Petrolia is located near the Mendocino Triple Junction , where three fault lines meet , and experiences frequent earthquake activity . The last large earthquake to affect the area was a magnitude 7.1 earthquake in 1992 , which resulted in a fire that destroyed the Petrolia General Store . The store was rebuilt but lacks the charm of the 100-year-old landmark that it replaced . Two remaining landmarks in Petrolia are a small wooden church and the Petrolia Pioneer Cemetery , which has the graves of original residents of Petrolia dating from November 1857
earthquake in 1992
1992 Cape Mendocino earthquakes
Petrolia, California