This study delves the interplay of Rayleigh wave-groundwater-aquifer dynamics, utilizing seismic data from designated stations, particularly the magnitude 9 event on March 11, 2011 (02:46:23 PM epicenter), Tohoku Earthquake, Japan. Auto spectra uncover significant peaks, linking groundwater shifts with Rayleigh waves' vertical motion. High coherence between groundwater levels and seismogram vertical shifts confirms this connection. Coherence analysis validates it within a frequency range. Aquifer storage coefficient estimation aligns with confined aquifer norms, ranging from 1.0E-05 to1.0E-03. This consistency holds true across different methods and other earthquake event, highlighting seismic impact. The research emphasizes seismic relevance for groundwater insight. Expanding datasets is recommended for coefficient precision. These insights enhance understanding of aquifer behavior during seismic events, aiding groundwater management and earthquake readiness in susceptible regions. Further research should expand datasets for coefficient accuracy. Insights advance aquifer behavior comprehension during seismic events, guiding groundwater management and earthquake readiness in prone regions.