| Popis: |
Summary Small-scale electrodynamic vibratory seismic sources (micro-vibrators) are efficient devices for near-surface investigations up to several hundreds of metres depth. Size, resolution, signal repeatability, and production rate are superior to commonly used source systems in this engineering depth range class. Compared to hydraulically driven mini-vibrators, which are magnitudes beyond in price class and logistics effort required, the micro-vibrators benefit in performance of field operation and produce less near-offset source generated noise, demonstrated by the ELVIS micro-vibrators. Even without an expensive vibratory source similarity control system, which is required for hydraulic vibrators, the simultaneous operation of several electrodynamic micro-vibrators excite improved signal energy into the subsurface and increases the signal strength significantly. A test using four source devices simultaneously shows up to 50% increased signal amplitude strength and higher signal-to-noise ratio compared to a single device. |
