Turbidity currents generated by Hurricane Iwa |
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| Authors: | A T Dengler P Wilde E K Noda W R Normark |
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| Institution: | (1) Marine Sciences Group, Department of Paleontology, University of California, 94720 Berkeley, CA;(2) Associates, 615 Piikoi Street, Suite 1000, 96814 Honolulu, HI;(3) United States Geological Survey, 345 Middlefield Road, 94025 Menlo Park, CA |
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| Abstract: | Off southwest Oahu, Hawaii, an array of current sensors recorded four successive episodes of downslope displacement associated with high-speed near-bottom currents of up to 200 cm/s and elevated water temperatures. These episodes coincided with the maximum storm effects of hurricane Iwa. Sensors from four moorings recorded increases in depth of as much as 220 m, implying downslope movement of as much as 2.4 km at speeds up to 300 cm/s. A succession of slope failures at or above the 110-m shelf break, each resulting in a turbidity current event, is the favored explanation.We dedicate this work to Gil Van Dyke, who lost his life in an accident during deployment of the current meter moorings. |
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