Score compares the count of natural-event detections over the last 7 days against the per-week average from the trailing year.

• 100 = exactly average
• < 90: quieter than usual (cyan)
• 90–110: normal (amber)
• 110–140: elevated (orange)
• > 140: spike — much busier than usual (red)

Source: NASA EONET. Recomputes on every filter change.