In the opening chapter of this compilation, the authors process and geologically interpretate the marine geological mapping of a detailed grid of very high resolution seismic profiles recorded in the Campania continental shelf between the Solofrone river mouth and Agnone. Following this, an integrated analysis of the volcanic structures located in the subsurface of Naples and the Gulf of Gaeta is presented based on the geologic interpretation of seismic profiles. The goal of this study is to advance the seismo-stratigraphic knowledge concerning volcanic structures occurring in this sector of the Tyrrhenian offshore. In the closing study, geochemical and tomography techniques were applied to agricultural area near the coastline of Spain with the following objectives: determining the spatial and vertical distribution of nutrients and soluble salts in the agricultural area; identifying the different layers of soil and subsoil; and evaluating the relationships between the identified layers and leaching of salts and nutrients.