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M7.0 earthquake, Costa Rica, 1978-08-23

MagnitudeM7.0ms

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Depth56 km

Time (UTC)1978-08-23 00:38

Rank in 197811 / 90among M6+

Rank since 19001476 / 14,458

Energy vs an M6×32approx.

19 km N of Nandayure, Costa Rica · 10.20, -85.22

M6.5+ within 300 km (largest first)

1992 M7.7M7.7

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

1916 M7.3M7.3

1900 M7.2M7.2

1916 M7.1M7.1

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.2 1974-02-28	1974-02-28 20:20	46 km	15 km SE of Quepos, Costa Rica
M6.5 1973-04-14	1973-04-14 08:34	33 km	26 km NNW of La Fortuna, Costa Rica
M6.3 1972-12-23	1972-12-23 06:29	10 km	10 km N of Managua, Nicaragua
M6.5 1970-08-12	1970-08-12 09:24	55 km	23 km WNW of Masachapa, Nicaragua
M6.6 1969-05-13	1969-05-13 14:16	40 km	34 km SSW of La Conquista, Nicaragua
M7.1 1967-10-15	1967-10-15 08:00	160 km	9 km E of Granada, Nicaragua
M6.2 1967-10-03	1967-10-03 18:16	29 km	24 km SW of La Cruz, Costa Rica
M6.0 1963-07-09	1963-07-09 09:24	35 km	20 km SSW of Golfito, Costa Rica
M6.4 1958-06-06	1958-06-06 09:11	35 km	188 km SW of Ciudad Cortés, Costa Rica
M6.3 1958-04-15	1958-04-15 03:52	25 km	138 km SW of Ciudad Cortés, 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.