Magnitude 7.1 Earthquake off the coast of Fukashima Prefecture, Japan.

The Japan Meteorological Agency recorded a Magnitude 7.1 Earthquake at a depth of about 60 km, about 70 km off the east coast of Fukashima Prefecture, on Honshū Island, slightly before 11.10 pm Japan Standard Time (slightly before 2.10 pm GMT) on Saturday 13 January 2021. The event was felt across much of eastern Japan, and though there are no reports of any serious damage or casualties, many people were left without power and many reports of minor damage following the event.

 

Damage caused by a Magnitude 7.1 Earthquake off the coast of Fukashima Prefecture, Japan, on 13 February 2021. Kyodo News.

Japan has a complex tectonic situation, with parts of the country on four different tectonic plates. Eastern Honshū area lies on the boundary between the Pacific, Eurasian and Philippine Plates, where the Pacific Plate is passing beneath the Eurasian and Philippine Plates as it is subducted into the Earth. This is not a smooth process; the rocks of the two plates constantly stick together, only to break apart again as the pressure builds up, causing Earthquakes in the process.

 

The movement of the Pacific and Philippine Plates beneath eastern Honshū. Laurent Jolivet/Institut des Sciences de la Terre d'Orléans/Sciences de la Terre et de l'Environnement.

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