"International Journal of Geography, Geology and Environment"

Author(s): Mustaq Ahmad Shaikh and Farjana Birajdar

Abstract: The Deccan Volcanic Province (DVP), traditionally classified as a stable continental region, exhibits persistent low-magnitude seismicity that challenges conventional tectonic paradigms. Recent microseismic events in the Sangola tehsil, Solapur district, Maharashtra, have been accompanied by audible acoustic phenomena, providing an opportunity to investigate seismo-acoustic coupling mechanisms. We conducted a comprehensive analysis integrating instrumental seismic data from the National Center for Seismology (India) with systematic documentation of public acoustic reports. Seismic events were analyzed for magnitude-depth relationships, temporal patterns, and frequency characteristics. Acoustic reports were systematically classified and correlated with instrumental records. Four documented earthquakes (M 2.2-3.1) occurred at shallow depths (5-10 km) between 2023-2025, all accompanied by audible "boom" sounds. The shallow focal depths and high-frequency content (5-60 Hz) of P-waves explain the efficient ground-to-atmosphere energy transfer. Temporal correlation between seismic arrivals and acoustic reports is consistent with seismo-acoustic coupling theory. These events represent classical examples of earthquake-generated acoustic phenomena resulting from P-wave coupling to atmospheric acoustic waves. The findings support reclassification of the DVP from tectonically stable to low-level active seismicity, with implications for regional hazard assessment and monitoring strategies.

DOI: 10.22271/27067483.2025.v7.i10a.423

Pages: 07-16 | Views: 110 | Downloads: 57

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