caa a22 4500 469057068 CHVBK 20180323132847.0 cr unu---uuuuu 170328e19920601xx s 000 0 eng 10.1007/BF03002967 doi (NATIONALLICENCE)springer-10.1007/BF03002967 Caputo Michele Dipartimento di Fisica Universita degli Studi di Roma «La Sapienza» Piazzale A. Moro, 2-00185, Roma aut Laboratory results, stress field and rheology of the crust and upper mantle [Elektronische Daten] [Michele Caputo] Risultati di laboratorio, sforzi e reologia della crosta a mantello superiore It is seen that the maximum shear stress generated by the short wavelengths of the topographic load is relevant only in the uppermost part of the crust and that a feature with wavelength w<10 km and load τrr causes a maximum shear stress with upper limit τrr/2 at a depth smaller thatw. It is also seen that in the Apennines the amplitude of the Fourier components of the topographic features of wavelengthw is proportional tow 1.5. Assuming for the mantle and the crust rheological properties similar to those found in the laboratory for many glassy materials and represented by stress strain relations containing derivatives of fractional order, it is seen that the creep and relaxation in a sphere are wavenumber dependent. At the same time after the formation of a mountain range a feature identified with a long wave has crept more than one identified with a short wave, in contrast with the finding that at present the topographic features with shorter wavelength have smaller Fourier amplitude than those with large wavelength. Therefore we see that the topographic load causes in the mantle a stress mostly due to the long waves while in the crust it is due to all the wavelengths; the stress due to the long waves and transmitted to the mantle is governed by its rheology and, because of the faster creep, is isostatically supported, that due to the short waves is supported elastically and governed by the rheology of the crust. 2 Myr after the formation, a topographic feature with a base of few kilometers is reduced to 82% and causes a creep of the upper crust of 3.7 · 10-3 cm/yr, in the mantle the same feature would cause a creep rate of 0.21 cm/yr and reduce its height to 20% in only 7 · 104 yr. It is also seen that the time to reduce to one halt the creep of a glacial period is approximately equal to twice the duration of the glaciation. Accademia nazionale dei Lincei, 1992 Earth nationallicence Rheology nationallicence Topography nationallicence Stress field nationallicence Tectonic nationallicence Rendiconti Lincei Springer-Verlag 3/2(1992-06-01), 81-96 1120-6349 3:2<81 1992 3 12210 https://doi.org/10.1007/BF03002967 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF03002967 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Caputo Michele Dipartimento di Fisica Universita degli Studi di Roma «La Sapienza» Piazzale A. Moro, 2-00185, Roma aut NATIONALLICENCE 773 0- Rendiconti Lincei Springer-Verlag 3/2(1992-06-01), 81-96 1120-6349 3:2<81 1992 3 12210 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer