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M7.6 earthquake, Costa Rica, 1939-12-21

MagnitudeM7.6mw

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Depth25 km

Time (UTC)1939-12-21 20:54

Rank in 19396 / 80among M6+

Rank since 1900403 / 14,458

Energy vs an M6×243approx.

4 km WNW of Atenas, Costa Rica · 9.99, -84.41

M6.5+ within 300 km (largest first)

1991 M7.6M7.6

2012 M7.6M7.6

1939 M7.6M7.6

1950 M7.5M7.5

1941 M7.5M7.5

1990 M7.3M7.3

1904 M7.3M7.3

1907 M7.3M7.3

1900 M7.2M7.2

1916 M7.1M7.1

1983 M7.1M7.1

1901 M7.1M7.1

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.0 1939-06-18	1939-06-18 16:46	15 km	6 km WNW of Tucurrique, Costa Rica
M6.1 1939-02-09	1939-02-09 15:30	15 km	near the coast of Nicaragua
M6.1 1937-06-24	1937-06-24 13:13	15 km	80 km SW of Golfito, Costa Rica
M6.4 1937-03-09	1937-03-09 15:40	20 km	14 km SE of Ciudad Cortés, Costa Rica
M6.1 1936-11-26	1936-11-26 02:12	15 km	37 km ENE of Pital, Costa Rica
M6.2 1935-08-01	1935-08-01 16:08	15 km	5 km S of Liberia, Costa Rica
M6.8 1934-07-21	1934-07-21 10:39	25 km	20 km SSE of Guarumal, Panama
M6.6 1934-07-18	1934-07-18 04:00	20 km	8 km SSW of Burica, Panama
M6.2 1933-11-23	1933-11-23 18:57	25 km	29 km W of Burica, Panama
M6.8 1932-10-02	1932-10-02 02:59	30 km	47 km S of Masachapa, Nicaragua

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.