caa a22 4500 477047742 CHVBK 20180405111334.0 cr unu---uuuuu 170330e19960601xx s 000 0 eng 10.1007/BF00876435 doi (NATIONALLICENCE)springer-10.1007/BF00876435 Absorption of strain waves in porous media at seismic frequencies [Elektronische Daten] [T. Chelidze, H. Spetzler, G. Sobolev] An understanding of strain wave propagation in fluid containing porous rocks is important in reservoir geophysics and in the monitoring in underground water in the vicinity of nuclear and toxic waste sites, earthquake prediction, etc. Both experimental and theoretical research are far from providing a complete explanation of dissipation mechanisms, especially the observation of an unexpectedly strong dependence of attenuationQ −1 on the chemistry of the solid and liquid phase involved. Traditional theories of proelasticity do not take these effects into account. In this paper the bulk of existing experimental data and theoretical models is reviewed briefly in order to elecidate the effect of environmental factors on the attenuation of seismic waves. Low fluid concentrations are emphasized. Thermodynamical analysis shows that changes in surface energy caused by weak mechanical disturbances can explain observed values of attenuation in real rocks. Experimental dissipation isotherms are interpreted in terms of monolayered surface adsorption of liquid films as described by Langmuir's equation. In order to describe surface dissipation in consolidated rocks, a surface tension term is added to the pore pressure term in the O'Connell-Budiansky proelastic equation for effective moduli of porous and fractured rocks. Theoretical calculations by this modified model, using reasonable values for elastic parameters, surface energy, crack density and their geometry, lead to results which qualitatively agree with experimental data obtained at low fluid contents. Birkhäuser Verlag, 1996 Dissipation nationallicence strain waves nationallicence poroelasticity nationallicence surface energy nationallicence Chelidze T. Institute of Geophysics, Georgian Academy of Sciences, 1 Rukhadze str., 380093, Tbilisi, Georgia aut Spetzler H. Bavarian Geoinstitute, Univ. Bayreuth, 95440, Bayreuth, Germany aut Sobolev G. Institute of the Physics of the Earth, Russian Academy of Sciences, 10 Bolshaia Gruzinskaia, Moscow, Russia aut pure and applied geophysics Birkhäuser-Verlag 147/1(1996-06-01), 25-55 0033-4553 147:1<25 1996 147 24 https://doi.org/10.1007/BF00876435 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00876435 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Chelidze T. Institute of Geophysics, Georgian Academy of Sciences, 1 Rukhadze str., 380093, Tbilisi, Georgia aut NATIONALLICENCE 700 1- Spetzler H. Bavarian Geoinstitute, Univ. Bayreuth, 95440, Bayreuth, Germany aut NATIONALLICENCE 700 1- Sobolev G. Institute of the Physics of the Earth, Russian Academy of Sciences, 10 Bolshaia Gruzinskaia, Moscow, Russia aut NATIONALLICENCE 773 0- pure and applied geophysics Birkhäuser-Verlag 147/1(1996-06-01), 25-55 0033-4553 147:1<25 1996 147 24 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer