...
Conclusion It is not the site RIKEN that has gone bad, rather it is some of the routes
RIKEN Looking at Japan
Japanese hosts seen from JP.RIKEN.N3 (RIKEN) see no impact on RTT
...
However on 3/22/2011 the route to RIKEN went westwards across the Pacific and the RTT was very stable with Min/Avg/Max/Stdev 131.985/132.173/132.607/0.443 ms for 148 pings. The routes to the University of OSAKA and the University of TOKYO were similar.