OCNG 251 Lecture Notes - Lecture 4: Turbidity, Cayman Trough, Subduction
22 Feb 2017
School
Department
Course
Professor
Document Summary
Continental margins: shallow, close to land. Deep-ocean basins: deep, further from land. Mid-ocean ridges: tall volcanic mountain ranges running along divergent plate boundaries. Bathymetry: measurement of ocean depths and charting of shape of ocean floor topography, measures vertical distance from surface to mountains, valleys, plains and other seafloor features, this measurement is important because. Determines wave patterns and erosion in shallow waters. Navigation in shallow waters for ships, and deep water for submarines. Crew of uss san francisco: crashed into uncharted seamount going 30 knots, radar was off so relied on incorrect maps that showed that the seamount did not exist there, measuring: Ship movement makes line payout greater than actual depth. Not always sure when the weight hits bottom. Exact location of ship not known until fairly recently. Made 1st systematic measurement of seafloor in 1872. Systematic= every regular amount of time or distance. 1st to do it specifically for science unlike captain cook in late 1700s.
