Converted wave resolution as a function of bandwidth

Arnim B. Haase and Charles P. Ursenbach

ABSTRACT

A 1D-algorithm for the computation of trace envelopes when attenuation is present has been programmed. With this algorithm it is confirmed that adding low-frequency bandwidth can increase resolution. However, beyond a critical depth, adding low frequencies decreases resolution in these computations. A second, more realistic algorithm includes geometrical spreading and a noise floor. Assuming that any signal above the noise floor can be restored to a flat spectrum, pulse widths are computed from boxcar windows. Comparing the resulting pulse widths for C-waves and P-waves shows that adding low-frequency bandwidth improves resolution. Also, resolution crossover depths are moved deeper.

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