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M6.9 earthquake, Argentina, 1971-02-21

MagnitudeM6.9mw

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Depth189 km

Time (UTC)1971-02-21 10:35

Rank in 197121 / 143among M6+

Rank since 19002091 / 14,458

Energy vs an M6×20approx.

99 km WNW of San Antonio de los Cobres, Argentina · -23.78, -67.18

M6.5+ within 300 km (largest first)

1950 M8.2M8.2

2024 M7.4M7.4

2000 M7.2M7.2

1997 M7.1M7.1

1942 M7.1M7.1

1987 M7.0M7.0

1993 M7.0M7.0

2026 M6.9M6.9

1948 M6.9M6.9

1971 M6.9M6.9

1916 M6.8M6.8

1962 M6.8M6.8

Earlier M6+ within 300 km

Event	Time (UTC)	Depth	Place
M6.5 1970-12-04	1970-12-04 17:08	45 km	45 km ESE of Mejillones, Chile
M6.6 1970-06-11	1970-06-11 06:02	112 km	176 km S of San Pedro de Atacama, Chile
M6.7 1967-12-27	1967-12-27 09:17	115 km	136 km NNE of Calama, Chile
M6.8 1962-08-03	1962-08-03 08:56	125 km	40 km SE of San Pedro de Atacama, Chile
M6.6 1959-05-12	1959-05-12 09:46	25 km	47 km ENE of Humahuaca, Argentina
M8.2 1950-12-09	1950-12-09 21:38	114 km	121 km SSE of San Pedro de Atacama, Chile
M6.9 1948-08-25	1948-08-25 06:09	30 km	30 km SSE of Santa Clara, Argentina
M6.1 1946-05-10	1946-05-10 23:32	65 km	144 km ENE of Taltal, Chile
M7.1 1942-07-08	1942-07-08 06:55	35 km	87 km SSE of Antofagasta, Chile
M6.1 1930-12-24	1930-12-24 06:02	15 km	7 km ESE of El Carril, Argentina

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.