File:The Earth beneath the sea - History (1963) (20937726349).jpg

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Title: The Earth beneath the sea : History
Identifier: earthbeneathseah00hill (find matches)
Year: 1963 (1960s)
Authors: Hill, M. N. (Maurice Neville), 1919-
Subjects: Ocean bottom; Marine geophysics
Publisher: New York : Interscience Pub.
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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SECT. 2) OCEANIC ISLANDS, SEAMOUNTS, GUYOTS AND ATOLLS 3. Seamounts 369 A seanioujit may be defined as a more or less isolated elevation of the sea floor with a circular or elliptical plan, with at least 1 km (ca. 500 fm) of relief and comparatively steep slopes. This definition fits both flat-topped and pointed features. The former are a special class which will be discussed in more detail under the heading "guyots". Seamounts are indicated by soundings taken in the days of the Challenger Expedition, but it remained for Murray (1941) to make the first adequate description of a group of seamounts. Now an extensive literature exists and more than 1200 seamounts are known to be dis- tributed in all the ocean basins (Figs. 1 and 2); roughly 200 have been surveyed 80° 7P» _60° _ 501 40° 30* 20* 10' 0° 10° 20° 30° 40° 50° 60° 70° 80° 90° 100° 110° 120° «»•
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80° 70° 60° 50° 40° 30° 20° 10° 0' 90° 100° 110° 120° Fig. 2. Seamounts, atolls, volcanoes and related features in the world exclusive of the Pacific. Uncertainty of reported occurrences indicated by query. in sufficient detail to establish the shape, and bedrock has been dredged from about 50. It seems clear that almost all, if not all, seamounts are submarine volcanoes because the bedrock is always basalt, and the shapes and slopes are characteristic of no other land-form. The only volcanic feature lacking in early surveys of seamounts was a crater at the top. This occasioned much speculation. However, the Precision Depth Recorder shows craters on many seamounts and it is highly probable that the earlier types of sounders simply concealed the crater in confused side echoes. The total number of seamounts (including guyots) shown on the distribution charts is probably only a small fraction of the number that exists. The charts

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Flickr tags
InfoField
  • bookid:earthbeneathseah00hill
  • bookyear:1963
  • bookdecade:1960
  • bookcentury:1900
  • bookauthor:Hill_M_N_Maurice_Neville_1919_
  • booksubject:Ocean_bottom
  • booksubject:Marine_geophysics
  • bookpublisher:New_York_Interscience_Pub_
  • bookcontributor:MBLWHOI_Library
  • booksponsor:MBLWHOI_Library
  • bookleafnumber:397
  • bookcollection:biodiversity
  • bookcollection:MBLWHOI
  • bookcollection:blc
  • bookcollection:americana
  • BHL Collection
  • BHL Consortium
Flickr posted date
InfoField
4 September 2015



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