- The Pacific Ocean is known as the biggest ocean on the earth which occupies 1/3rd part of the entire globe.
- Pacific Ocean Extension 16000 km in East-West (Asia Coast to America (West Coast), With this, 14800 km in North or South (Bering Strait – Cape Andre (Antarctica).
- The average depth of the Pacific Ocean is 4500 m.
- Both the Pacific Ocean’s coast (E&W) is similar to each other. And they are surrounded by the chains of the folded mountain, descent from coast to the abyssal plain.
- There are approx. 20,000 islands located in the Pacific Ocean.
Island’s group is divided into 3 categories:-
- Continental islands: –
- Aleutian Islands
- Islands of British Columbia of Canada (Vancouver Island, Quadra Island, Denman Island, Gabriola Island, North Pender Island, Salt Spring Island, Hornby Island, Galiano Island, Cortes Island, and Saturna Island).
- Chilean islands (Chiloé Island, Robinson Crusoe Island, Alejandro Selkirk Island, Isla Salas y Gómez, Isla Grande de Tierra del Fuego, Navarino Island, Santa Clara Island, San Ambrosio, Mocha Island and Desolación Island).
- Island Archs & Festoons:
- Japanese Archipelago (Shikoku, Kyushu, Honshu, Ishigaki, Yakushima Island, Miyako-Jima, Itsukushima, Kuril Islands, Iriomote-Jima, and Yonaguni).
- Philippines (Luzon, Boracay, Mindanao, Siargao Island, Palawan, Negros, Leyte, Mactan, Panay, Samar Island).
- Indonesian Islands (Sumatra, Bali, Java, Sulawesi, Lombok, Borneo, Flores, New Guinea, Lesser Sunda Islands and Maluku Islands.
3. South-West group of islands are categorized into three parts.
|Johnson Division of Pacific ocean|
|Northern Pacific||1. It’s the very deepest part of the world.|
2. Avg. depth is 5000m-6000m.
3. join with Arctic Sea(Through Bering Straits).
|Central Pacific||1. A huge no, of islands, are found in this region.|
2. volcanic prone region.
|South-West Pacific||1. Many Islands.|
2. Marginal Seas.
3. Extensive Continental.
4. shelvesOceanic Trenches.
|South-East Pacific||1. Most striking relief- East Pacific ridges|
2. Absence of marginal seas.
Continental shelf: continental shelfs are meet in the pacific oceans, those are significantly difference, through an extend and characteristics. It’s found a different place and a unique size, that is divided into two parts such as:
|1. Australia and Asia||– Coast area are very Broad|
– Found the extensive shelves
|2. Width Varies b/w||– It’s almost defined as 150-1650 km|
|3. Depth Ranges||– Approx. 1000-2000m|
|4. Several Islands (Specific Shelves characteristics.||– Kuriles|
– Japanese islands
– New Zealand etc.
|5. Eastern Marginal Seas||– Coral Sea|
– Java Sea
– Sea etc.
- West coast is less extensive continental shelfs, because its nearby to cordilleran cover chains, which are occupied from folded mountains to specific coastal lands.
- Its avg. width cover is about 80 km.
East Pacific Rise
|1. Ridges||1.There are not found mid-oceanic ridges such as the Atlantic or the Indian Ocean.|
2. Few Scattered Ridges.
3. East Pacific rise/ridge are albatross plateau.
|2 . Wides Cover||– 1600 km.|
|3. Extending size from||– North New Zealand to the California Coast.|
|4. Branches||1. Eastern branches- its branch connect with the Chilean coast.|
2. Other branches- its rise move toward southward in identified east island rise.
|5. Other Ridges||1. Galapagos ridges- flow east pacific ridges|
i. Branches- Cocos and Carnegic ridges.
2. Hawaii Rise- its increase toward north-west to south-east.
i. Depth- 800-970m.
i. Width- 2650km.
3. New Zealand Ridges- depth 300 to 2000m sea level.
i. Cover near Fiji island plateau.
4. Nazca Ridge- off Peru Coast.
6. Cover Zones
|1. Clarion Fracture zone.|
2. Challenger fracture zone.
3. Molokai fracture zone etc.
Basin Of Pacific Ocean
There can divide several kinds of Basin of Pacific Ocean such as:
|1. Philippine Basin||– East area of PhilippineAvg.|
– depth: 5000 to 6000m
– Kyushun paian ridge runs in the middle of the basin.
– 5N- south of Japan sea.
|2. Fiji Basin||– Direction 10s – 32sAvg.|
– Depth: 4000m.
– South of Fiji island cover
– Covered: Norkolk island ridge
Karmadec; tonga Trench.
|3. Pacific Antarctic Basin||– Between the 40s and 60s|
– Extends 130w longitude
– South-west of Chilean coast
|4. Peru Basin||– 5s – 24s longitude|
– Avg. depth: 4000m
– Western cover of Peru coast-110w.
|5. South Australian Basin||– Avg. depth 5000m|
– Aka Jeffreys Basin
|6. East Australian Basin||– Avg. Depth 4500m|
– Vary between Australia and New Zealand.
|7. South-West Pacific Basin||– West karmadec Trench|
– 20s – 50s latitude