How did the annual count of definite oceanic tsunamis recorded worldwide change from 1985 to 1999?
This is a real historical chart. Extraplot shows you the beginning and asks you to draw what happens next, then reveals the actual line. Below is the full series with the reveal point marked.
Solid line = visible part you would draw from · dashed violet = the actual revealed data after the cutoff.
The reveal
After the cutoff (1990), the actual values were:
| Date | Actual value |
|---|---|
| 1991 | 5 |
| 1992 | 7 |
| 1993 | 6 |
| 1994 | 16 |
| 1995 | 16 |
| 1996 | 15 |
| 1997 | 5 |
| 1998 | 4 |
| 1999 | 4 |
About this dataset
- Category: Earth Science
- Source: NOAA NCEI (Global Historical Tsunami Database)
- Date range: 1985 – 1999
- Data points: 15
- Source fetched: Nov 10, 2026
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