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The stability of the low-frequency peaks (< 1 Hz) obtained in the passiveseismic survey of Campo de Dal\'ias basin (CDB) by applying thehorizontal-to-vertical spectral ratio (HVSR) method was investigated. Threetemporary seismic stations were installed in remote sites that enabled studyingthe stationarity of their characteristic microtremor HVSR (MHVSR) shapes. Allstations began to operate in mid-2016 and recorded at least one year ofcontinuous seismic ambient noise data, having up to two years in some. Eachseismic station counted with a monitored borehole in their vicinity,registering the groundwater level every 30 minutes. The MHVSR curves werecalculated for time windows of 150 s and averaged hourly. Four parameters havebeen defined to characterize the shape of the MHVSR around the main peak and tocompare them with several environmental variables. Correlations between MHVSRcharacteristics and the groundwater level showed to be the most persistent. Therobustness of MHVSR method for applications to seismic engineering was notfound to be compromised since the observed variations were within the marginsof acceptable deviations. Our results widen the possibilities of the MHVSRmethod from being a reliable predictor for seismic resonance to also being anautonomous monitoring tool, especially sensitive to the S-wave modifications.

On the Use of the Microtremor HVSR for Tracking Velocity Changes: A case study in Campo de Dal\'ias basin (SE Spain)