Bulletin of Volcanology

, Volume 53, Issue 4, pp 259–275

The pattern of circumferential and radial eruptive fissures on the volcanoes of Fernandina and Isabela islands, Galapagos

  • William W ChadwickJr
  • Keith A Howard

DOI: 10.1007/BF00414523

Cite this article as:
Chadwick, W.W. & Howard, K.A. Bull Volcanol (1991) 53: 259. doi:10.1007/BF00414523


Maps of the eruptive vents on the active shield volcanoes of Fernandina and Isabela islands, Galapagos, made from aerial photographs, display a distinctive pattern that consists of circumferential eruptive fissures around the summit calderas and radial fissures lower on the flanks. On some volcano flanks either circumferential or radial eruptions have been dominant in recent time. The location of circumferential vents outside the calderas is independent of caldera-related normal faults. The eruptive fissures are the surface expression of dike emplacement, and the dike orientations are interpreted to be controlled by the state of stress in the volcano. Very few subaerial volcanoes display a pattern of fissures similar to that of the Galapagos volcanoes. Some seamounts and shield volcanoes on Mars morphologically resemble the Galapagos volcanoes, but more specific evidence is needed to determine if they also share common structure and eruptive style.

Copyright information

© Springer-Verlag 1991

Authors and Affiliations

  • William W ChadwickJr
    • 1
  • Keith A Howard
    • 1
  1. 1.US Geological SurveyMenlo ParkUSA
  2. 2.Hatfield Marine Science CenterOSU/CIMRSNewportUSA

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