| Date and Time: | 11 April 2011 17:16 JST (08:16 UTC) |
| Magnitude: | 7.0 (interim value) |
| Hypocenter: | N36.9, E140.7 (Iwaki-City) Depth 6km (interim value) |
| Mechanism: | Normal fault type with ENE-WSW tension axis (by first motion mechanism analysis) |
| Earthquake Early Warning: | Issued 6.3 seconds after the detection of the first P-wave at the nearest seismic station |
| JMA Seismic Intensity: |
| 6- (Max) |
Nakajima Town, Furudono Town, Iwaki City in Fukushima Prefecture, Hokota City in Ibaraki Prefecture |
| 5+ or weaker |
Observed nationwide from Hokkaido to Kinki |
|
| Tsunami Warnings and Advisories: |
| Date and Time |
Action |
Number of Areas (Total : 66 areas) |
Warning
(3m or higher) |
Warning
(Up to 2m) |
Advisory
(About 0.5m) |
| 11 April 2011 17:18 JST (08:18 UTC) |
Issued |
0 |
1 |
3 |
| 11 April 2011 18:05 JST (09:55 UTC) |
Lifted |
0 |
0 |
0 |
|
| Observed Tsunami: |
None |
A strong earthquake of magnitude of 7.0 occurred Monday 11 April.