Figure 14. We processed an inversion from the linear combination of the two forward problem solutions (Fig. 13), constrained by the 1993-1997 GPS 3-D displacements. The computed wall shear stress variations are compatible with recorded « multi-phase » seismic events variations. Because the two observations are independent, this gives further support that these seismic events are related with shear stress release at the duct wall.

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