Mw 7.9 Northern California

updated 18 April 2025

report

On 18 April 1906 a major earthquake occurred at San Francisco, Northern California at a depth of 12km. The seismic event occurred at 13:12:26 UTC and had an estimated moment magnitude (Mw) 7.9.

The estimated primary trigger of this seismic event is a convergence of planetary and lunar geometry from 12 to 15 april 1906.

From 12 to 15 April Mercury and Venus made pairs of semi-right angle geometry (45°, 135°) with both Uranus and Neptune. This is a rare cluster of critical geometry and it occurred because Uranus and Neptune were on opposite sides of the Solar System, with Earth passing in-between in April 1906, which resulted in similar critical lunar geometry on 11 and 18 April. Lunar conjunctions with Uranus and Neptune converged on 14 April.

In 1905 and especially 1906 Earth moved close to the Uranus-Neptune line, which resulted in critical lunar geometry with both planets each time. To date 1906 is seismically still the most active year on record with no less than 22 magnitude ≥ 7.0 and 7 magnitude ≥ 7.8 earthquakes, 5(!) of which reached magnitude ≥ 8. The largest earthquake measured magnitude 8.8 on 31 January near the coast of Ecuador. A similar sized earthquake did not occur until 1952.

#MoonUranus #MoonNeptune #mvsra #mvra #olra #lsra #olcj


SSGI

SSGI chart
SSGI COMMON graph of critical planetary (PG) and lunar (LG) geometry

SSGI chart
SSGI SUM graph of critical planetary (PG) geometry

geometry

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: 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"
Venus:   Mercury-Saturn   1906-04-19,  1:28:11   90°00'00"
Sun:     Venus-Saturn     1906-04-19, 13:24:16   90°00'00"

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-Saturn         1906-04-19, 13:49:12  342°48'43"

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-Mars        1906-04-14, 12:15:37  135°00'00"
Earth:   Moon-Mars        1906-04-18,  1:43:45   90°00'00"
Earth:   Moon-Neptune     1906-04-18,  2:14:49  135°00'00"
Earth:   Moon-Uranus      1906-04-18,  3:26:09   45°00'00"
  					

OK
This website is using cookies. Terms and conditions, Privacy Policy