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| date | stage name | temperature range (°C) | cooperative prevention and control measures |
|---|---|---|---|
| 3.1–3.4 | normal | <30–40 | dynamic advancement |
| 3.5–3.6 | gray alert | >30–40 | dynamic advancement ∩{seal blockage ∪ inert gases injection} |
| 3.6–3.7 | blue alert | >50–60 | dynamic advancement ∩{seal blockage ∩ inert gases injection} |
| 3.8 | gray alert | >30–40 | dynamic advancement ∩{seal blockage ∪ inert gases injection} |
