United States Geological Survey Reports a 3.5 Magnitude Earthquake in Mariposa County, California on Sunday, January 15, 2023 Details Last Updated: Sunday, 15 January 2023 15:04 Published: Sunday, 15 January 2023 15:04 View Comments January 15, 2023 - The United States Geological Survey reports a 3.5 Magnitude Earthquake in Mariposa County, California on Sunday, January 15, 2023 at 2.51 P.M.Some resident reporting hearing and feeling the earthquake.USGS Map of the areaSource: USGS View the discussion thread. back to top