Location: 7km N of Petrolia, CA Period: 20 Dec 2021 20:10:31 - 24 Dec 2021 23:37:01 (4 days 3 hours 26 minutes) Volcanoes in 100km radius: None Earthquakes: 113 3 swarms found nearby. 2002 S20020504.1(12.7km) 4 May 2 days 13 hours 44 earthquakes 2015 S20150129.1(5.8km) 28 Jan 20 hours 25 earthquakes 2024 S20241205.2(13.9km) 5 Dec 1 day 21 hours 108 earthquakes