Professor Ingemar Larsson of the Royal Institute of Technology in Stockholm reported in 1972 that he completed a systematic study concerning ground water in faults and fractures in a granite rock and found that the results can be compared with those of uniaxial testing of granite specimens in rock mechanic laboratories. Dikes of diabase intersect the granite and indicate the plane of deformation syntectonic to the dikes. A collection of the tectonic data from the granite was statistically treated and the tectonic picture of the area fits very well into the deformation plane, indicated by the intrusion (Jotnian).
The faults and fractures of the granite are, according to their position in relation to the plane of deformation, hypothetically interpreted as tension and shear faults. The faults in shear position are supposed to be tight and carry very little ground water. The tension faults, on the other hand, are supposed to be open and to be capable of high yields of ground water. This hypothesis is tested by core-drillings, percussion drillings and test pumping.
[He planned to look around the world for application of his developing model. He was appointed the lead in a large UNESCO project termed: Groundwater in Hard Rocks. His team visited Sardinia, India, Tanzania, and elsewhere in presented lecture tours. See: https://i2mconsultants.com/downloads/mdcampbell/UNESCOgwnhrks.pdf
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