MASW joint analysis of Rayleigh and Love waves for site characterization

1. Juan José Hellín-Rodríguez
2. Pedro Martínez-Pagán ¹
3. Ignacio Valverde-Palacios
4. Antonio García-Jerez
5. Koya Suto
6. Marcos Antonio Martínez-Segura ¹
7. José Francisco Orta
8. Julia Álvarez-Lozano

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DOI: 10.23967/ISC.2024.131 GOOGLE SCHOLAR lock_openSarbide irekia editor

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The determination of reliable shear-wave velocity models using Multichannel Analysis of Surface Waves (MASW) hasincreased importantly for site characterisation studies due to their use in geotechnical studies and regulations. The standardMASW approach is commonly based on the analysis of vertical component of Rayleigh waves, which can result ininaccurate and potentially erroneous interpretations by personal bias. Thus, we present the joint analysis of different andindependent multi-component data based on Rayleigh and Love waves to obtain 2D Vs sections for site characterization.Those seismic data were recorded using a landstreamer consisting of 8 triaxial 4.5Hz geophones. To generate Rayleighwaves, the blows were given vertically on a plate, and for the Love waves the blows were given laterally on a horizontalwooden beam. A joint analysis of Rayleigh and Love waves data was conducted on seismic data recorded from themetropolitan area of Granada city (Spain) to generate their dispersion curves. This new approach enabled a properidentification of fundamental- and higher-mode surface waves facilitating the reliable reconstruction of subsurface Vsprofiles through a robust joint inversion process. The MASW 1D Vs versus depth models were corroborated at severaltest sites by the information obtained from boreholes. Thus, the main geological formations could be inferred from MASW2D Vs sections down to a depth of 30 meters, as well as the Vs30 parameter to perform a reliable seismic microzonationof the study area. This methodology provides a very well constrained inversion procedure capable of providing a robustsubsurface Vs model for site characterization.