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<p>Local amplification is an important factor when assessing local earthquake ground motion in an area covered by soft sedimentary deposit (lithological site effects), 2D basins and/or marked by the presence of hills or mountains (topographical site effects). In the present study, we propose to estimate the local ground motion linked to these site effects in Anse-à-Veau, a municipality in the Nippes Department of Haiti. This region was also affected by intense seismic shaking during the M 7.2 Nippes earthquake in August 2021, and the numerous aftershocks. The surveys have been carried out during the measurement campaigns in 2021, 2022 and 2023, and include ambient noise and earthquake recordings, seismic surveys as well as electrical resistivity measurements along profiles. The two first ones were processed, respectively, in terms of horizontal to vertical spectral ratios and standard spectral ratios, the seismic tests both as seismic refraction tomography and by multichannel surface wave analysis and the last measurements as electrical resistivity tomography. In total, more than 150 ambient noise recordings, 22 seismic profiles and 8 electric profiles have been completed. All related results were then compiled within one multi-data 3D geomodel and submitted to a spatial analysis by applying a conditional geostatistical simulation which is expected to take advantage of the relationships between the different type of seismic data in order to better estimate the potential site effects in the study area. The site amplification parameters are then used to compute local ground motion for the 2021 Nippes Earthquake at Anse-à-Veau using Next Generation Attenuation.</p>

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Local amplification assessment supported by geostatistical analysis and geomodelling of geophysical data for the Anse-à-Veau region, Haiti

  • 期刊论文

  • 发表日期：

    2025年8月1日

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  • Valmy Dorival,
  • Hans-Balder Havenith,
  • Kelly Guerrier,
  • Sophia Ulysse,
  • Dominique Boisson

摘要

Local amplification is an important factor when assessing local earthquake ground motion in an area covered by soft sedimentary deposit (lithological site effects), 2D basins and/or marked by the presence of hills or mountains (topographical site effects). In the present study, we propose to estimate the local ground motion linked to these site effects in Anse-à-Veau, a municipality in the Nippes Department of Haiti. This region was also affected by intense seismic shaking during the M 7.2 Nippes earthquake in August 2021, and the numerous aftershocks. The surveys have been carried out during the measurement campaigns in 2021, 2022 and 2023, and include ambient noise and earthquake recordings, seismic surveys as well as electrical resistivity measurements along profiles. The two first ones were processed, respectively, in terms of horizontal to vertical spectral ratios and standard spectral ratios, the seismic tests both as seismic refraction tomography and by multichannel surface wave analysis and the last measurements as electrical resistivity tomography. In total, more than 150 ambient noise recordings, 22 seismic profiles and 8 electric profiles have been completed. All related results were then compiled within one multi-data 3D geomodel and submitted to a spatial analysis by applying a conditional geostatistical simulation which is expected to take advantage of the relationships between the different type of seismic data in order to better estimate the potential site effects in the study area. The site amplification parameters are then used to compute local ground motion for the 2021 Nippes Earthquake at Anse-à-Veau using Next Generation Attenuation.