The latest update from IAEA, excerpt :
" IAEA Briefing on Fukushima Nuclear Accident (13 April 2011, 14:30 UTC)
1. Current Situation
Overall, the situation at the Fukushima Daiichi plant remains very serious but there are early signs of recovery in some functions such as electrical power and instrumentation
There have been no changes concerning the provisional INES Level 7 rating and protective measures as reported in yesterday's brief.
Earthquakes of 11th and 12th April
The IEC received information from the IAEA International Seismic Safety Center on the following recent earthquakes (equal or higher than magnitude Mw= 6.0) which occurred in the time interval from 23:08 UTC on 2011-04-11 to 05:07 UTC on 2011-04-12:
1) At 23:08 UTC, 2011-04-11, an earthquake with a magnitude of 6.2 occurred offshore of the East Coast of Honshu, Japan) at a depth of 13.1 km. Distances from epicentre of the earthquake to NPP sites were: 188 km to Tokai, 217 km to Fukushima Daini, 229 km to Fukushima Daiichi, 236 km to Hamaoka and 285 km to Kashiwazaki-Kariwa.
2) At 05:07 UTC, 2011-04-12, an earthquake with a magnitude of 6.0 occurred inland east of Honshu, Japan at a depth of 10.6 km. Distances from epicentre of the earthquake to NPP sites were; 46 km to Fukushima Daini, 53 km to Fukushima Daiichi, 72 km to Tokai, 165 km to Onagawa and 179 km to Kashiwazaki-Kariwa.
NISA press release regarding the earthquake which occurred on 12th April, states that there was no effect on the following NPP sites: Fukushima Dai-ichi, Fukushima Dai-ni, Tokai Dai-ni, Onagawa. Other nuclear related facilities (Mitusubishi Nuclear Fuel, Nuclear Fuel Industries Ltd., JAEA Tokai & its recycling plant) in Tokai area were reported to be safe by their respective operators."