INVESTIGATION OF PROPAGATION VELOCITIES OF ELASTIC WAVES IN GRANITES OF THE UKRAINIAN SHIELD (WITH SURROUNDING PRESSURE UP TO 1500 BAR (ISSLEDOVANIE SKOROSTI RASPROSTRANENIYA UPRUGIKH VOLI V GRANITAKH UKRAINSKOGO SHCHITA (PRI VSESTORONNEM DAVLENII DO 1500 BAR),
Abstract
Laboratory experiments have been conducted in the Institute of Geophysics of the Ukrainian Academy of Sciences with a newly designed high-pressure hydraulic installation to measure rock properties and seismic wave propagation at pressures up to 1500 bars. Specifically, elastic wave velocities in igneous rock samples taken from the Ukrainian shield were examined. The wave velocities in granite samples were measured with the standard IPA apparatus (portable ultrasonic pulse apparatus). Pressure in the hydraulic installation was regulated by a multiway shut-off valve. The transmission time of the ultrasonic wave through the rock sample was determined as a function of pressure from head wave arrivals. The experimental method used permitted longitudinal wave velocities to be measured with an accuracy of plus or minus 0.7 - 1.4%. As a result of the experiments, it was found that at a pressure of 1500 bars and under natural moisture conditions the longitudinal wave velocity in the samples increased by 5.1 - 11.3C showed a relative velocity change of 22-33%. A definite relationship was found to exist between the relative velocity increase at a given pressure and the density and porosity values of granite samples that had not been exposed to high high temperatures. Granites with greater porosity and smaller density were characterized by a significantly greater relative velocity increase. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 17, 1967
- Accession Number
- AD0676571
Entities
People
- D. V. Korniets
Organizations
- National Air and Space Intelligence Center