At 10:34:24 (UTC) on December 20, 2022, a magnitude 6.4 earthquake occurred on the Northern California coast near Ferndale.
Geophysical Events
Geophysical Event
M 6.4 Ferndale, California
Image
- Magnitude
- M 6.4
Nearest GPS stations
Epicenter and GPS/GNSS stations within 158 kilometers, where displacement of at least 2 centimeters is predicted.
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Long-term GPS station velocities
Long-term average velocities of GPS/GNSS stations in the region.
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Coseismic Displacement
This plot shows the ground displacement measured by GPS stations due to the earthquake. (Data credit: Tom Herring/MIT. Image credit: Christine Puskas/EarthScope.)
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Borehole instruments map
Borehole stations within 500 kilometers of the epicenter (shown by circle).
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Borehole strainmeter data
Measured strain at nearby borehole station B934.
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Borehole seismometer data
Borehole seismometer data arranged by distance from the epicenter. (Amplitudes are normalized for ease of viewing.)
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GPS data
GPS/GNSS data can be accessed <a href="https://observablehq.com/@unavco/event-data-access?eventid=%22nc73821036%22" target="_blank" rel="noopener">here</a>.
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GPS magnitude estimate
Event magnitude estimated by data at GPS/GNSS stations (horizontal motion only).
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GPS magnitude estimate
Event magnitude estimated by data at GPS/GNSS stations (including vertical motion).
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GPS Coseismic Offsets
Data will be <a href="https://data.unavco.org/archive/gnss/products/event/cwu_221220_1035_EQ69_coseis_final.evt">available here</a>.
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Borehole data
High-rate data from borehole strainmeters will be <a href="https://www.unavco.org/projects/project-support/geophysical-event-response/geophysical-event-data/geophysical-event-data.html" target="_blank" rel="noopener">available here</a>.
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Technical
These data are provided by the Geodetic Facility for the Advancement of Geoscience (GAGE) Facility, operated by EarthScope Consortium with support from the National Science Foundation and the National Aeronautics and Space Administration under NSF Cooperative Agreement EAR-1724794. To acknowledge use of these data please follow the acknowledgment guidelines.