The northern rift zone of Axial Seamount is a long ridge running 10 to 20 degrees northeast of the main caldera. The rift is pocketed by multiple fissures, in length, as far as from Axial Volcano's center, and reaching up to long and deep. The area contains high amounts of volcanic glass; a major eruption is still visible in the form of an elongated glassy lava flow extending off the caldera wall, east of the main rift line. Dives in 1983 found extensive low-temperature venting at the northern half of the fissure. The shorter, newer southern rift zone consists of a topographically plunging rift, surrounding by subtle, discontinuous faults. Camera tows along the southern flank reveal that the area is built of delineated sheet flows, small lava ponds, and lava channels.