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Figure 4. (a) and (b) Comparisons between the principal component of deconvolved seismograms and synthetic seismograms. For time-domain deconvolution (T.D.), we applied a Gaussian filter: G(f) = exp(–²f²/a²), where f is frequency and a is the Gaussian width (set to 5 sec^–1). For frequency- domain deconvolution (F.D.), we used a six-pole, zero-phase Butterworth filter between 0.1 and 1.2 Hz. (c) Crustal model used to generate synthetic seismograms by the reflectivity algorithm of Randall (1989). For crustal thickness and V_S, we smooth the model of Rai et al. (2003) with a single, linear gradient in the crust. The gradient of V_P is assumed to be 0.025 km/ sec/km, close to the global average of 0.031 km/sec/ km (Christensen and Mooney, 1995).

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