Integrated geophysical methodology for subsurface modeling and seismic response analysis in the Campi Flegrei area

The Campi Flegrei area, located in southern Italy, is characterized by complex geological stratigraphy and elevate seismic and volcanic risks, exacerbated by ongoing bradyseismic phenomena.

This region, located in a densely populated context, poses significant challenges for seismic hazard assessment due to its geological complexity, frequent seismic activity and the vulnerability of infrastructures

The recently recorded seismic swarms, including those of 2023, further highlight the need for accurate subsurface characterization to assess and mitigate seismic risks.

In this context, a geophysical campaign is being conducted as part of a larger project aimed at advancing seismic microzonation and providing detailed data for risk mitigation strategies. This contribution focuses on the application of an integrated geophysical methodology for reconstructing a detailed subsurface model for local seismic response analysis at several sites of particular interest for civil protection purposes in the Campi Flegrei area.

In this study, new geophysical data were acquired and then processed through integration with geological data. Geophysical surveys include both passive seismic measurements, carried out with single-station and array configurations, and active seismic testing using the Multichannel Analysis of Surface Waves (MASW) method. These passive and active seismic techniques yield information on shear-waves velocity profiles and subsurface heterogeneities.The ongoing analyses aim to explore the characteristics of the volcanic subsurface, contributing to a better understanding of its structural complexity. A strong emphasis is placed on integrating geophysical and geological data to improve the resolution and accuracy of the subsurface model.

This work highlights the critical role of non-invasive geophysical methodologies, such as passive and active seismic methods, in urban and volcanic areas. These efforts support the strategic objectives of urban geophysics by promoting urban resilience and sustainability, while also providing actionable insights for prevention and urban planning in the Campi Flegrei area.

By integrating advanced geophysical techniques, this research enhances the understanding of subsurface properties and their interaction with seismic phenomena, laying the foundation for effective risk mitigation and resilience-building measures in this highly complex and dynamic region.