Design and application of an electromagnetic vibrator seismic source
Journal of Environmental & Engineering Geophysics
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Abstract
Vibrational seismic sources frequently provide a higher-frequency seismic wavelet (and therefore better resolution) than other sources, and can provide a superior signal-to-noise ratio in many settings. However, they are often prohibitively expensive for lower-budget shallow surveys. In order to address this problem, I designed and built a simple but effective vibrator source for about one thousand dollars. The "EMvibe" is an inexpensive electromagnetic vibrator that can be built with easy-to-machine parts and off-the-shelf electronics. It can repeatably produce pulse and frequency-sweep signals in the range of 5 to 650 Hz, and provides sufficient energy for recording at offsets up to 20 m. Analysis of frequency spectra show that the EMvibe provides a broader frequency range than the sledgehammer at offsets up to ??? 10 m in data collected at a site with soft sediments in the upper several meters. The EMvibe offers a high-resolution alternative to the sledgehammer for shallow surveys. It is well-suited to teaching applications, and to surveys requiring a precisely-repeatable source signature.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Design and application of an electromagnetic vibrator seismic source |
| Series title | Journal of Environmental & Engineering Geophysics |
| DOI | 10.2113/JEEG11.1.9 |
| Volume | 11 |
| Issue | 1 |
| Year Published | 2006 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Journal of Environmental and Engineering Geophysics |
| First page | 9 |
| Last page | 15 |
| Google Analytic Metrics | Metrics page |