Mw 6.0 Ryukyu Islands, Japan
updated 10 December 2021

On 9 December 2021 a strong earthquake occurred at the Ryukyu Islands, Japan at a depth of 15 km. The seismic event occurred at 02:05:08 UTC and had an estimated moment magnitude (Mw) 6.0.

Seismic activity up to low 6 magnitude was anticipated due to the Moon's alignment with Venus early on the 7th.

Earth-Moon-Venus          2021-12-07,  1:01:08  293°18'39"
Earth-Moon-Saturn         2021-12-08,  3:22:20  309°15'40"
Earth-Moon-Jupiter        2021-12-09,  8:29:30  326°16'48"
SSGI chart
SSGI depiction of planetary (PG) and lunar (LG) geometry

atmospheric electricity
atmospheric electricity before and during the earthquake