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At least four events were recorded in the Ferndale area, with high activity also observed around the town of Petrolia, where at least 10 quakes ranging from 3.1 to 4.2 magnitude broke out.
They were preceded by a pair of earthquakes in early June — a magnitude 3.4 on June 2 and a magnitude 2.8 on June 4 — as well as a magnitude 2.9 earthquake in the same area June 24.
Earthquakes are common on the West Coast, with multiple plate boundaries like the San Andreas fault making geologic activity more likely. They are rarer on the East Coast, but they do happen .
Between 1964 and 1994, Los Angeles faced two big earthquakes, which both hit the suburban San Fernando Valley hard: the magnitude 6.6 Sylmar earthquake of 1971, which resulted in 64 deaths; and ...
The seismic activity of an area is the frequency, type, and size of earthquakes experienced over a particular time. The seismicity at a particular location in the Earth is the average rate of seismic energy release per unit volume. In its most general sense, the word earthquake is used
Saturday's earthquake was the seventh of magnitude 3 or greater since Sept. 12, when a magnitude 4.7 earthquake just north of Malibu was widely felt across Southern California.
Earthquake magnitudes are based on data from the USGS. Seismic activity during the year 2024 was much lower than the rest of the 21st century, with only 100 earthquakes exceeding magnitude six, the lowest since 1982. [1] There were also no earthquakes exceeding ≥M8 for the third year in a row.
It was the deadliest earthquake in the immediate area since a M s 6.6 event occurred in Yadong County on 20 November 1980. That earthquake had an epicenter 176 km (109 mi) away and killed 3 people in the county. The 7 January 2025 earthquake was also the largest in the area since a M s 7.1 struck 171 km (106 mi) to the south on 26 April 2015.