Mw 8.6 Crete, Greece
updated

On 21 July 365 a great earthquake occurred at the southwest coast of Crete, Greece. The seismic event occurred at sunrise and had an estimated moment magnitude (Mw) 8.6. Based on the amount of uplift of western Crete, the estimated minimum magnitude is 8.5. According to the Roman historian Ammianus Marcellinus the shaking started slightly after daybreak.

An analysis with Solpage shows that from 8 to 17 July 5 planetary alignments occurred, the last three of which included Earth, starting on the 11th. On the 21st lunar geometry reached 15 on the SSGI index, partially due to a Full Moon, which is when the earthquake occurred. Uranus and Neptune were on opposite sides of the Solar System, similar to 1905-1906.

Mercury-Sun-Mars          365-07-08,  7:44:32    2°49'27"
Venus-Mercury-Jupiter     365-07-08, 12:53:49  111°02'58"
Earth-Mercury-Uranus      365-07-11, 11:03:52  148°23'25"
Mercury-Earth-Neptune     365-07-14,  2:04:57  332°48'13"
Mars-Earth-Saturn         365-07-17,  3:07:44  233°43'24"

Moon-Earth-Sun             365-07-21, 10:48:08  141°01'53"
Moon-Earth-Uranus          365-07-22,  2:34:17  149°02'29"
Earth-Moon-Neptune         365-07-22,  9:35:37  332°35'07"

Earth:   Moon-Uranus       365-07-18, 11:31:06  135°00'00"
Earth:   Moon-Neptune      365-07-18, 18:46:17   45°00'00"
					
SSGI chart
SSGI depiction of planetary (PG) and lunar (LG) geometry

SSGI chart
earthquake epicentre map