Fig. 1: Ridgecrest earthquake sequence and b-values.
From: Were changes in stress state responsible for the 2019 Ridgecrest, California, earthquakes?
a Map of earthquakes in the Ridgecrest region. The cross-section in Fig. 2 extends from P1 to P2 and from P3 to P4 with a width of 8 km. Inset shows the study region (black rectangle). Thin lines indicate major mapped faults. Los Angeles, Santa Barbara, Ridgecrest, and Coso geothermal field are indicated as LA, SB, RC, and Coso GF, respectively. b Map of b-values obtained from seismicity (M ≥ 1) at a depth of 7-13 km before the M6.4 quake. Inset: the b-value map at a depth of 0–7 km. c Plot of b as a function of time before the M6.4 quake for seismicity (depth of 7–13 km) falling in the circle with a radius of r = 10 km (red) and 12 km (green), centered at the M6.4 epicenter. Moving windows cover 100 events. Also included is the magnitude-time dependence.
