Figure 6. Seismic activity in Northern California. Each panel represents a two-day window of seismic events. The top left shows the magnitude 5.7 and magnitude 6.2 earthquakes near Petrolia, California, on December 20, 2021, with 2 days of aftershocks. The top right illustrates the magnitude 6.4 event near Ferndale, California on December 20, 2022 with two days of aftershocks. THe bottom panels depict pre- and post-seismic activity for the magnitude 7.0 Cape Mendocino, California earthquake on December 5, 2024. The bottom panels highlight the relative seismic quiescence before the mainshock, and the uptick in seismicity after. Earthquakes plotted from USGS. Credit: Temblor, CC BY-NC-ND 4.0

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Figure 6. Seismic activity in Northern California. Each panel represents a two-day window of seismic events. The top left shows the magnitude 5.7 and magnitude 6.2 earthquakes near Petrolia, California, on December 20, 2021, with 2 days of aftershocks. The top right illustrates the magnitude 6.4 event near Ferndale, California on December 20, 2022 with two days of aftershocks. THe bottom panels depict pre- and post-seismic activity for the magnitude 7.0 Cape Mendocino, California earthquake on December 5, 2024. The bottom panels highlight the relative seismic quiescence before the mainshock, and the uptick in seismicity after. Earthquakes plotted from USGS. Credit: Temblor, CC BY-NC-ND 4.0

Figure 6. Seismic activity in Northern California. Each panel represents a two-day window of seismic events. The top left shows the magnitude 5.7 and magnitude 6.2 earthquakes near Petrolia, California, on December 20, 2021, with 2 days of aftershocks. The top right illustrates the magnitude 6.4 event near Ferndale, California on December 20, 2022 with two days of aftershocks. THe bottom panels depict pre- and post-seismic activity for the magnitude 7.0 Cape Mendocino, California earthquake on December 5, 2024. The bottom panels highlight the relative seismic quiescence before the mainshock, and the uptick in seismicity after. Earthquakes plotted from USGS. Credit: Temblor, CC BY-NC-ND 4.0

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