Hole-to-hole seismic seam wave observations

The results are described for a hole-to-hole seam wave study conducted in the Zulia Coal basin of Northwestern Venezuela in June 1979, and to prove the applicability of hole-to-hole surveys in mapping the continuity of coal beds. Some conclusions are as follows: 1) An event having three characteristics of a seam wave is present in the records. 2) In this particular experiment, covering the period ranging from 3 to 30 ms, horizontal displacement is better trapped than vertical displacement. 3) The experiment has broadened the utility of the seam wave methods to include coals of interest of the Western United States. 3 refs.