Fig. 4.From: An adjoint data assimilation method for optimizing frictional parameters on the afterslip areaUpdates of the frictional parameters: (a) A : A − B, (b) A : L, and (c) A − B : L planes. The arrows indicate the updates of the frictional parameters from the first-guess to the estimated values. Circles also indicate the values at each iteration and the number of iterations. Stars indicate the true values.Back to article page