Sources (We can help)
Timing and Recording
Timing is critical when using recording systems that use absolute time (non-cabled). It is important to understand how to time shots based on source types. Select the link to see available options (explosive initiation systems will require SSF supervision due to liability reasons).
The Chart above shows calculated source energies related to commonly used SSF sources. The actual energy transmitted into the earth will be largely related to the source coupling. Attenuation is related to the medium in which the seismic waves travel. For more information, see link below "Source Comparison and Testing".
This is a sledgehammer hitting a metal plate to induce elastic waves into the ground.
A source attached to a vehicle that uses a spring or high gas pressure to accelerate a mass into a plate coupled with the ground. The displayed source currently not in inventory but may be contracted. The SSF has the A200 P&S source. The specifications can be found in the link below "Learn more about Accelerated Weight Drops".
Uses a blank 8 or 12 Ga shotshell placed underground (~18”) to fire, creating elastic energy.
Explosive sources typically range from 150g to 907kg. They generally require drilling small to large holes depending on shot size. SSF has licensed and credentialed personnel to transport, store and explosives onsite. This lowers large transportation costs and storage issues associated with many projects.
Source Comparison and TestingSource Comparison and Testing
SSF does not contain these sources in the inventory. However, we have agreements with other agencies such as Natural Hazards Engineering Research Infrastructure (NHERI) and New Mexico Institute of Mining and Technology (NMT).
NHERI is located on the University of Texas at Austin campus. The equipment facility is not located on the main campus. However, it is located in Austin, Texas, nearby. They maintain an assortment of P & S vibratory vehicles. Prices and associated costs can be found (here).
NMT is located in Socorro, New Mexico. They have an Industrial Vehicles International (IVI) mini-vibe. This is a trailer-mounted vertical only vibrator with a 4500-lb. force. Water tanks are included on the trailer to add weight. The imaging depth is generally 600 – 800 meters.