(1) Peru Chile (2500 miles long) (4124 fathoms long)
(2) Mindanus Trench (5738 fathoms)
(3) Marrana Trench (5936 fathoms)
(4) Tonya Trench (5810 fathoms)
(5) Ranapo (Japan) (5510 fathoms)
(6) Vitiog (Marrana 6000 fathoms) not confirmed
(7) Middle American Trench
Gulf of Cable to Panama
Shape
Shape much
Sedimentation
Extent submarine volcano there
Trenches and Island Arcs - Crustal movement involved - Earthquakes most
common in this area, shallow crust quake
Island arc and volcanoes also
Lines of Volcanoes parallel trenches arc shaped island also associated gravity pull
greater under trenches lies under lands
Sea Mount & Griyots
Sea mountains & extinct volcano lava cools quickly and gives a very steep slope
approximately 100 volcanic (basaltic)
Griygot - Flat top and terraced sides - can't be explained by volcanism - possibly
flat mountains at or near sea level - waves cut summit quickly (ash & scorea)
Coral reef can add to flat top by growth - also shares a sediment margin but can't
find any rimmed coral (Marshalls/ Gilberts on slope)
Possibility of Submergence
(1) Subsidy ocean floor and sea level use
(2) Lava release - gas for H20 ocean floor sand and H20 added (regional
subsidence)
Shelf Study Methods & Instrumentation
(1) Gravimetric
(2) Magnetometic
(3) Corers
(4) Drudges
(5) Diving - Lung, Hard Hat
30 fathoms average depths (oil area)
man 200 feet and (50 fathoms)
Jacques Cousteau
Peter Stenurt
General Info:
Average Width = 42 miles
Average Depth = 72 fathoms
Average Depth of flat areas = 32 fathoms
Average slope =10 fathoms per mile
Dispute of Continual Shelf and off Shore Limits
US - 12 mile (3mile)
USSR-
Peru-
Mexico-