This page summarizes earthquakes in Riverside County (United States). The most recently recorded event was a magnitude M0.7 earthquake near Moonlight Rim on 2026-07-31 02:01:28 UTC. All event lists and map markers are limited to the last 30 days.
Riverside County is located in the U.S. state of California. As of the 2020 census, its population was 2,418,185, making it the fourth-most populous county in California and the 10th-most populous in the United States.
In 2026, Riverside County recorded 1999 earthquakes within United States. The average magnitude was M1.08. The strongest event reached M4.9.
Based on the number of recorded earthquakes in 2026, Riverside County is currently among the Top 5 most active regions in United States (rank #2 by count).
Located on the Pacific Plate.
