01-21 19:21

Rank in 19338 / 101among M6+

Rank since 19001057 / 14,458

Energy vs an M6×50approx.

Southwest Indian Ridge · -33.98, 57.68

M6.5+ within 300 km (largest first)

1951 M7.5M7.5

1933 M7.1M7.1

1925 M7.0M7.0

1926 M7.0M7.0

1925 M6.9M6.9

1925 M6.6M6.6

1974 M6.6M6.6

1949 M6.6M6.6

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.0 1933-01-17	1933-01-17 18:47	10 km	Southwest Indian Ridge
M6.2 1930-04-27	1930-04-27 14:26	10 km	South Indian Ocean
M6.2 1929-01-08	1929-01-08 07:23	10 km	South Indian Ocean
M6.3 1928-11-11	1928-11-11 22:41	10 km	Southwest Indian Ridge
M6.3 1928-03-27	1928-03-27 19:06	10 km	South Indian Ocean
M6.4 1928-01-30	1928-01-30 03:15	10 km	South Indian Ocean
M6.5 1927-11-08	1927-11-08 03:10	10 km	South Indian Ocean
M6.3 1927-04-16	1927-04-16 09:11	10 km	South Indian Ocean
M6.4 1927-03-21	1927-03-21 15:05	10 km	Southwest Indian Ridge
M6.1 1926-12-02	1926-12-02 08:13	10 km	South Indian Ocean

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.