The construction of a simple portable electromagnetic vibrator from commercially available components
T. Dean, H. Nguyen, A. Kepic and D. Halliday
Journal name: Geophysical Prospecting
Issue: Vol 67, No 6, July 2019 pp. 1686 - 1697
Info: Article, PDF ( 16.51Mb )
Since its introduction in the late 1950s, hydraulic vibrators have become the dominant source for land seismic surveys. The hydraulic vibrators typically used for commer-cial land seismic acquisition, however, are large, costly to operate and expensive to purchase. This inhibits their use for small-scale and short-duration surveys as well as Vibroseis research. In this paper we describe, in detail, the construction of a portable vibrator from commercially available components for a cost of less than $US2,000. Data shows that the vibrator is able to successfully transmit sweeps from 15 to 180 Hz with different spectral contents. The vibrator produces a stronger signal than a sledge-hammer and we estimate its output to be around 1 kN. The frequency content of the data was concentrated at lower frequencies (<100 Hz) and the ground-roll was far more energetic than that produced using a sledgehammer.