Pressure build-up and stress variations within the Earth's crust in the light of analogue models.

摘要: Strength contrasts and spatial variations in rheology are likely to produce significant stress differences the Earth’s crust. The buildup relaxation of stresses have important consequences for state brittle crust, its deformational behaviour seismicity. We performed scaled analogue experiments a classic wedge-type geometry wherein we introduced weak, fluid-filled body representing low-stress heterogeneity. were coupled direct pressure measurements that revealed from their surrounding stressed matrix. magnitude is similar differential strongest lithology system. When rocks with negligible considered, can be more than twice larger lithostatic stress. values consistent estimated analytical studies. This not restricted particular scale or rheology, but it requires materials able support different levels upon deformation. For non-creeping rheological behaviours, maintained even after deformation ceases, implying these preserved nature over geological timescales.