Mw 8.5-9.0 Iquique, Chile
updated 5 August 2021 UTC

On 10 May 1877 a great earthquake occurred at Iquique, Chile. The seismic event occurred at 00:59 UTC and had an estimated moment magnitude (Mw) 8.5 to 9.0.

As so often, the Mercury-Venus-Neptune alignment can cause large seismic activity, usually M 7.8 or larger. That was also the case with the great Iquique earthquake of 1877. About two days before the earthquake, Mercury, Venus and Neptune aligned. In addition, Venus aligned with the Sun and Earth a day earlier, which may have added to the great seismic energy release. At the time of the alignment on 8 May, the Moon made critical geometry with Saturn and Neptune, which resulted in a lunar peak with index 8. On the 9th the Moon made critical geometry with several planets, indicated by the high lunar peak with index 13.

Venus-Sun-Earth          1877-05-07,  0:53:09  228°15'46"
Mercury-Venus-Neptune    1877-05-08, 10:24:49   36°27'06"
SSGI chart
SSGI depiction of planetary (PG) and lunar (LG) geometry


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