VULKANOLOGI

Neotektonikk er studiet av bevegelser og deformasjon av jordskorpen, som er nåværende eller nyere i geologisk tid. Kartet viser jordskjelv, fokalmekanismer, spenningsmålinger, postglasiale forkastninger, landhevning, submarine skred, vulkaner, oppløft/erosjon og sedimentavleiring i det norske område. (Neotectonics is the study of motion and deformation of Earth's crust that are current or recent in geological time. The map displays earthquakes, focal mechanisms, stress observations, postglacial faults, glacial isostatic adjustment, submarine slides, volcanoes, uplift/erosion and sediment deposition in Norway and adjacent areas.) Kartet også vedlagt i NGU-rapport 2018.010

The Jan Mayen microcontinent is a small, unique, crustal entity that was separated from the Norwegian and Greenland margins by two distinct rifting events. Seafloor spreading along the Aegir Ridge separated Jan Mayen (together with Greenland) from Norway by ca. 54 Ma. Cessation of seafloor spreading on the Aegir Ridge at ca. 30 Ma was more or less simultaneous with the onset of extension along the Kolbeinsey Ridge between Jan Mayen and Greenland. Break-up along the Kolbeinsey Ridge by ca. 23 or 20 Ma isolated the Jan Mayen microcontinent.