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acoustic impedance amplitude angle apparent resistivity applied axis body Bouguer anomaly cable calculated component contours correction cross-correlation curve deconvolution deﬁned density depth determined direction distance earth effect electrodes energy equation exploration FIGURE ﬁlter ﬁrst ﬂow Fourier transform frequency function geologic geophone Geophys geophysicist Geophysics gradient gravimeter gravity anomaly gravity data horizontal inﬁnite input interface interpretation inverse layer lithology magnetic ﬁeld magnetometer Magnetotelluric marine measured meter method migration moveout noise observed obtained operations output plotted position processing proﬁle range recording reﬂection reﬂector refraction rocks salt dome sample sedimentary seismic data seismic reﬂection seismic waves seismogram shear shooting shot point shown in Fig signal signiﬁcant speciﬁc stack static station structure subsurface surface techniques tion trace variations velocity vertical vibroseis wave waveform wavelength wavelet Western Geophysical zero zone