The rift is only 5 km across. The Juan de Fuca Ridge creates part of the Pacific plate and all of the Juan de Fuca plate. Note the presence of linear seamount chains associated with hot spots. One of the most interesting features of the Juan de Fuca Ridge is the Axial volcano . This active volcano is located at the intersection of the Cobb-Eikelberg hotspot and the Juan de Fuca Ridge.
Axial seamount is a broad volcano with a summit caldera and two rift zones.
The presence of the caldera suggests eruption from a shallow magma chamber and subsequent collapse. Recent lava flows and active hydrothermal systems suggest the volcano is active. Sheet flows that range in age from 9,000-5,000 years drape the flanks of the volcano. Sheet flows less than 5,000 years old fill the floor of the caldera.