A swarm of 90 low‑magnitude tremors struck the Lennox and Westmont neighborhoods of South Los Angeles on September 11 and 12, 2026. The quakes measured between magnitude 1.0 and 2.7, according to seismic monitoring data.
Residents in the two communities reported feeling the series of shakes over the two‑day period. The events occurred in rapid succession, creating a brief but noticeable burst of seismic activity across the area.
The pattern observed by scientists is classified as a micro‑quake swarm, a term used for clusters of small earthquakes that happen close together in time and space. Such swarms involve numerous tremors that are generally too weak to cause damage, but they can be felt by people nearby.
The Lennox and Westmont neighborhoods, located in the southern portion of Los Angeles, were the focal points of this particular swarm. While the magnitudes recorded were below the threshold typically associated with structural harm, the frequency of the events was unusual for the region.
Seismic networks captured each of the 90 quakes, providing a detailed record of the swarm’s magnitude range. The data will be reviewed by geologists to better understand the underlying causes of the brief burst of activity.
Overall, the event was confined to a short time frame and did not result in reported injuries or property damage. Authorities continue to monitor the area for any further seismic activity.
The occurrence adds to the ongoing catalog of minor seismic events that periodically affect Southern California, highlighting the importance of continuous monitoring in densely populated neighborhoods.