|
Library >>
Renewable Energy Resource
Maps >> North America
>> Geothermal
Geothermal Energy in NORTH AMERICA
 
The Geothermal Map of North America is based on terrestrial
heat flow as the primary determination for the earth's
crustal/lithospheric thermal conditions. Heat flow
is the measure of earth's transfer of energy and represents
the expression of heat sources within the earth. It
is a key indicator of the potential availability of
heat as a usable resource.
This map illustrates heat transfer from lithospheric
to local (individual geothermal system) scales.
Three types of heat flow data points are included
on the map and used for contours that range from 15–150
milliwatts per square meter. They are shown by different
symbols because they may not be comparable on a point-by-point
basis, but the regional comparisons are useful.
Heat flow data is from published heat flow values
with strict criteria that limit the numbers of such
data. Bottom hole temperature (BHT) data is from Canadian,
United States, and Mexican oil and gas wells. Heat
flow was estimated using BHT data and thermal conductivities
where they could be appropriately determined. Western
Geothermal Database data is heat flow from industry
thermal gradient measurements in areas expected to
have high heat flow. In geothermal systems, the gradients
are often more than 75 degrees C per kilometer, and
heat flow is more than 120 milliwatts per square meter.
The basemap is from the U.S. Geological Survey's
The National Map for GTOPO30 (shaded relief;
province, state, and country boundaries; and rivers);
ESRI sample data for place-names and city locations;
and General Bathymetric Chart of the Oceans (GEBCO)
data. Other data included is Holocene volcanoes and
hot springs. View the U.S. map data.
http://www.esri.com/mapmuseum/mapbook_gallery/volume20/mining2.html
Countries
Canada | Greenland | United
States of America
Related GENI Resources
Links
|
