Mw 8.6 Eastern Xizang-India border region
updated 27 January 2022

On 15 August 1950 a great earthquake occurred in Eastern Xizang-India border region (Assam, Tibet) at a depth of 15 km. The seismic event occurred at 14:09:34 UTC and had an estimated moment magnitude (Mw) 8.6.

On 14-15 August 1950 seismic activity peaked as a result of critical planetary and lunar geometry converging on both days. The Venus-Mercury-Mars alignment on the 14th was followed a day later by Earth-Mercury-Saturn. While the New Moon occurred on the 13th, more crucial was the Moon's alignment with Jupiter and Saturn on the 14th and 15th respectively. A major earthquake already occurred later on the 14th in Argentina.

#Assam, #Tibet, #Shillong, #Himalaya

Venus-Mercury-Mars        1950-08-14, 15:18:14  256°35'03"
Earth-Mercury-Saturn      1950-08-15, 13:53:46  169°31'51"

Earth-Moon-Sun            1950-08-13, 18:06:10  141°06'04"
Moon-Earth-Jupiter        1950-08-14, 18:14:14  334°39'59"
Earth-Moon-Saturn         1950-08-15, 20:18:26  169°33'43"
Earth-Moon-Mercury        1950-08-15, 20:50:52  169°52'23"
SSGI chart
SSGI depiction of planetary (PG) and lunar (LG) geometry

SSGI chart
SSGI categorized sum of basic critical geometry