The Research of Rare Earth-Iron Giant Magnetostrictive Seismic Source of Shallow Seismic Exploration

Abstract

Due to the lack of resolution and precision of shallow seismic reflection exploration, the seismic source made of rare earth-iron giant magnetostrictive material (GMM) is used in the shallow reflection seismic exploration, and the resolution and precision is improved. GMM seismic source has more merit than the conventional seismic source. The characteristic of GMM seismic source is that the bandwidth of the seismic wave transmitted by the source is large. It is able to sweep through a range of frequency from tens Hz to thousands Hz. The parameters of the seismic source are easy to change, such as seismic energy, waveform and time length. Portable structure makes it convenient to transport and setup. The only thing should be considered before use is coupling. Its cost is not as big as other seismic source. The seismic source mentioned above can cover the shortage of shallow seismic exploration. It is an effective method to improve the exploration. A shallow seismic reflection exploration specimen machine with GMM seismic source is designed, including seismic source, driving circuit, waveform generator, data acquisition instrument and experiment system. The speed of propagation of seismic wave and the attenuation factor of soil was tested. Echo detecting experiment has also been finished. Basal experiment result is positive and further experiment is on progress at present.