Southern California is no stranger to earthquakes, but tropical storms like Hilary are rare. It’s even rarer for a magnitude-5.1 earthquake near Ojai, Calif. to strike on the same Sunday afternoon (Aug. 20, 2023) that a tropical storm swept through Southern California. This uncommon confluence of events has sparked a heightened curiosity in the general public, including popular memes and the portmanteau “hurriquake.” But is there a physical connection between these events beyond mere coincidence in space and time? Zhigang Peng, professor in the School of Earth and Atmospheric Sciences, was part of a research team that studied available meteorological and seismic data to reveal that the quake near Ojai, Calif. was almost certainly not triggered by Hilary, which had been downgraded to a tropical storm at the time the earthquake struck.