Mw 7.1 Southeast Indian Ridge
updated 31 May 2021 UTC

On 4 December 2015 a major earthquake occurred at the southeast Indian ridge. The seismic event occurred at 22:24:53 UTC and had an estimated moment magnitude (Mw) 7.1.

Two planetary alignments on 30 November and 1 December preceded the earthquake. On 29 November lunar geometry peaked 13 and remained relatively high on 2-3 December (index 12). A WPG peak occurred early on the 4th coinciding with a lunar peak reaching 11.

Earth-Sun-Saturn         2015-11-30,  0:18:42  247°14'16"
Sun-Mars-Jupiter         2015-12-01,  1:40:19  160°33'01"
SSGI chart
SSGI depiction of planetary (PG) and lunar (LG) geometry


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