April 2011 Fukushima earthquake
  11 March quake
 Tokyo
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| Date | 11 April 2011 (+09:00) |
|---|---|
| Origin time | 17:16:13 |
| Magnitude | 6.6 Mw |
| Depth | 13 km (8 mi) |
| Epicenter | 37°00′25″N 140°28′37″E / 37.007°N 140.477°ECoordinates: 37°00′25″N 140°28′37″E / 37.007°N 140.477°E |
| Type | Dip-slip |
| Areas affected | Japan |
| Max. intensity | VIII (Severe) |
| Tsunami | No |
| Landslides | Yes |
| Casualties | 4 dead, 10 injured |
The April 2011 Fukushima earthquake (福島県浜通り地震 Fukushima-ken Hamadōri jishin?, lit. "Fukushima Hamadōri earthquake") was a potent magnitude 6.6 Mw intraplate aftershock that occurred at 17:16 JST (08:16 UTC) on 11 April in the Hamadōri region of Fukushima, Japan. With a shallow focus of 13 km (8.1 mi), the earthquake was centred inland about 36 km (22 mi) west of Iwaki, causing widespread strong to locally severe shaking. It was one of many aftershocks to follow the 11 March Tōhoku earthquake, and the strongest to have its epicentre located inland.
The earthquake occurred as a result of normal faulting to the west of Iwaki and triggered numerous landslides across adjacent mountainous areas. A few fires broke out, and 220,000 households lost electricity. Officials issued localised tsunami alerts, though no significant waves were generated. The earthquake caused little structural damage, but killed four people and injured ten others. The strong ground movements triggered the reactivation of a nearby geological fault, prompting researchers to conduct extensive surveys in the region.
The magnitude 6.6 Mw Fukushima Hamadōri earthquake occurred inland on 11 April 2011 at 08:16 UTC at a focal depth of 13 km (8.1 mi), about 36 km (22 mi) west of Iwaki, Fukushima, or 161 km (100 mi) north-northeast of Tokyo. To the east of the epicentre, the oceanic Pacific Plate is subducted beneath the continental Okhotsk Plate, on which much of Honshu's Tōhoku region is situated. Building stress near the resultant plate boundary has led to the development of shallow inland faults through crustal deformation and folding along the east coast of Tōhoku. This intraplate earthquake occurred in the vicinity of the Idosawa Fault – a shallow crustal fault in the Hamadōri region near Tabito town, Iwaki city, that had previously been inactive.
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