There’s a whole lot of methods that can be used in conducting geophysical surveys. One of the most popularly used methods by experts in geophysics in Perth is the seismic method. The seismic techniques normally involve placement of geophones in strategic patterns in order to provide data about the properties of rocks in the area several miles underneath the earth. Seismic techniques provide detailed data about the subsurface layering and rock geomechanical properties using seismic acoustical waves. The seismic acoustical waves are made by inducing vibration using small explosive or truck-mounted vibrating weights.
There are two types of seismic surveys, the active and the passive survey. The active seismic survey involves artificial or man-made source in order to generate signal such as blasting caps and explosives, sledgehammer and steel plate placed on the ground, accelerated weight-drop source, land air gun, vibrosies source, etc. This artificial or man-made source will produce vibrating signals that penetrates the subsurface. The signal will be modified depending on the characteristics of materials in the subsurface which the signal will travel. These signals will be measured by the detectors such as Soilspy Rosina wherein the output can be collected, displayed and interpreted.
On the other hand, the passive seismic method is less destructive and non-invasive since it utilizes the natural signal generated by the earth’s surface such as magnetic field and gravitational fields. Specialized seismic detectors such as Soilspy Rosina can detect the variations of these fields. It can record, display and geologically interpret the data.
The Soilspy Rosina is an advanced technology for geophysical survey developed by MoHo s.r.l, and it is intended for active and passive seismic surveys. It is a multichannel digital system that has many unique features.
Unique Features of SoilSpy Rosina
Improved Recording Quality: The quality of signal produced does not degrade along the cables, it has high signal-to-noise ratio than any similar analog system seismic devices, no cross-talk in the cables and it has precise synchronization of all the channels.
No External Battery: The device does not require external battery since it gets its power through USB port that can be connected directly to a PC or laptop.
Extreme Lightness: The device weighs less than 200 g per module plus its 5 m cable, for a standard 12 channel systems it approximately weighs around 2.4 kilograms excluding the geophones.
Unlimited Recording: Practically, there is no limit in recording the data. The length of the recording will depend on the storage capacity of your PC.
Threshold Triggering: Each and every channel can be set as a trigger channel. With this device, you don’t need a separate trigger cable.
Stacking /Phase Inversion/Averaging: Unique routine for the revision of stacks and operations on them.
Integrated Internal Test: Test can be made to verify that every channel is functioning correctly.
Modularity: You can link several SoilSpy Rosina devices to create a unique deployment.