Interpretation of seismic refraction data with a personal computer on-site

Abstract

The generalized reciprocal method of seismic refraction interpretation is implemented on the IBM PC and compatible series of microcomputers. The implementation is heavily interactive, using spreadsheet style editors, templates and interactive graphics. Data input is in the form of raw traveltime curves, surface elevations, shot positions, uphole times and system delay times. No phantoming or other data processing needs to be done to the traveltime curves. Output is in the form of report ready graphics display of traveltime data, time depths, layer velocities and interface elevations in cross section form. The program, called GREMIX, can accept spreads with up to 69 geophones and nine shots. The interpretation allows for up to four layers, and can be carried out in about one hour per spread.