Reflection seismic data can provide high-resolution images of the Earth's crust and allow a better understanding of crustal structure on all continents. In this paper we revisit reflection seismic data that were acquired previously across the central part of the Scandinavian Peninsula. Merging individual components of the data set in a more optimal manner resulted in a new image of the crust below the Scandinavian Caledonides with a revised interpretation of the crustal structure in the west.

Sinkholes and caves underground pose challenges for various industries in the karst area, particularly those, such as construction, agriculture, and infrastructure development, dependent on stable ground conditions. In this study, we applied seismic reflection, a geophysical method, to delineate shallow subsurface complex geological structures and to better understand limestone cave formation in Shenzhen, China.

Passive seismic data were acquired along a 2.8 km long profile in the Sudret area of Gotland, Sweden, as part of a feasibility study for storage of CO₂ below the Baltic Sea. Virtual shot gathers were retrieved by seismic interferometry. Both the body waves and surface waves provide high-quality images of the top of the Ordovician formation and have a good consistency with the borehole section. Our results show that passive data can be used for mapping some general geological features in Gotland.

The Collisional Orogeny in the Scandinavian Caledonides project provides insights into the deep structure and bedrock of a ca. 400 Ma old major orogen to study deformation processes that are hidden at depth from direct access in modern mountain belts. This paper describes the successful operations at the second site. It provides an overview of the retrieved geological section that differs from the expected and summarises the scientific potential of the accomplished data sets and drill core.