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VIBIST-20*
Surface Seismic Source
VIBSIST-20 SURFACE SEISMIC SOURCEDESCRIPTIONThe VIBSIST-20 is based on the Swept Impact Seismic Technique (SIST) which is a combination of the Vibroseis swept-frequency and the Mini-Sosie multi-impact ideas. The seismic signals are produced as a series of pulses, according to a specific pre-programmed sequence which makes the system similar to a smaller Vibroseis. The use of the monotonous variation of the impact rate controls effectively the non-repeatability of the impact intervals and achieves a wide bandwidth even when the coupling to the rock or ground is relatively poor. Using standard construction equipment allows the VIBSIST-20 to become a safe, non-destructive and environmentally friendly high resolution seismic source. It also makes this seismic method reliable and highly cost effective. APPLICATIONSThe VIBSIST-20 can be used in a wide range of applications, they include:
MAJOR BENEFITSEXCELLENT SOURCE FOR HIGH RESOLUTION SEISMIC SURVEYS The VIBSIST-20 is an excellent reflection/refraction source because it obtains equivalent depth or better than would small caps explosive or single pulse sources while maintaining a higher resolution and an increased productivity. The high S/N Ratio is achieved by a signal energy of 10 kJ over a period of 25 seconds or the equivalent of 22 impacts per second. It is the accumulation of these low energy impacts which leads to significant depth penetration. INCREASED PRODUCTIVITY Significant productivity gains are obtained because the VIBSIST-20 hand-held electromechanical hammer is not dependent on the energy of the operator using a sledgehammer or on the lengthy preparation needed to use explosives, such as drilling holes, filling them in, setting up the wires, etc. For refraction applications, the VIBSIST technique is at least 10 times faster than using a sledgehammer and for reflection more than 10 to 20 times faster than using explosives, depending on the operator. With the VIBSIST-20, you can finish the job quite sooner than with alternate methods. HIGHER DATA QUALITY The VIBSIST-20 produces high frequency content (up to 2500 Hz) while achieving significant depth penetration as shown on Figure 1. The high frequency content of the signal emitted by a seismic source tends to decrease when the power of the source increases, which makes higher resolution and wide investigation range difficult to achieve simultaneously. The investigation range can however be increased with little or no expense of resolution if the signal energy is built over time, rather than being emitted as a short high-power burst.
MODULAR AND PORTABLE The reduced number of modules make the VIBSIST-20 portable and highly mobile. It allows jobs to be done faster and in difficult field conditions that would otherwise have been almost inaccessible such as mountainous regions, underground mines, confined areas, etc. ADDITIONAL BENEFITSENVIRONMENTALLY FRIENDLY The VIBSIST-20 is an environmentally friendly seismic source. It is a non-destructive alternative that does not create environmental pollution such as chemicals, sound, etc. Legal risks frequently associated with using explosives are eliminated. MECHANICALLY RELIABLE The VIBSIST-20 incorporates and upgrades standard rock breaker equipment commonly used in the construction industry. The many thousands of impacts per day used by the Swept Impact Technique require a rugged electromechanical hammer that is already well proven and that also meets established environmental (sound) standards. COMPATIBLE WITH MANY SEISMOGRAPHS The VIBSIST can be used with many seismographs. A correlator is required as well a large enough memory per channel. Compatible seismographs include either the GEODE or StrataVisor NZ with their Windows NT operating system for real-time analysis and preferably their 64,000 samples per channel capability or a StrataView with a networking card in a Post-Processing Mode. INTEGRATED WITH TUNNEL TO HOLE AND VSP SURVEYS The VIBSIST-20 is ideal for tunnel to hole and VSP high resolution surveys. It generates enough energy to be used with borehole seismic systems at depth of 400 meters or less. SURFACE WAVE CAPABILITY The VIBSIST-20 can be used to produce and measure surface waves, which can be processed and analyzed. SYSTEM COMPONENTSThe VIBSIST-20 includes the following modules:
The system also includes the necessary cables between the controller, the hammer and the seismograph. SOFTWAREFour software modules are included as part of the VIBSIST-20 system, they are:
SPECIFICATIONS:
Ordering Information
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