A sudden and unexplained spike in seismometer activity over Los Angeles on April 2, 2024, has puzzled scientists. Initially, an earthquake was suspected as the cause, but data revealed a distinct anomaly. The signals did not correspond to any fault line activity and moved at a faster pace than expected earthquakes. Further investigation led to the discovery of a bright fireball, later confirmed as a piece of space junk burning up in the atmosphere.
Source: https://www.washingtonpost.com/climate-environment/2025/01/30/falling-space-debris-seismometers