Mw 7.5 South Georgia Island Region
updated 7 August 2021

On 19 August 2016 a major earthquake occurred in the South Georgia Island Region at a depth of 20 km. The seismic event occurred at 07:32:23 UTC and had an estimated moment magnitude (Mw) 7.5.

The earthquake occurred about four-and-a-half days after Earth lined up between Venus and Neptune and a Sun-Mercury-Saturn alignment. The alignments were followed by critical lunar geometry on the 15th and into the 16th peaking 17. Early on the 17th Earth made a Mercury-centric 90° angle with the Sun after which lunar geometry became critical again peaking 16 on the 18th and into the 19th, which is when the earthquake occurred. This major seismic event arrived late (but within the four-and-a-half-days limit) at the second lunar peak. In the second half of August 2016 no less than ten planetary alignments occurred, resulting in three magnitude 7 earthquakes peaking Mw 7.5. In addition, two strong earthquakes occurred with magnitude 6.8 and 6.7 respectively. Similarly critical was December 2016, which resulted in major seismic activity throughout the month.

Note: the earthquake occurred a day after Full Moon.

Venus-Earth-Neptune      2016-08-14, 16:45:39  340°54'08"
Sun-Mercury-Saturn       2016-08-14, 20:20:02  255°04'49"

Mercury: Sun-Earth       2016-08-17,  8:53:43   90°00'00"

Moon-Earth-Sun           2016-08-18,  9:01:00  145°37'08"
          
SSGI chart
SSGI depiction of planetary (PG) and lunar (LG) geometry

 

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