Mw 6.6 Sulawesi, Indonesia
updated 21 August 2021

On 29 May 2017 a strong earthquake occurred in Sulawesi, Indonesia at a depth of 12 km. The seismic event occurred at 14:35:23 UTC and had an estimated moment magnitude (Mw) 6.6.

The Mars-Earth-Saturn alignment, which is known to cause mid to higher 6 magnitude earthquakes, occurred hours before the earthquake in Sulawesi, Indonesia. The earthquake came early, which is likely due to the fact that the Moon lined up with both planets two days earlier. This earthquake was the first strong tremor (M6>) in almost two weeks.

Earth-Moon-Mars           2017-05-27,  1:47:56   84°01'39"
Moon-Earth-Saturn         2017-05-27,  4:20:26  265°38'17"

Mars-Earth-Saturn         2017-05-29,  6:28:57  265°29'48"
          
SSGI chart
SSGI depiction of planetary (PG) and lunar (LG) geometry

 

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