Space weather and geomagnetic activity related to the Japanese M7.1 earthquake recorded on February 13, 2021.

On February 13, 2021 at 14:07:50 UTC, an M7.1 earthquake was recorded in Japan at a depth of 49.9 km. The analysis of solar activity and terrestrial geomagnetic activity allowed the authors to verify that the M7.1 Japanese earthquake was preceded by an increase in solar activity which subsequently produced an increase in terrestrial geomagnetic activity: phenomena of electromagnetic nature that the authors have related to the M6+ global seismic activity since 2011. [ABSTRACT FROM AUTHOR]