On 20 October 2015 a major earthquake occurred at Vanuatu at a depth of 147 km. The seismic event occurred at 21:52:03 UTC and had an estimated moment magnitude (Mw) 7.1.
The estimated primary trigger of this seismic event is critical lunar geometry on 16 and 20 October 2015.
In October 2015 Earth moved between Venus and Neptune, which resulted in a tight convergence of critical lunar geometry with both planets. The planetary conjunction Venus-Earth-Neptune was exact on the 17th. On 16 October opposite right-angle lunar geometry occurred with Venus and Neptune within 20 minutes. On 20 October semi-right angle lunar geometry occurred with both planets again. A notable planetary conjunction occurred on the 19th with Venus, the Sun and Saturn.
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Venus-Mars-Jupiter 2015-10-14, 05:58:07 0°00'00" Venus-Earth-Neptune 2015-10-17, 02:43:52 0°00'00" Earth-Mars-Jupiter 2015-10-17, 22:34:56 0°00'00" Venus-Sun-Saturn 2015-10-19, 17:55:51 0°00'00" Sun: Earth-Saturn 2015-10-14, 17:22:16 135°00'00" Venus: Earth-Saturn 2015-10-15, 05:15:46 90°00'00" Sun: Mercury-Mars 2015-10-15, 14:35:08 45°00'00" Sun: Earth-Jupiter 2015-10-15, 21:41:59 135°00'00" Sun: Earth-Neptune 2015-10-17, 09:01:34 45°00'00" Sun: Mercury-Venus 2015-10-17, 14:30:08 45°00'00" Sun: Mercury-Uranus 2015-10-17, 17:40:49 90°00'00" Sun: Venus-Uranus 2015-10-18, 02:33:45 45°00'00" Sun: Mercury-Saturn 2015-10-18, 03:59:14 135°00'00" Sun: Mercury-Jupiter 2015-10-18, 09:00:24 45°00'00" Sun: Mercury-Neptune 2015-10-18, 14:07:58 135°00'00" Sun: Mercury-Earth 2015-10-18, 19:55:29 90°00'00" Sun: Venus-Jupiter 2015-10-20, 14:30:24 90°00'00" Sun: Venus-Neptune 2015-10-21, 07:14:02 90°00'00" Mercury: Earth-Mars 2015-10-21, 11:23:49 135°00'00" Earth: Saturn-Uranus 2015-10-22, 14:07:45 135°00'00" Earth-Moon-Saturn 2015-10-16, 13:36:22 0°00'00" Earth: Moon-Neptune 2015-10-13, 05:46:16 135°00'00" Earth: Moon-Mars 2015-10-13, 14:08:17 45°00'00" Earth: Moon-Jupiter 2015-10-13, 17:55:59 45°00'00" Earth: Moon-Mercury 2015-10-15, 10:37:01 45°00'00" Earth: Moon-Uranus 2015-10-16, 15:16:34 135°00'00" Earth: Moon-Venus 2015-10-16, 22:43:42 90°00'00" Earth: Moon-Neptune 2015-10-16, 23:01:47 90°00'00" Earth: Moon-Sun 2015-10-17, 01:03:05 45°00'00" Earth: Moon-Mars 2015-10-17, 11:47:45 90°00'00" Earth: Moon-Jupiter 2015-10-17, 12:10:11 90°00'00" Earth: Moon-Mercury 2015-10-19, 09:38:10 90°00'00" Earth: Moon-Saturn 2015-10-20, 03:14:07 45°00'00" Earth: Moon-Uranus 2015-10-20, 03:52:27 90°00'00" Earth: Moon-Neptune 2015-10-20, 11:14:32 45°00'00" Earth: Moon-Venus 2015-10-20, 17:23:56 135°00'00" Earth: Moon-Sun 2015-10-20, 19:57:39 90°00'00" Earth: Moon-Jupiter 2015-10-21, 00:42:10 135°00'00" Earth: Moon-Mars 2015-10-21, 03:09:23 135°00'00"