caa a22 4500 475813367 CHVBK 20180406123803.0 cr unu---uuuuu 170329e20000301xx s 000 0 eng 10.1007/s000240050007 doi (NATIONALLICENCE)springer-10.1007/s000240050007 Seismic Attenuation in Partially Saturated Dime-shaped Cracks [Elektronische Daten] [H. Schütt, J. Köhler, O. Boyd, H. Spetzler] —We have examined the effect of surface contamination on the attenuation and stiffness of compressional seismic waves in artificial cylindrical glass cracks that are partially saturated with water. The compression of the gap perpendicularly to its plane reduces the gap volume and forces the water to redistribute within the gap (conservation of volume of an incompressible liquid). On clean surfaces, the water can flow without significant resistance across the glass. This leads to a very low and almost constant attenuation over a wide frequency range (approx. 3 mHz to 10 Hz), while the sample stiffness is constant. In the case of propanol contaminated surfaces, both the attenuation and the stiffness are considerably higher than in the clean case, and display a considerable frequency dependence. Both effects can be explained with the Restricted Meniscus Motion Model. In this model, the redistribution of the liquid in the gap first leads to a change (increase) of the contact angle. The change of the meniscus curvature results in an increase of the pressure in the liquid and thus to a stiffening of the sample. When the resistive force, that prevents the contact line from sliding along the surface, is finally overcome, the contact line starts moving across the contaminated surface. The motion against the resistive force dissipates energy and increases the attenuation. The calculated data are in good agreement for both the clean and the contaminated case; the model parameters fall in the range that was established by independent experiments (e.g. ). Birkhäuser Verlag Basel,, 2000 Key Words: Attenuation, surface contamination, partially saturated cracks, dime-shaped nationallicence Schütt H. Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado at Boulder, Campus Box 216, Boulder, CO 80309-0216, U.S.A., e-mail: schuett@colorado.edu, US aut Köhler J. BASF AG, 201/ZC, D-67056 Ludwigshafen, Germany, formerly at 1., DE aut Boyd O. Western Geophysical, Houston, TX 77042, U.S.A. formerly at 4., US aut Spetzler H. Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado at Boulder, Campus Box 216, Boulder, CO 80309-0216, U.S.A., e-mail: schuett@colorado.edu, US aut https://doi.org/10.1007/s000240050007 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s000240050007 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Schütt H. Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado at Boulder, Campus Box 216, Boulder, CO 80309-0216, U.S.A., e-mail: schuett@colorado.edu, US aut NATIONALLICENCE 700 1- Köhler J. BASF AG, 201/ZC, D-67056 Ludwigshafen, Germany, formerly at 1., DE aut NATIONALLICENCE 700 1- Boyd O. Western Geophysical, Houston, TX 77042, U.S.A. formerly at 4., US aut NATIONALLICENCE 700 1- Spetzler H. Cooperative Institute for Research in Environmental Sciences (CIRES), University of Colorado at Boulder, Campus Box 216, Boulder, CO 80309-0216, U.S.A., e-mail: schuett@colorado.edu, US aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer