Where it comes from
The line in the source
Tohoku (first) | 2011-12-04 | 2017-06-18
Explore / Figure
Record
18 June 2017 Opened 4 December 2011, closed 18 June 2017
EstimateOur model or estimate. Treat it as an order of magnitude.
Found in one pass only. The research team reads every source twice, independently; this record turned up in one reading but not the other, so treat it as less certain than its grade.
The line in the source
Tohoku (first) | 2011-12-04 | 2017-06-18