Re: Best mines to visit
Posted by Seismo on February 03, 2003 at 11:39:15:
In Reply to: Re: Best mines to visit posted by Harold Ericsson on February 02, 2003 at 22:18:32:
Any ideas as to why underground mines seem so resistant to quake damage?
The linear disruption of the crust's stratification caused by the tunnelling changes the stress characteristics of the rock surrounding the mineshaft. Seismic pulses are interrupted at or near the tunnel and veer off in another direction, thus insulating the surrounding rock from fracture.