United States Geological Survey YearbookThe Survey, 1987 - Geology |
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Page 1
... miles of the Earth's surface , an area approximately equal to the combined land areas of the States of Wisconsin and Mich- igan . Because the waters of the lakes con- ceal the bedrock beneath them from direct , conventional geologic ...
... miles of the Earth's surface , an area approximately equal to the combined land areas of the States of Wisconsin and Mich- igan . Because the waters of the lakes con- ceal the bedrock beneath them from direct , conventional geologic ...
Page 2
... miles of seismic reflection profiles ( fig . 1 ) . In this technique , air guns that release blasts of compressed air beneath the lake surface generate strong sound waves , which propagate to the lake bottom and are transmitted deep ...
... miles of seismic reflection profiles ( fig . 1 ) . In this technique , air guns that release blasts of compressed air beneath the lake surface generate strong sound waves , which propagate to the lake bottom and are transmitted deep ...
Page 3
... miles or more into the crust beneath the lakes and be reflected so that their ech- oes are recorded by hydro- phones along the streamer cable that stretches for almost 2 miles behind the ship about 30 feet below the surface . Large ...
... miles or more into the crust beneath the lakes and be reflected so that their ech- oes are recorded by hydro- phones along the streamer cable that stretches for almost 2 miles behind the ship about 30 feet below the surface . Large ...
Page 5
... miles thick but then were greatly thinned to current thicknesses of no more than 6 miles beneath the center of the rift ( fig . 5 ) . During attenuation , the enormous thick- ness of basalt and sedimentary rocks was deposited into the ...
... miles thick but then were greatly thinned to current thicknesses of no more than 6 miles beneath the center of the rift ( fig . 5 ) . During attenuation , the enormous thick- ness of basalt and sedimentary rocks was deposited into the ...
Page 6
... MILES 10 20 30 KILOMETERS Sedimentary rocks Sedimentary rocks and interlayered basalt flows Basalt flows and interlayered sedimentary rocks Crust of Archean Superior province Granitic and metavolcanic rock near surface Bend in line 369 ...
... MILES 10 20 30 KILOMETERS Sedimentary rocks Sedimentary rocks and interlayered basalt flows Basalt flows and interlayered sedimentary rocks Crust of Archean Superior province Granitic and metavolcanic rock near surface Bend in line 369 ...
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activities Administration agencies Alaska aquifer basin Bureau Calcasieu River cartographic CD ROM Chief City City of w coal color Commission concentrations Connecticut contamination cooperative Coordination County crater data base Department of Public deposits drilling Earth Science earthquakes energy Enewetak Environmental facilities Federal feet Figure fiscal year 1987 geographic information systems geologic map Geologist geophysical gram graphic ground water hazards hydrologic Hydrologist investigations Lake Nyos land located lower Calcasieu River major Management ment miles million mineral resources mining models National Center National Mapping Division Office organic compounds Park percent Planning processes production projects Province quadrangle Regional Reston rocks samples San Andreas fault San Joaquin River scientific scientists sedimentary sediments seismic selenium Service South Stop studies surface Survey's techniques tion topographic Transportation U.S. Geological Survey United users USGS Vernalis Volcano Water District Water Resources water-use zone