Dozens of small earthquakes struck South Los Angeles in hours, concentrating along the Newport–Inglewood Fault and putting the city on alert for what could come next.
Story Highlights
- United States Geological Survey data and local reports logged a dense burst of quakes in South Los Angeles.
- Los Angeles Times counted about 90 micro‑earthquakes between magnitude 1.0 and 2.7 near Lennox and Westmont.
- Scientists describe this pattern as an earthquake “swarm,” which is common and usually not damaging.
- Officials urge simple steps now: secure heavy items, refresh go‑bags, and review ShakeAlert on phones.
What Happened: A Concentrated Burst Under South Los Angeles
Local newsrooms and seismic feeds reported a rapid series of small quakes hitting South Los Angeles from Friday night into Saturday. Reported magnitudes ranged mostly from 1.0 to 2.7, with several felt in Lennox, Westmont, and near Inglewood. The Los Angeles Times said about 90 micro‑earthquakes clustered along the Newport–Inglewood Fault during this period, based on United States Geological Survey data. A separate local outlet noted six quakes of 2.5 or higher in the broader region during the same window.
United States Geological Survey tools and third‑party trackers showed the cluster within a tight area near the fault, plus scattered small events across Southern California. A Sacramento Bee update highlighted a 2.6 magnitude quake near Inglewood around 4:32 a.m. Saturday, with a depth near 12 miles. A listing service that compiles official records logged several magnitude 2 events on September 12 in the greater Los Angeles area, consistent with the local shake reports.
How Scientists Classify Swarms And Why This Matters
United States Geological Survey guidance explains that an earthquake “swarm” is a sequence of many small quakes in one area without a single large mainshock setting the pattern. That differs from a typical big‑quake followed by aftershocks. Research notes that swarms are often made of small events and can occur in tectonic zones like Southern California without causing damage. Scientists say labels vary by catalog cutoffs and time windows, which is why counts can differ across outlets.
The Newport–Inglewood Fault has produced damaging earthquakes in the past, but small swarms on active faults are common and expected. United States Geological Survey materials stress that most swarms do not lead to a larger event. Still, each burst reminds residents that the system is active, and that basic readiness reduces risk when a stronger quake eventually hits. The focus now is on verifying locations, tracking the rate of events, and watching for any unusual change in magnitude distribution.
Public Impact: What Residents Felt And What To Do Next
Residents reported brief jolts, rattling windows, and pets reacting, mainly in South Los Angeles. No major damage or injuries were reported in the early accounts cited by local outlets. A television station tallied more than 80 small quakes in the region over the period, underscoring how people can feel even minor events when they cluster near homes and workplaces. Shake intensity depends on distance to the epicenter, soil conditions, and building type, so experiences varied block by block.
We have an earthquake swarm currently in process in the Los Angeles Basin. No major quakes yet, but over 100 minor ones in that large cluster. Consider how the massive erosion that struck many SoCal beaches transported tons of sand to new locations and altered mass distribution. pic.twitter.com/kzHx4TQ6LF
— Stefan Burns (@StefanBurnsGeo) September 13, 2026
Preparedness remains the part people control. Officials and safety groups advise simple steps. First, secure tall furniture, water heaters, and heavy wall items. Second, refresh go‑bags with water, food, medicine, flashlights, and chargers. Third, review workplace and school drop‑cover‑hold drills. Fourth, enable wireless alerts and the ShakeAlert system on smartphones. These steps protect families on both good days and bad ones, and they cut the odds that a routine swarm becomes a preventable tragedy.
Systemic Gaps: Why Small Quakes Expose Big Weaknesses
City and state agencies have expanded alert systems and retrofit programs, yet progress often lags behind risk. Many older homes and small businesses still wait for retrofits they cannot afford. Insurance costs climb while coverage shrinks. Working families on tight budgets face hard choices between safety upgrades and monthly bills. These gaps feed a broader frustration that leaders talk safety but fund it slowly, leaving everyday people to shoulder the risk when the ground moves again.
Sources:
nypost.com, latimes.com, earthquaketracker.org, earthquake.usgs.gov, scedc.caltech.edu, scienceinsights.org, en.wikipedia.org
