Electronic Resource
Oxford, UK
:
Blackwell Publishing Ltd
Geophysical prospecting
8 (1960), S. 0
ISSN:
1365-2478
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Geosciences
,
Physics
Notes:
The velocity of supersonic pulses in cylindrical drill cores and rock samples is measured as a function of the frequency or wave length λ of the pulses. If λ is very much lower than the diameter D of the drill core –λ 〈 D– the higher velocity of the longitudinal waves vl appears; on the other side we get the lower velocity of the rod waves vd (Stabdehnungswellen) if λ 〉 D.Some drill cores from the carbon were found the velocities of which for sonic and supersonic pulses do not follow the above rule. It is shown that these cores have a constant velocity both for short and for long wave lengths in a frequency range between 5 kHz and 2 MHz.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1365-2478.1960.tb01494.x
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