Seismic activity and thunderstorm centers have strong relation because of which fourth mode (26Hz) of Schumann Resonance (SR) is varying. SR has numbers of resonance frequencies like first mode (8 Hz), second mode (14 Hz), third mode (20 Hz) and fourth mode (26 Hz). The variation of 4th mode of SR is taken into account due to the seismic effect. Characteristics of ionosphere changes on surface during & aftershock the main shock (https://www.britannica.com/science/aftershock-geology). The effective height of the ionosphere lower boundary is reduced to a few tens of kilometer. The lower ionosphere & mesosphere is modified by the seismic source detection of modification in higher frequency band. The Schumann Resonance signal is supported by electromagnetic radiation from the global thunderstorms & the anomaly in SR fourth mode frequency i.e. the shifting of frequency due to lowering of Ionosphere height is accumulated in this paper.
Schumann resonance;Earthquake;ELF;Fourth mode SR;Ionosphere;Thunderstorm