Fig. 7From: Reframing the magnetotelluric phase tensor for monitoring applications: improved accuracy and precision in strike determinationsa Penalty functions and concentration into quadrant I of the strike estimated using the analytic formula. The continuous lines represent the penalty functions for one period and seven realizations. The red circles represent the strikes from the analytic formula. b The black curve represents the estimates using least squares and the red curve using the analytic formula. The green dashed line corresponds to the true strikeBack to article page