Stresses imparted by the largest earthquakes known to have struck within 90 miles (150 kilometers) of the Ridgecrest epicenters. Areas of increased stress are shown in red-yellow. Stress “shadows” are in blue. Magnitude-4.0+ earthquakes from 1 Jan 1900 – 4 Jul 2019 (USGS ANSS catalog) are not a complete catalog, but the pattern is similar if we plotted magnitude-4.0+ since 1970, which is complete.