Bridges – Bridge geomorphic features were first described by Gardner and Armstrong (2011) as blocks of material that partially infill the Mariana Trench in four locations, forming a “bridge” across the trench. In this study we have extended Gardner and Armstrong’s (2011) interpretation and applied it to all troughs and trenches and have identified a number of bridge features that appear to partially infill trenches and troughs in the global ocean. Slumping on the sides of some troughs and trenches has formed a bridge across the trench/trough, thereby dividing it into two separate sections
Statistics of bridges (after Harris et al., 2014).
|Ocean||Bridge area km2||Number of Bridges||Average Bridge Size km2|
|Mediterranean and Black Sea||270||18||20|
|North Atlantic Ocean||210||16||10|
|North Pacific Ocean||2410||33||70|
|South Atlantic Ocean||60||4||20|
|South Pacific Ocean||2850||32||90|
Gardner, J.V., Armstrong, A.A., 2011. The Mariana Trench: A new view based on multibeam echosounding, American Geophysical Union, Fall Meeting 2011. American Geophysical Union, San Francisco.
Harris, P.T., MacMillan-Lawler, M., Rupp, J., Baker, E.K., 2014. Geomorphology of the oceans. Marine Geology 352, 4-24.