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Southern California was jolted by a preliminary 4.3-magnitude earthquake on Thursday morning, originating near the Fontana and Rialto areas in San Bernardino County. As reported by the United States Geological Survey, the quake occurred at approximately 9:32 a.m. Pacific time in the Muscoy area, at a depth of just over three miles. This seismic event was part of a series of quakes, as the region had already experienced smaller tremors, including a magnitude 3.0 and a 2.8 quake, earlier the same morning.
Shaking from the earthquake was felt across various parts of Southern California, reaching Inland Empire communities such as Jurupa Valley, Eastvale, and Ontario, and extending to locations as distant as Redondo Beach. Numerous residents described the sensation as a jolt or a rolling movement. Among them, individuals in high-rise buildings experienced notable shaking, including Gregory Christison in Garden Grove who felt a rolling sensation on the 7th floor, and Cindy Hecht Sedbrook who experienced the quake on the 11th floor in Irvine.
Despite the widespread shaking, there were no immediate reports of damage or injuries, illustrating the earthquake's light intensity as per U.S. Geological Survey data. The agency records show that the quake struck about four miles west of Muscoy, California, which is situated roughly 50 miles east of Los Angeles. Subsequent aftershocks, including a magnitude-3.1 temblor, followed shortly after the initial quake, continuing to impact the same region.
Beyond the Muscoy area, individuals across the Los Angeles metropolitan region reported feeling the earthquake. This includes reports from Riverside, San Bernardino, Long Beach, Pasadena, and several other areas within the vicinity. The USGS Interactive Map indicated that people felt the tremors as far north as Bakersfield and as far south as Santa Ysabel, demonstrating the earthquake's broad reach.
The quakes occurred in an area known as the "Fontana trend," which seismologists note as prone to cluster-like seismic activity. Since 1990, this region has experienced numerous quakes, with a significant number of magnitude-3.0 and greater events recorded. The recent activity fits within a notable seismic trend, yet no clear indication of injuries or structural damage has emerged.
As the situation develops, additional data may lead to revisions in the recorded magnitude or updates to shake-severity maps developed by USGS scientists. Currently, the quake's impact on infrastructure and safety conditions remains minimal, underscoring the necessity for local residents to remain prepared for more significant seismic events.
Scientists emphasize the importance of earthquake preparedness, advising locals to maintain readiness plans and kits to mitigate risks during such events. Southern California residents are encouraged to review safety measures and protocols, ensuring resilience against potential future quakes. As new information becomes available, further updates will enhance understanding and response strategies surrounding seismic activities in the region.

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