Figure 1. Aftershocks of the mainshock reveal rupture on the Mendocino Fault, which connects to the San Andreas and Cascadia megathrust at the tectonic triple junction. The earthquake epicenters were obtained from the USGS catalog at 9:00 a.m. Pacific time on Dec. 7. The inset includes red stars locating the magnitude 7 epicenter and the magnitude 5.8 Yerington earthquake that struck Nevada several days later. Credit: Temblor, CC BY-NC-ND 4.0

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Figure 1. Aftershocks of the mainshock reveal rupture on the Mendocino Fault, which connects to the San Andreas and Cascadia megathrust at the tectonic triple junction. The earthquake epicenters were obtained from the USGS catalog at 9:00 a.m. Pacific time on Dec. 7. The inset includes red stars locating the magnitude 7 epicenter and the magnitude 5.8 Yerington earthquake that struck Nevada several days later. Credit: Temblor, CC BY-NC-ND 4.0

Figure 1. Aftershocks of the mainshock reveal rupture on the Mendocino Fault, which connects to the San Andreas and Cascadia megathrust at the tectonic triple junction. The earthquake epicenters were obtained from the USGS catalog at 9:00 a.m. Pacific time on Dec. 7. The inset includes red stars locating the magnitude 7 epicenter and the magnitude 5.8 Yerington earthquake that struck Nevada several days later. Credit: Temblor, CC BY-NC-ND 4.0

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