| 词条 | Pioneer Seamount |
| 释义 |
| name = Pioneer Seamount | depth = {{convert|820|m|ft|0|abbr=on}} | height = {{convert|1930|m|ft|0|abbr=on}} | pushpin_map = California | map_caption = Bathymetry of Pioneer seamount. | summit_area = 12.8 km (6.9 nautical miles)x12.8 km (6.9 nautical miles) | location = offshore Central California | group = | coordinates = {{coord|37|21.1|N|123|26.1|W|display=inline, title}}[1] | country = United States | type = Seamount (underwater volcano) | volcanic_group = Central Californian seamounts | age = 10.9 to 11.1 million years | last_eruption = | discovered = | discovered_by = | first_visit = | translation = | language = | pronunciation = | photo = | photo_alt = | photo_caption = }} Pioneer Seamount is an undersea mountain, or seamount, in the Pacific Ocean off the coast of central California. LocationPioneer Seamount is located at 37° 21.1' North Latitude, 123° 26.1' West Longitude,[1] at the base of the continental slope[2] of North America about {{convert|95|km|mi|abbr=off|sp=us}} off the coast[1] just southwest of San Francisco, California.[2] Physical characteristicsThe seamount is a volcano between 10.9 and 11.1 million years old. It is about {{convert|12.8|km|mi|abbr=off|sp=us}} long as well as about {{convert|12.8|km|mi|abbr=off|sp=us}} wide, and has a volume of about {{convert|135|km3|mi3|abbr=off}}. It rises about {{convert|1,930|m|ft|abbr=off|sp=us}} above the surrounding ocean floor, and its peak is a minimum of {{convert|820|m|ft|abbr=off|sp=us}} below the ocean{{'}}s surface. Samples from the seamount consist of highly vesicular alkalic basalt, hawaiite, and mugearite.[3] The seamount and its volcano once extended above the sea surface, but eroded and sank as the seamount and the seabed at its base were carried further away from the spreading center from which it presumably originated. Biological environmentA wide variety of sealife lives on the seamount. Corals dominate in deeper areas and sponges in its shallower parts.[4] NamingPioneer Seamount was named for USC&GS Pioneer, the first of three survey ships of the United States Coast and Geodetic Survey to bear the name. Pioneer operated along the United States West Coast and in the then-Territory of Alaska during her Coast and Geodetic Survey career, which lasted from 1922 to 1941.[5] Notes1. ^1 2 NOAA Vents Program Acoustic Monitoring; Acousting Monitoring Program Pioneer Seamount 2. ^1 United States Geological Survey Monthly Newsletter Sound Waves: Fieldwork: Geologists and Biologists Endeavor to Understand Seamount Environments Off California 3. ^Monterey Bay Aquarium Research Institute: Pioneer Seamount 4. ^Monterey Bay Aquarium Research Institute: Seamounts 2007 5. ^NOAA History: Tools of the Trade: Coast and Geodetic Survey Ships: Pioneer References
1 : Seamounts of the Pacific Ocean |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。