A Japanese government committee on earthquake research has changed its estimate of the chance of a Nankai Trough megaquake in the next 30 years to around 80 percent, from the previous 70 to 80 percent ...
Though Monday's temblor struck a similar area to one in August that sparked the first advisory, no such alert was issued.
Japan's nuclear plants faced global scrutiny after the devastating 2011 tsunami triggered by a 9.0 magnitude earthquake.