Location: 3km NNW of Palomar Observatory, CA Period: 22 Dec 2021 15:29:17 - 23 Dec 2021 17:16:17 (1 day 1 hour 47 minutes) Volcanoes in 100km radius: None Earthquakes: 46 4 swarms found nearby. 2019 S20190328.1(14.7km) 27 Mar 5 days 20 hours 79 earthquakes S20190905.1(3.7km) 4 Sep 4 days 3 hours 56 earthquakes 2021 S20211231.1(0.6km) 30 Dec 4 days 1 hours 63 earthquakes 2022 S20220109.1(0.3km) 8 Jan 18 hours 37 earthquakes