This is the chart of the earthquake of January 9, 1857 in LA (Fort Tejon). Mars is exactly square Midheaven, just after Moon conjunct Saturn. Neptune is exactly square Orcus. There was a lot of damage, but only 2 fatalities, because most of the area was inhabited at the time. Many rivers were 'thrown out of their beds'. !I had to use the LA latitude/longitude so there may be a slight difference in the degrees of Ascendant and Midheaven!
This site is using the sidereal zodiac!