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M6.9 earthquake, Costa Rica, 1999-08-20

MagnitudeM6.9mwc

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Depth20 km

Time (UTC)1999-08-20 10:02

Rank in 199921 / 135among M6+

Rank since 19001934 / 14,458

Energy vs an M6×22approx.

42 km S of Quepos, Costa Rica · 9.04, -84.16

M6.5+ within 300 km (largest first)

1991 M7.6M7.6

2012 M7.6M7.6

1939 M7.6M7.6

1934 M7.5M7.5

1950 M7.5M7.5

1941 M7.5M7.5

1990 M7.3M7.3

1904 M7.3M7.3

1904 M7.2M7.2

1900 M7.2M7.2

1962 M7.2M7.2

1916 M7.1M7.1

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.1 1997-04-01	1997-04-01 15:11	33 km	53 km SSW of Boca Chica, Panama
M6.2 1996-09-04	1996-09-04 19:06	32 km	13 km WSW of Quepos, Costa Rica
M6.0 1995-02-05	1995-02-05 20:37	12 km	137 km S of Punta de Burica, Panama
M6.3 1992-05-18	1992-05-18 23:19	18 km	86 km S of Boca Chica, Panama
M6.6 1992-03-07	1992-03-07 01:53	79 km	5 km SW of Río Segundo, Costa Rica
M6.2 1991-05-04	1991-05-04 03:42	10 km	16 km NE of Changuinola, Panama
M6.2 1991-04-24	1991-04-24 19:13	13 km	16 km SE of La Suiza, Costa Rica
M7.6 1991-04-22	1991-04-22 21:56	10 km	34 km S of Limón, Costa Rica
M6.3 1991-03-16	1991-03-16 06:02	33 km	15 km N of Nandayure, Costa Rica
M6.2 1991-03-01	1991-03-01 17:30	196 km	13 km SE of Los Chiles, Costa Rica

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.