Industry Survey - Evacuations, Exclusions and Re-entry Practices
This survey hopes to gather information regarding current industry practices and gauge demand for additional research and development in the area of evacuation, exclusion and re-entry protocols.
Name, operation, company: (Optional)
For follow up purposes only
Our site regularly implements an exclusion zone in the event of? (check all that apply)
Production blast indicates all major firings. Other hazard indicators may be CAV/EI, ASR etc. Only check boxes if this has occurred more than a couple of times (not just one off occasions)
Large Event (over +1.0 Richter)
Significant Event (over 0.0 Richter)
Elevated activity rate (not associated with above)
Other hazard indicators
How do you determine the area of exclusion?
Standard spherical radius for majority of cases
Review of spatial distribution of previous responses
Case-by-case, heavily dependent on current mining areas
Once an exclusion zone has been implemented, the decision to re-enter is based on?
Blanket rule (fixed exclusion period based on historic data, rarely modified)
Blanket rule + review (minimum exclusion, regularly modified based on observed activity)
Variable based on specific rules (e.g. once activity rate/ASR drops below XX)
Variable based on general rules (look at chart trends in various seismic parameters e.g. CAV/EI, omori decay)
If you use blanket exclusions, how did you arrive at the period of exclusion?
Review of previous responses, systematic approach (time to delayed significant event, 90% rule)
Review of previous responses, general approach (omori analysis, rate roughly back to background)
Site experience and judgement based
Nominal exclusion period only
Please briefly describe your process for reviewing data before re-entry, your specific rules for re-entry or the general trends you look for (and which charts, parameters if applicable)
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