Figure 4. Map showing ~1,000 earthquakes recorded by the Caltech/USGS Southern California Seismic Networks during the first couple of days of the 2021 Salton Sea event. This map includes smaller earthquakes than we presented in Table 1 above (magnitude thresholds of 1.3 and 2.5, respectively). The largest magnitude-5.3 earthquake is shown as a blue open circle. The focal mechanisms are determined with a moment tensor algorithm. Credit: Egill Hauksson, Caltech