Note that the locations of the 08/05/1897 and 06/05/1898 events were very close. We
certainly wish the measures were more exact. Even so, the odds of two 8+ earthquakes
on the same day are horrible (1 in 2 trillion). More than one pair?!   
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Date
Richter
Latitude
Longitude
Depth
04/25/1843
8.3
41.80
144.80
40
04/25/1843
8.2
44.70
149.70
40
02/07/1897
8.3
40.00
140.00
60
08/05/1897
8.7
38.00
143.00
60
04/22/1898
8.3
39.00
142.00
60
06/05/1898
8.7
38.00
143.00
60
08/09/1901
8.2
40.00
144.00
60
12/07/1944
8.3
33.70
136.00
25
12/20/1946
8.3
33.00
135.60
30
05/16/1968
8.1
40.90
143.40
9
05/16/1968
8.0
41.50
142.70
33
         
42 total events
       
since 648 AD