Figure 11From: S-wave attenuation in northeastern Sonora, Mexico, near the faults that ruptured during the earthquake of 3 May 1887 Mw 7.5Comparison of the nonparametric attenuation functions obtained with station OAX (continuous lines) with expected attenuation calculated using equation ( 4) with geometric spreading G ( r ) = r- b(dotted lines) and theoretical geometric spreading G(r) = r- 1(dashed lines). The circles are the observed horizontal spectral amplitudes used to obtain the attenuation functions.Back to article page