Growth fault on insular slope/rise of western Iceland; comparison with SE Greenland canyons and slumps |
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Authors: | Julius Egloff G L Johnson |
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Institution: | (1) Seafloor Geosciences Division, Naval Ocean Research and Development Activity NSTL Station, 39529, MS;(2) Arctic Programs, Office of Naval Research, 800 N. Quincy St., 22217 Arlington, VA |
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Abstract: | A recently active normal fault and extensional crevasse on the western insular slope/rise boundary of Iceland adjoins a rotational
slump that moved as the lower block of an active growth fault. A slump off SE Greenland is contrasted to the western Iceland
slope/rise feature in translational movement and slump morphology. Bergschrund-like extensional cracks and valleys at the
heads of slumps serve as troughs channeling gravity flows into established canyons on the midrise. Distinctive characteristics
of buried canyons and levees may be confused with slump or slide surfaces and related subbottom features that have similar
seismic reflection qualities. Examples are defined forGrowth Fault/Rotational Slumps, andTranslational Displacement Slumps. |
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Keywords: | |
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