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Mw 9.5 Valdivia, Chile
updated 28 May 2021 UTC

On 22 May 1960 a mega-thrust earthquake occurred at Valdivia, Chile. The seismic event occurred at 19:11:20 UTC and had an estimated moment magnitude (Mw) 9.5. It is the largest earthquake on record since recording began in 1901.

Starting on the 17th four planetary alignments preceded the earthquake, most notably Venus-Sun-Neptune on the 20th and Mars-Mercury-Uranus on the 21st. In addition, two WPG peaks occurred on the 20th right before a lunar peak that reached 12 on the geometry index and another WPG peak on the 22nd. Five strong to major foreshocks preceded the main seismic event, Mw 8.1, Mw 6.2, Mw 7.1, Mw 6.8, Mw 7.8, the first four in Bio-Bio and the fifth in Araucania.

Mercury-Sun-Earth        1960-05-17, 15:04:11  237°15'07"
Venus-Sun-Neptune        1960-05-20, 12:29:24  218°27'30"
Mars-Mercury-Uranus      1960-05-21, 15:05:56  141°42'49"
Mercury-Sun-Jupiter      1960-05-22,  8:32:19  266°57'27"
SSGI chart
SSGI depiction of planetary (PG) and lunar (LG) geometry


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