Geodynamics: A look into Germany's deepest borehole

What is the physical and chemical composition of our subsurface? Which forces and processes are decisive for its formation? These questions can be answered using the scientific drilling method. The diagram shows the two boreholes (a test borehole to a depth of 4000 m and a main borehole to a depth of 9100 m) that were drilled as part of the Continental Deep Drilling Program (KTB) in Windischeschenbach in the years 1989–1994. These boreholes, the deepest in the world still in scientific use, are considered a milestone in the testing of drilling equipment, but also a breakthrough in the exploration of the subsurface.

The measurements in the two boreholes made it possible to draw conclusions

• On the structure and formation of the subsurface.
• Water flow at different depths;
• The deposition and anomalies of ores;
• Geophysics and geomechanics in fracture zones;
• Temperature changes with increasing drilling depth are also examined.

Further information on the Continental Deep Drilling Program.

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