Mw 6.2 Northern Sumatra, Indonesia

updated 19 January 2023


On 15 January 2023 a strong earthquake occurred at Northern Sumatra, Indonesia at a depth of 40 km. The seismic event occurred at 22:30:00 UTC and had an estimated moment magnitude (Mw) 6.2.

The estimated primary trigger of this seismic event is a lunar conjunction with Jupiter on 13 January.

On 13 January a lunar conjunction occurred with Jupiter, which often results in (some) increased seismic activity in the following days. In addition, the planetary conjunction Mercury-Sun-Saturn occurred on 14 January, which may have had some effect. A second strong earthquake occurred at the Izu Islands south of Japan a day later.

#MoonNeptune #MoonJupiter


SSGI chart
SSGI COMMON graph of critical planetary (PG) and lunar (LG) geometry

SSGI chart
SSGI SUM graph of critical planetary (PG) geometry



Mercury-Venus-Saturn      2023-01-10,  7:30:43  325°31'51"
Mercury-Sun-Saturn        2023-01-14, 14:38:31  326°22'55"

Moon-Earth-Venus          2023-01-08, 16:09:40  306°40'49"
Moon-Earth-Saturn         2023-01-10,  1:13:56  323°02'39"
Moon-Earth-Neptune        2023-01-12, 12:41:35  352°46'26"
Moon-Earth-Jupiter        2023-01-13,  7:52:57    2°33'28"
Moon-Earth-Uranus         2023-01-16, 14:33:20   44°38'17"

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