ABSTRACT A linear synchronous motor (LSM) is an electric motor that can produce large
controllable forces and is therefore suitable as a driving engine for a seismic vibrator. This …

Multi-criteria derived from features have become character objects. When measurements
are made of them by weighting methods, each criterion is a decision. Thus, criteria as object …

Analysis of vibroseis data shows that harmonic distortion in the ground-force signal may
exceed the primary distortions in the hydraulic system. This can be explained by the …

The geometry of the contact between a vibrator and the earth underneath influences the
dynamics of the vibrator. Although a vibrator might appear to be well-coupled with the earth …

Several high-frequency seismic sources (ie., sledgehammer, pipegun, weightdrop, and
small-and intermediate-size vibrators) have been tested at a site characterized by a surface …

Extending the vibroseis bandwidth toward low frequencies (below 10 Hz) can bring many
benefits for land seismic exploration such as deeper signal penetration and for near-surface …

The feedback system of seismic vibrators minimizes the difference between the theoretical
sweep and the seismic signal radiated into the earth. This requires the determination of the …

1.2. 1 Definition of the surface wave method 4 1.2. 2 Rayleigh waves, dispersion, modal
superposition (chapter 2) 4 1.2. 3 Modelling the propagation of Rayleigh Waves: simulation …

Shear-wave vibrator is a type of equipment usually employed for natural gas exploration,
consisting of a vibrating machine which applies dynamic loads to the surrounding soils in …

The nonlinear interaction between a vibrator and the ground is one of the main sources of
signal distortion in land exploration. So, it is crucial to describe this nonlinear interaction and …