Mw 7.9 Gulf of Alaska
updated 28 August 2021

On 23 January 2018 a major earthquake occurred in the Gulf of Alaska at a depth of 30 km. The seismic event occurred at 09:31:44 UTC and had an estimated moment magnitude (Mw) 7.9.

Three days before the earthquake, the critical Mercury-Venus-Neptune alignment occurred, which has the potential to cause high 7 to 8 magnitude earthquakes. It was the only critical planetary geometry while lunar geometry was not too critical throughout the week. But the Moon did lined up with Neptune hours after the planetary alignment.

Mercury-Venus-Neptune     2018-01-20,  2:21:54  344°17'37"

Earth-Moon-Neptune        2018-01-20, 20:20:02  342°10'45"
SSGI chart
SSGI depiction of planetary (PG) and lunar (LG) geometry


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