A conceptual schematic of a ridge jump from that paper:
DR: Dying rift
PR: Propagating rift
There is a ridge jump towards the hotspot. Due to the ridge jump lithosphere from plate B is transfered to plate A.
A less common type of volcano is the intraplate volcano, which are basically all volcanoes not in plate margins because that are inside (="intra") a plate. Hawaii is probably the most famous example, together with the abundant seamounts elsewhere in the Pacific. They are usually formed by deeper processes, with mantle plumes coming from below the lithosphere.
