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The shallow subsurface of the Harmodio Arias Madrid Campus (Panama City) was characterized using microtremor seismic (ReMi) to estimate shear-wave velocity (Vs) and classify soil type. Six profiles were carried out with two configurations: 110 m spread (10 m spacing) and 55 m spreads (5 m spacing). Data acquisition employed a DAQLink-III® multichannel seismograph (24 bits, 0–4 kHz) and 10 Hz vertical geophones, recording 25 windows of 30 s per profile with a 2 ms sampling rate. Processing in SeisOpt® ReMi™ (Vspect and Disper) included preprocessing, construction of the ?–f spectrum, dispersion curve picking, and iterative layered modeling, with a target RMS misfit < 10 m/s.
The 1D models and 2D maps (0–40 m) identified three units: (i) a soft surface layer (fills/very soft clays), (ii) an intermediate sandy–clayey unit, and (iii) a more competent substratum (soft rock/gravels). Average Vs values per profile (~242–307 m/s) classify the site as soil type D (IBC). Spatially, the northeast and northwest sectors are stiffer; the southeast is softer, and the southwest shows compaction with depth. Proximity to the Curundú River drainage increases site vulnerability. ReMi proved suitable in urban environments for delineating thicknesses and lateral variations of Vs, providing inputs for seismic-resistant evaluation and geotechnical planning.