Coastal & Marine Geology InfoBank

Home FACS Activities Atlas Geology School Related Sites More

USGS CMG InfoBank: Seamounts

Skip navigational links
Dictionaries: Our Mapping Systems   The USGS and Science Education   USGS Fact Sheets   Topics   Keywords   Data Dictionary   Metadata Dictionary   Computer Terminology   Digital Formats  
InfoBank Terms: Activity ID   activity overview   crew   digital data   formal metadata   lines   metadata   NGDC   port stops   project/theme   region   ship   stations   time   virtual globe   year  
Data Types: bathymetry   biological   geochemical   gravity   ground penetrating radar   imaging   LIDAR   logs   magnetics   metering equipment   navigation   samples   seismic   total station   definitions disclaimer  
Data Formats: ARC coverage   E00   FGDC metadata   gridded/image   imaging   material   scattered/swath   Shapefile   vector/polygon  
Comment: 22:09 - 23:16 (01:07)
Source: Annenberg/CPB Resources - Earth Revealed - 6. Plate Dynamics
Keywords: "Tanya L. Atwater", topography, "sea floor", seamount, "volcanic cone", "hot spot", volcano, "lava flow", plate, Hawaii, island, Aleutians, "Pacific Plate"

Our transcription: When you just look at the topography of the general sea floor, every now and then you find a seamount.
There'll just be little round cones.
They range from real small to huge.
Hawaii is one.
We don't know about all of them, but a lot of them seem to be related to hot spots.
Hot spot volcanism happens when there's a place way down in the mantle that for some reason produced extra lava, so much extra that it bubbles right up right through the plate and builds a seamount on top.
Often it builds an island like Hawaii and the whole chain of islands that's strung along behind Hawaii.
The reason they're interesting is that the hot spots seem to be still or nearly still down in the mantle, and so when the plate moves over it, it keeps making new volcanoes in a line, so that right now the Big Island of Hawaii is being built.
The islands up the chain get older and older and there's, in fact, a chain that stretches way across the sea floor all the way up to The Aleutians, which are older and older, showing us the motion of the Pacific plate over that Hawaiian hot spot.

Geology School Keywords
Skip footer navigational links

Coastal and Marine Science Centers:  Pacific   St. Petersburg   Woods Hole  
InfoBank   Coastal and Marine Geology Program   Geologic Information   Ask-A-Geologist   USGS Disclaimer  

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: InfoBank staff
Page Last Modified: Thu Oct 31 04:25:51 PDT 2013  (chd)