Measuring Dip and Stike underground?

[brettrj]

We're using Suunto Tandem to survey here in PA and I'm interested in learning how to measure the dip and strike underground. Part of the cave we are mapping is formed along a fault and I'd like to be able to get accurate dip and strike to make sense of the structure. I'm able to tell which is which and have tried my hand at it on the surface with some success. Does anybody have any tips on doing it in cave?

[ian mckenzie]

I read about that somewhere; maybe in an old Compass and Tape. Basically you just hold the clino body agains a dip bed and measure away; same with the compass for strike. The difficulty comes when the cave passage wall does not run directly down dip; I think you then have to locate the same strata on the opposite wall and draw an imaginary horizontal line between the two and clino at right angles to that. Not as easy as it sounds. Of course, dip/strike may vary throughout the cave.