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. 2017 Jun 29;8:15991. doi: 10.1038/ncomms15991

Figure 1. Imaging mini-earthquake ruptures with our ultrahigh speed full-field technique.

Figure 1

(a,b) Earthquakes are mimicked in the laboratory by dynamic ruptures propagating along an inclined frictional interface, under the applied shear and normal prestresses simulating tectonic loading applied to a fault within the Earth’s crust. The level of prestress is controlled by the applied far-field loading P and interface inclination angle α. Part of the interface has a speckled pattern applied for the subsequent analysis. The picture of the San Andreas Fault, shown for visual comparison in a, is modified from www.sanandreasfault.org (Copyright (c) David K. Lynch). (ce) The full-field time histories of displacements, velocities and stresses are experimentally obtained by capturing sequences of images with ultrahigh speed photography, and processing them with pattern-matching algorithms and highly tailored analysis. The case shown is for P=23 MPa and α=29°.