caa a22 4500 47581374X CHVBK 20180406123804.0 cr unu---uuuuu 170329e20000101xx s 000 0 eng 10.1007/PL00001090 doi (NATIONALLICENCE)springer-10.1007/PL00001090 Stress in the Descending Relic Slab beneath the Vrancea Region, Romania [Elektronische Daten] [A. T. Ismail-Zadeh, G. F. Panza, B. M. Naimark] —We examine the effects of viscous flow, phase transition, and dehydration on the stress field of a relic slab to explain the intermediate-depth seismic activity in the Vrancea region. A 2-D finite-element model of a slab gravitationally sinking in the mantle predicts (1) downward extension in the slab as inferred from the stress axes of earthquakes, (2) the maximum stress occurring in the depth range of 70 km to 160 km, and (3) a very narrow area of the maximum stress. The depth distribution of the annual average seismic energy released in earthquakes has a shape similar to that of the depth distribution of the stress in the slab. Estimations of the cumulative annual seismic moment observed and associated with the volume change due to the basalt-eclogite phase changes in the oceanic slab indicate that a pure phase-transition model cannot solely explain the intermediate-depth earthquakes in the region. We consider that one of the realistic mechanisms for triggering these events in the Vrancea slab can be the dehydration of rocks which makes fluid-assisted faulting possible. Birkhäuser Verlag Basel,, 2000 Key Words: Stress, slab, Vrancea, numerical modelling nationallicence Ismail-Zadeh A. T. International Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences, Moscow, Russia., RU aut Panza G. F. Dipartimento di Scienze della Terra, Università degli Studi di Trieste, Italy., IT aut Naimark B. M. International Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences, Moscow, Russia., RU aut https://doi.org/10.1007/PL00001090 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/PL00001090 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ismail-Zadeh A. T. International Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences, Moscow, Russia., RU aut NATIONALLICENCE 700 1- Panza G. F. Dipartimento di Scienze della Terra, Università degli Studi di Trieste, Italy., IT aut NATIONALLICENCE 700 1- Naimark B. M. International Institute of Earthquake Prediction Theory and Mathematical Geophysics, Russian Academy of Sciences, Moscow, Russia., RU aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer