2017/05/08 by Rajib Biswas, Biswas, Rajib, Saurabh Baruah +1
Earth and Planetary Sciences · Engineering · #FOS: Physical sciences #Geophysics (physics.geo-ph) #Seismic Imaging and Inversion Techniques #Seismic Performance and Analysis #Seismic Waves and Analysis
paper · pdf · doi:10.48550/arxiv.1705.02952
openalex publication_date 2017/05/08 · openalex created_date 2017/05/19 · openalex updated_date 2026/07/28
We endeavor to assess site response exploiting ambient noise measurements which we carried out at 70 sites in different parts of Shillong City, one of the seismically active regions. We estimate the spectral ratio from these recordings. The spectral ratios reveal the resonant frequency for Shillong City in the range of 3 to 8 Hz. Short scale spatial variation in the resonant frequencies suggests that there is prominent lateral heterogeneity in the underlying layers. Besides, a non-linear earthquake site response analysis is also attempted using available geotechnical data. A good correlation is observed between site response analysis and HVSR results constrained by wide variation of resonant frequency at short distances. The results are found to be tallying well with the geological data.