Mw 7.1 Santiago del Estero Province, Argentina
updated 27 January 2022

On 14 August 1950 a major earthquake occurred in Santiago del Estero Province, Argentina at a depth of 610 km. The seismic event occurred at 22:51:26 UTC and had an estimated moment magnitude (Mw) 7.1.

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. This major earthquake was followed half a day later by a great earthquake in Assam-Tibet.

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