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Abstract

Summary

This study provides an integrated geophysical approach to enhancing subsurface characterization in the seismically active Fuente Vaqueros located in the Granada Basin, southern Spain. The complex fault plane systems of the area with its soft sedimentary cover enhance seismic ground motion, thus establishing the need for high-resolution subsurface models to be utilized in seismic hazard assessment. Classical active seismic methods such as Multichannel Analysis of Surface Waves (MASW) could provide limited depth resolution if applied alone. Hence MASW was combined in this study with passive seismic techniques of Extended Spatial Autocorrelation (ESAC) and Horizontal-to-Vertical Spectral Ratio (HVSR) analysis, to mitigate the mentioned limitation. MASW actively generated a high-resolution near-surface shear-wave velocity (Vs) profile, while passive data helped to investigate further down. The joint inversions of active and passive dispersion spectra produced a composite Vs model with enhanced resolution and consistency, especially at depths beyond the reliable range of active methods. Commercial borehole (SPT) data were utilized to validate the greater accuracy of the integrated approach. The results accentuate the capability of hybrid active-passive surface wave methods to characterize complex sedimentary basins, thus favoring their application in seismic microzonation and mitigation strategies

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2025-09-07
2026-02-08

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References

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/content/papers/10.3997/2214-4609.202520178
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Enhanced Subsurface Modelling using Active and Passive Seismic Methods in Fuente Vaqueros (Granada Basin, Spain)
Conference Proceedings 2025, 1 (2025); https://doi.org/10.3997/2214-4609.202520178
/content/papers/10.3997/2214-4609.202520178
/content/papers/10.3997/2214-4609.202520178
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