GNGTS 2024 - Atti del 42° Convegno Nazionale

Session 1.2 GNGTS 2024 Our structural data show that the strike of the Younger Stampar crater row is consistent with the strike of nearby historic and prehistoric eruptve fssures, as well as the orientaton of the volcanic systems of the Reykjanes Peninsula. Our numerical models indicate that dike-induced compressive stress (caused by the earlier feeder dike), together with the contrastng stfness of the layers, can explain the arrest of the later dike and the lack of britle deformaton at the surface. Specifcally, the presence of a stf lava fow on top of a sof tuf concentrated the feeder dike-induced compressive stress in the lava fow, favoring dike arrest at the tuf-lava contact. These results have implicatons for hazard studies in other volcanic areas, partcularly as regards dike arrest at shallow depths, in Iceland and worldwide. Corresponding author: noemi.cort@unimib.it