updated 1 June 2023, 17:07 UTC
The SSGEOS records fluctuations of electric charge in the atmosphere near sea level. In relationship to Earth's axis-rotation these fluctuations point to regions where approximately a seismic increase can occur, often within 1 to 6 days, but 8 days have been observed. These regions are marked with purple on the maps below. It should be noted that this method is not perfect and cannot provide exact locations.