Quote:
Originally Posted by (E)
I used some data I found for Germany that had an average increase of 3.5° C for every 100m of depth. The caveat with the data was it wasn't from a strictly alpine region. 100°C was reached at a depth of between 2.2 and 3.4 km deep.
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Studies for alpine tunnel construction give values of 40-50℃, but this can drop a lot if there's a water flow in the rock. (A
link!) (ETA:
Beautiful graph p9!)