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Using the Horizontal-to-Vertical Spectral Ratio (HVSR) method, the soil fundamental frequency (f0) was determined at 12 different sites within the Holocene fluvio-marine system located in the eastern sector of the Guadiana River estuary, within the municipality of (Spain). Seismic noise recordings were complemented by three additional sites located on Pliocene sediments of the Guadalquivir Basin, north of the Ría Carreras. The recorded f0 values range between 0.71 and 1.36 Hz. Furthermore, a mechanical basement has been identified, trending WNW–ESE and gently dipping toward the southwest. This basement lies below sea level at depths between approximately −130 and − 20 m. Geological and geophysical data suggest the existence of a blind normal fault affecting the basement of the Guadalquivir Basin. This structure appears to control the Quaternary depocenters, with the downthrown hanging wall block hosting the delta and marshlands of the Guadiana River mouth. Considering both historical and instrumental seismicity, the Holocene sediments of this depositional system should be regarded as a key factor in assessing the seismic vulnerability of buildings in Isla Cristina, particularly social housing built prior to the implementation of seismic-resistant regulations.

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Seismic Noise Recording in Holocene Fluvio-Marine Systems: Preliminary Results and Implications for the Vulnerability Assessment of Isla Cristina (Huelva, Spain)

  • 会议论文

  • 发表日期：

    2026年

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  • David Amador Luna,
  • Francisco Manuel Alonso-Chaves,
  • Ángela Macías Pérez,
  • Carlos Baena Arrabal,
  • Manuel Vázquez-Boza,
  • Beatriz Zapico-Blanco

摘要

Using the Horizontal-to-Vertical Spectral Ratio (HVSR) method, the soil fundamental frequency (f0) was determined at 12 different sites within the Holocene fluvio-marine system located in the eastern sector of the Guadiana River estuary, within the municipality of (Spain). Seismic noise recordings were complemented by three additional sites located on Pliocene sediments of the Guadalquivir Basin, north of the Ría Carreras. The recorded f0 values range between 0.71 and 1.36 Hz. Furthermore, a mechanical basement has been identified, trending WNW–ESE and gently dipping toward the southwest. This basement lies below sea level at depths between approximately −130 and − 20 m. Geological and geophysical data suggest the existence of a blind normal fault affecting the basement of the Guadalquivir Basin. This structure appears to control the Quaternary depocenters, with the downthrown hanging wall block hosting the delta and marshlands of the Guadiana River mouth. Considering both historical and instrumental seismicity, the Holocene sediments of this depositional system should be regarded as a key factor in assessing the seismic vulnerability of buildings in Isla Cristina, particularly social housing built prior to the implementation of seismic-resistant regulations.