http://library.coastweb.info/4888/ Offshore continuation of volcanic rift zones, El Hierro, Canary Islands El Hierro is the youngest and most southwesterly of the seven Canary islands. The established view, based on subaerial geology, is that El Hierro is a classic example of an oceanic island with 120° –– spaced volcanic rift arms (VRZs) forming a "merce Gee, M.J.R. Masson, D.G. Watts, A.B. Mitchell, N.C. QE Offshore continuation of volcanic rift zones, El Hierro, Canary Islands 2008-11-03T12:41:40Z Gee, M.J.R., Masson, D.G., Watts, A.B. and Mitchell, N.C. (2001) Offshore continuation of volcanic rift zones, El Hierro, Canary Islands. Journal of Volcanology and Geothermal Research, 105 (1/2). pp. 107-119.