• nyquist: a program to calculate Nyquist frequency given a specified sampling interval.
• sig2vs: a program to convert Poisson's ratio into S-wave velocity.
• vs2sig: a program to convert S-wave velocity into Poisson's ratio.
• transf: a program to transform delta and epsilon into delta^(v) and epsilon^(v), needed in AVO modeling for an HTI medium.
• gcyl: a program to calculate the gravity anomaly caused by a cross section of a cylindrical body.
• gsphere: a program to calculate the gravity anomaly caused by a spherical body.
• v2rho: a program to convert velocity into density using Gardner's equation.
• rho2v: a program to convert density into velocity using Gardner's equation.
• ricker: a program to generate ricker wavelet with specified frequency.
• nmo2int: a program to calculate interval velocity from NMO velocity using Dix's equation.
• shuey2: a program to calculate reflectivity response as a function of incidence angle using the two-term Shuey's approximation (truncated).
• hilt: a program to calculate reflectivity response as a function of incidence angle using Hilterman's approximation.

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