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Design and application of an electromagnetic vibrator seismic source

Journal of Environmental and Engineering Geophysics

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DOI: 10.2113/JEEG11.1.9

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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.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Design and application of an electromagnetic vibrator seismic source
Series title:
Journal of Environmental and 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
First page:
9
Last page:
15
Number of Pages:
7