Borehole data are direct measurements of temperature from boreholes drilled into the Earth crust. Departures from the expected increase in temperature with depth (the geothermal gradient) can be interpreted in terms of changes in temperature at the surface in the past, which have slowly diffused downward, warming or cooling layers meters below the surface.Most borehole data at the WDC are from the University of Michigan's Global Database of Borehole Temperatures and Climate Reconstructions. This project has as its goal the design, assembly, analysis and interpretation of geothermal observations on continents relevant to understanding the nature and causes of climate change over the past five centuries. The project was inititated by the Geothermal Laboratory of the University of Michigan, USA. Important collaborations have been developed with the Geophysical Institute of the Czech Academy of Sciences, and with a working group of the International Heat Flow Commission of IASPEI.
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