Tectonics of the East Pacific Rise near 12°50′N: a submersible study
In: Earth and Planetary Science Letters. Elsevier: Amsterdam. ISSN 0012-821X; e-ISSN 1385-013X, meer
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Earth sciences > Geology > Tectonics
Topography
Topography > Topography (geology) > Bottom topography
Working underwater > Surveying > Surveying underwater
East Pacific Rise [Marine Regions]
Marien/Kust |
| Auteurs | | Top |
- Choukroune, P.
- Francheteau, J.
- Hekinian, R.
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| Abstract |
Using the diving saucer Cyana , a portion of the East Pacific Rise between 12 degree 28' and 12 degree 54'N has been studied and mapped. Four main zones are defined: (1) an active volcanic zone located in the central graben; the graben displays a variable relief along strike from less than 10 m up to 55 m and has an en-echelon pattern in plain view; (2) an active tectonic zone comprising the central graben and extending up to about 2 km from either side of the rise axis; (3) an inactive tectonic zone starting 2 km away from the axis and formed by discontinuous horst and graben type of structures; and (4) off-axis volcanoes (seamounts) located less than 20 km on either side of the rise axis. |
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