Fig. 2: UAV photograph of the Nisida tuff cone (Photo courtesy of Dr. Enrico Cascella) and simplified illustration of the feeder dyke.
From: Magma chamber failure and dyke injection threshold for magma-driven unrest at Campi Flegrei caldera
a Simplified sketch describing the main geometrical features of the Nisida feeder dyke, where Ed and v are the dynamic Young’s Modulus and the Poisson ratio, respectively. L and h are respectively the strike and dip dimensions of the dyke, while w and P0 are the dyke width and overpressure. The bottom left pop-up shows the length of the dyke and its relationships with the caldera ring fault zone. b Interpreted field photographs showing the dyke-induced faults; only the cut-offs of the main fault have been considered. White and blue dots represent fault tips and branch points, respectively. The bottom right plot shows equiareal lower-hemisphere plane projections of the faults. c Simplified sketch showing the relationships between dyke-induced graben features and dyke syn-emplacement depth and width.
