Experimental study of thermal and strain fields during deformation of en enchelon faults and its geological implications

摘要: The article presents results of experimental studies using a bi-axial servo-control system to apply load on samples with extensional and compressional en echelon faults. During the experiments, variations temperature thermal images were recorded synchronously by multi-path contact-type thermometric apparatus image system, respectively. A digital CCD camera was employed collect specimens’ surfaces. speckle correlation method (DSCM) utilized analyze define displacements strain fields. Our show that fields have clear responses opposite stress states in jog areas both types Prior failure area, its is highest at faults lowest Records DSCM give evidence mean area It revealed deformation occurs two stages, developing from build-up fault propagation unstable sliding along fault. Correspondingly, mechanism heating-up converts heating into friction heating. period transformation rising mechanism, three events are observed vicinity. Analyses our demonstrate temperatures can be indicative suggest directions. Observations changes during sensitive portions great importance for early detection precursors slip active