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M6.9 earthquake, South Sandwich Islands, 1921-09-13

MagnitudeM6.9mw

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Depth35 km

Time (UTC)1921-09-13 02:37

Rank in 192110 / 61among M6+

Rank since 19001767 / 14,458

Energy vs an M6×23approx.

South Sandwich Islands region · -55.62, -28.66

M6.5+ within 300 km (largest first)

1929 M8.1M8.1

1964 M7.8M7.8

2016 M7.4M7.4

1991 M7.2M7.2

2016 M7.2M7.2

1961 M7.1M7.1

1930 M6.9M6.9

1921 M6.9M6.9

2004 M6.9M6.9

2014 M6.9M6.9

1943 M6.8M6.8

1963 M6.8M6.8

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.