Preliminary Seismic Yield Estimates of the July 1, 2025 Explosions near Esparto California

A series of large damaging explosions involving fireworks storage occurred near Esparto, Yolo County California on July 1, 2025.Three explosions were located and reported by the University of California Berkeley Seismology Laboratory (UCB/BSL) and the United States Geological Survey (USGS).Analysis of local distance (< 30 km) seismic recordings of the first blast indicates that there were actually three explosions with later blasts delayed by about 3 and 30 seconds.We measured the first arriving P-wave amplitudes on four of these events with good signal-to-noise ra