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          Drilling rig at night, San Andreas Fault Observatory at Depth (SAFOD). USGS photo.                        Land drilling rig.  ORNL Photo.                         Truck mounted drilling rig.  USGS photo.

Borehole data are direct measurements of temperature from boreholes drilled into the Earth's 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. A majority of the borehole data at the World Data Center (WDC) are from the University of Michigan's Global Database of Borehole Temperatures and Climate Reconstructions.

Obtaining Data at the World Data Center                             

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Contributing Data                             

Data and study description information can be contributed by emailing your data to Investigators who wish to contribute their data to the UM Borehole database can use the link provided below.