On 14 April 1906 a major earthquake occurred southeast of Loyalty Islands at a depth of 35 km. The seismic event occurred at 03:57:36 UTC and had an estimated moment magnitude (Mw) 7.1
The estimated primary trigger of this seismic event is critical lunar geometry with Uranus and Neptune on 8 and 11 April.
In 1906 Uranus and Neptune were on opposite sides of the Solar System. This resulted several times in (near) conjunctions with Earth as well as critical lunar geometry with both outer planets. This type of lunar geometry with outer planets is associated with major to great earthquakes and several of them occurred in 1905 and 1906 following this geometry. In 1906 alone 22 earthquakes occurred with magnitude 7 and larger, seven of which with magnitude 7.8 and larger and five with magnitude 8.
On 8 April 1906 opposing lunar right angles with Uranus and Neptune occurred, followed by lunar semi-right angles with the same planets. Similar geometry preceded the major earthquake in California four days later. Critical lunar conjunctions occurred on 11-12 April with Mars and Jupiter.
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Sun: Mercury-Saturn 1906-04-07, 6:56:54 135°00'00" Venus: Earth-Mars 1906-04-08, 23:18:29 135°00'00" Mercury: Earth-Mars 1906-04-09, 1:38:26 135°00'00" Sun: Venus-Uranus 1906-04-09, 5:36:34 135°00'00" Sun: Mercury-Jupiter 1906-04-09, 7:14:54 135°00'00" Venus: Earth-Jupiter 1906-04-09, 8:45:46 135°00'00" Sun: Venus-Neptune 1906-04-11, 18:17:11 45°00'00" Venus: Mercury-Uranus 1906-04-12, 12:53:04 45°00'00" Mercury: Earth-Neptune 1906-04-13, 4:23:15 90°00'00" Mercury: Venus-Uranus 1906-04-13, 16:23:35 135°00'00" Mercury: Venus-Earth 1906-04-14, 11:24:34 135°00'00" Mercury: Venus-Neptune 1906-04-14, 18:09:14 45°00'00" Venus: Mercury-Neptune 1906-04-15, 12:21:48 135°00'00" Sun: Mercury-Uranus 1906-04-16, 15:47:09 45°00'00" Moon-Earth-Mercury 1906-04-08, 21:06:18 12°53'47" Moon-Earth-Sun 1906-04-09, 8:16:14 19°53'09" Moon-Earth-Venus 1906-04-10, 7:26:17 34°29'11" Moon-Earth-Mars 1906-04-11, 6:36:39 49°05'41" Moon-Earth-Jupiter 1906-04-12, 11:28:32 67°04'26" Moon-Earth-Neptune 1906-04-14, 16:56:59 99°06'39" Earth-Moon-Uranus 1906-04-14, 18:08:36 279°48'12" Earth: Moon-Mars 1906-04-08, 3:18:21 135°00'00" Earth: Moon-Neptune 1906-04-08, 14:53:49 90°00'00" Earth: Moon-Uranus 1906-04-08, 16:07:27 90°00'00" Earth: Moon-Jupiter 1906-04-09, 10:48:38 135°00'00" Earth: Moon-Saturn 1906-04-09, 19:18:50 135°00'00" Earth: Moon-Neptune 1906-04-11, 14:32:32 135°00'00" Earth: Moon-Uranus 1906-04-11, 15:43:00 45°00'00" Earth: Moon-Jupiter 1906-04-15, 16:43:35 135°00'00" Earth: Moon-Saturn 1906-04-16, 1:11:41 45°00'00"