This study analyzes the environmental impacts of the June 7, 2023, earthquake with a magnitude M4.8 that occurred in the vicinity of Plovdiv-Asenovgrad, Bulgaria, and was felt throughout the country. Its intensity in the epicenter area reached 6.5, and in the rest of the country, it varied in the range of 3–4.5. The time period June 7–10 was precisely analyzed using seismic data from the Bulgarian National Operative Telemetric System for Seismological Information (NOTSSI) and data with a resolution of 1 s for the ultra-low-frequency (ULF) variations of the geomagnetic field vector along its three directions: north-south (X), east-west (Y), and vertical (Z). A map of the intensity was constructed according to the Medvedev–Sponheuer–Karnik (MSK-64) macroseismic scale of the settlements in the vicinity of the epicenter, and its main features were discussed. The behavior of the geomagnetic field variations along the Y component, recorded in the Geomagnetic Observatory Panagjurishte, is altered after the main shock and continuously until the end of the aftershock series. This is expressed by an increase in the values of the variations and the emergence of sharp peaks only along the east-west direction of the geomagnetic field variations. According to the analysis, the effect on the geomagnetic field variations as a part of natural electromagnetic noise is not a consequence of the processes of Solar-Earth interactions, rather it might be related to the influence of co- or/and post-seismic activity effects.