Pacific Oceanic Bottom Relief

• The Pacific Ocean is known as the biggest ocean on the earth which occupies 1/3^rd 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:-

1. 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).

2. Island Archs & Festoons:
   • Kuriles
   • 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.

• Melanesia
• Micronesia
• Polynesia

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:

Eastern Coast:

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 – Philippines – Indonesia – New Zealand etc.
5. Eastern Marginal Seas	– Coral Sea – Java Sea – Tasmania – SeaBering – SeaArafura – Sea etc.

West Coast:

• 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

Basin Of Pacific Ocean

There can divide several kinds of Basin of Pacific Ocean such as:

Basins	Characteristics
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