023 hawaiian island geology

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Meiji (3000 m deep) Over 100 volcanoes in a volcanic island arc system Big Island Hawaiian Islands Niihau Kauai Oahu Molokai Lanai Maui Hawaii Bathymetric Profile of Hawaiian Emperor Chain J Tuzo Wilson (1963), a Canadian geophysicist ,came up the "hotspot" theory volcanoes of the Hawaiian chain should get progressively older and become more eroded the e t a l i P a farther they travel beyond c u i f a ) i t K es d l Pa c the hotspot o ( u h Oa ui waii st) a M Haounge (y Age of Hawaiian Islands Moves in a northwesterly direction Much of the Hawaiian island arc is underwater and extends toward Midway WE’VE GOT HOT SPOTS ALL OVER THE PLACE Other examples of hot spots include: Cape Verde (off the coast of Senegal), Galapagos Islands (off the coast of Equator), Society Islands (French Polynesia), Tristan da Cunha (southern Atlantic), Yellowstone, Ethiopia Plateau, Lord How (near Sydney), Iceland, and many more Older islands erode and subside Aging islands and coral: • Drilling and removing core sample • C14 dating Darwin’s Theory of Coral Atoll Formation: Subsidence Theory Fringing Reef- boarders coastline closely Island subsides Barrier Reef- separated from land by a lagoon Atoll- coral ring with central lagoon lagoon is a shallow area with a sandy floor, patch reefs, and patches of seagrass Fringing Reef- Tahiti Shoreline Fringing Reef Reef Flat Reef Front Barrier Reef Profile patch reef lagoon inner reef flat island outer reef flat reef front reef slope Australia- Great Barrier Reef Kaneohe Bay Barrier Reef Fringing Reef Patch Reef Lagoon ReefFlat Flatof ofaaBarrier barrier reef Reef Reef Coral Island (Cay or Motu) Reef Flat Reef Front Open Ocean Cross Section of an Atoll Belize- Blue Hole Atoll Midway Atoll Kure Atoll (28° 25' N - 178° 20' W) Pearl & Hermes Atoll [...]... Theory Fringing Reef- boarders coastline closely Island subsides Barrier Reef- separated from land by a lagoon Atoll- coral ring with central lagoon lagoon is a shallow area with a sandy floor, patch reefs, and patches of seagrass Fringing Reef- Tahiti Shoreline Fringing Reef Reef Flat Reef Front Barrier Reef Profile patch reef lagoon inner reef flat island outer reef flat reef front reef slope Australia-... inner reef flat island outer reef flat reef front reef slope Australia- Great Barrier Reef Kaneohe Bay Barrier Reef Fringing Reef Patch Reef Lagoon ReefFlat Flatof ofaaBarrier barrier reef Reef Reef Coral Island (Cay or Motu) Reef Flat Reef Front Open Ocean Cross Section of an Atoll Belize- Blue Hole Atoll Midway Atoll Kure Atoll (28° 25' N - 178° 20' W) Pearl & Hermes Atoll
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