Researchers identified 22,698 earthquakes in the Cahuilla swarm in Southern California, which lasted nearly four years.
Notes on verification
Multiple independent outlets (Caltech, ScienceNews, ScienceDaily, Phys.org, National Geographic) corroborate the ~22,000+ earthquake count and roughly four-year duration; the exact 22,698 figure matches secondary reporting derived from the primary study.
Sources
- A strange earthquake swarm lasted for years. Scientists finally know ... (nationalgeographic.com)
- https://www.sciencenews.org/article/machine-learning-california-earthquake-swarm (sciencenews.org)
- https://www.caltech.edu/about/news/natural-fluid-injections-triggered-cahuilla-earthquake-swarm (caltech.edu)
- https://strangesounds.org/2020/07/cahuilla-earthquake-swarm-south-california-mystery.html (strangesounds.org)