Southwest Regional Drager BG4 Exam Taken from the 2019 Southwest Regional Mine Rescue Contest held in Ruidoso, New Mexico
Progress Indicator:
 
Question 5 of 30
5. Shaking of the ground, by elastic waves emanating from a blast, usually measured in inches per second of particle velocity.
Choices:
- Explosive Strength
- Ground Vibration
- Signs-Explosive (Placards)
- Hangfire
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