000015235 001__ 15235
000015235 005__ 20161115100215.0
000015235 04107 $$aeng
000015235 046__ $$k2016-08-21
000015235 100__ $$aFialko, Yuri
000015235 24500 $$aVelocity-weakening behavior of granite and gabbro at temperature up to 600 degrees C (INVITED)

000015235 24630 $$n24.$$p24th International Congress of Theoretical and Applied Mechanics - Book of Papers
000015235 260__ $$bInternational Union of Theoretical and Applied Mechanics, 2016
000015235 506__ $$arestricted
000015235 520__ $$2eng$$aThe depth extend of seismicity in the Earth’s crust is believed to be controlled by a temperature-dependent transition from velocity-weakening to velocity-strengthening friction. Available experimental data on granite suggest a transition from unstable slip to steady creep at temperature about 350 ◦ C. We present results of unconfined experiments on granite and gabbro at both dry and hydrated conditions that show increasingly unstable slip (velocity-weakening behavior) at temperatures up to 600 ◦ C. We estimate the rate-state friction parameters using velocity-stepping tests and by fitting the data to predictions of a 1-D spring-slider model. We find that the “evolution” parameter b increases with temperature at a higher rate than the “direct effect” parameter a. We also find that the aging law provides a better fit to our experimental data compared to the slip law. Obtained results may help explain anomalously deep crustal seismicity in regions of active extension and convergence.

000015235 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000015235 653__ $$a

000015235 7112_ $$a24th International Congress of Theoretical and Applied Mechanics$$cMontreal (CA)$$d2016-08-21 / 2016-08-26$$gICTAM2016
000015235 720__ $$aFialko, Yuri
000015235 8560_ $$ffischerc@itam.cas.cz
000015235 8564_ $$s47179$$uhttps://invenio.itam.cas.cz/record/15235/files/TS.SM06-1.01.pdf$$yOriginal version of the author's contribution as presented on CD,  page 2144, code TS.SM06-1.01
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000015235 962__ $$r13812
000015235 980__ $$aPAPER