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A preliminary magnitude-3.1 earthquake hit southern Los Angeles County on Thursday afternoon, with its epicenter near Compton. This follows another 3.2-magnitude quake in the same area overnight on September 6. The tremor was felt in several nearby cities including Long Beach and Downey. Over the weekend, dozens of small earthquakes, mostly under magnitude 2.0, were recorded throughout Southern California, with a significant cluster centered around South Los Angeles.
Written locally by qwen2.5:14b on 2026-09-18,
using this article's own text rather than the other coverage of the
same event (that is the story summary below).
Story summary
On September 7, a preliminary magnitude-3.1 earthquake struck southern Los Angeles County, with its epicenter about 2.5 miles southeast of Compton. This quake followed an earlier magnitude-3.2 tremor on September 6 in the same area. Thursday's event was felt as far away as Long Beach, Downey, and Paramount. Additionally, dozens of small earthquakes occurred over the weekend throughout southern California, with a cluster centered near South Los Angeles, including a magnitude-2.7 quake at Westmont around 2:30 am and another magnitude-2.6 temblor shortly after 4:30 pm in the same area. The USGS reported that offshore quakes struck southeast of Catalina Island early Saturday morning, alongside a separate magnitude-3.4 tremor near San Francisco Bay Area overnight on the same day. This activity underscores ongoing concerns about larger seismic events along notorious faults in Southern California.
Written for “Earthquake Hits Southern La County” on 2026-09-18,
grounded in this article and the 0 other(s) covering the same event.
The tremor struck at 1:32 p.m., with its epicenter about 2.5 miles southeast of Compton.
asserted
epicenter → strike → Compton
It comes after another 3.2-magnitude quake struck overnight on September 6 near the same city at eight miles below the surface.
asserted
quake → come → surface
Thursday’s earthquake was felt as far away as Long Beach, Downey and Paramount, according to the USGS.
uncertain
earthquake → feel → USGS
Dozens of small earthquakes rattled Southern California over the weekend, with a concentrated cluster in South Los Angeles.
asserted
Dozens → rattle → Angeles
According to the U.S. Geological Survey, more than 60 low-magnitude quakes were recorded throughout Saturday, the vast majority registering under magnitude 2.0.
uncertain
majority → accord → magnitude
The localized cluster included a magnitude 2.7 quake near Westmont at around 2:30 a.m., followed by a magnitude 2.6 temblor in the same area shortly after 4:30 p.m.
The regional seismic uptick extended beyond the LA Basin.
asserted
uptick → include → Basin
Offshore, a pair of earthquakes struck southeast of Catalina Island within minutes of each other just before 4:15 a.m. Overnight Saturday, a separate magnitude 3.4 earthquake shook parts of the San Francisco Bay Area.
asserted
earthquake → strike → Area
The relatively small tremor comes as Southern California remains under the shadow of some of the nation’s most notorious earthquake faults — and scientists continue to warn that a much larger quake could eventually strike the region.
uncertain
quake → come → region
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