Abstract
AbstractPhysical model for regular fault containing a columnar barrier has been designed and conceptually been used to simulate the barrier or strong area concerning earthquake preparation. Biaxial compression experiment with a middle‐size rock sample of this model has been done and AE spatio‐temporal developing characteristics have been studied. Results show that (1) Due to complex action between the hanging wall and lower wall, as well as the barrier, alternate AE activities in different areas become the most remarkable feature during deformation process of the sample. (2) The pre‐condition for instability of regular fault containing a barrier is that the barrier should fail firstly with the increase of loading. The AE spatio‐temporal distribution features are very different before and after the barrier failure. (3) The total deformation amount of this sample is large and its cumulated AE frequency increases exponentially. During the weakening period, there are only a few AE events distributed in barrier and surrounding area. Abrupt instability happens under such a relative quiet background. (4) b values of G‐R relationship for different pre‐setting tectonic patterns have some obvious differences, the regional differences of b value interrelated to different tectonics are remarkable.
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