A powerful 7.3-magnitude earthquake struck Japan on Wednesday night, prompting a tsunami advisory for some areas on the northeast coast.

Preliminary details showed that only small tsunami waves were hitting the coast after an advisory warned of waves up to one meter in the Fukushima and Miyagi regions.

The quake, which happened under the sea at 11:36 pm at a depth of 60 km, caused temporary power outages that struck more than two million households. It also came only days after Japan marked the 11th anniversary of the massive quake in 2011 that caused a deadly tsunami and the Fukushima nuclear disaster.

SHOCKING: Huge flashes seen in the sky as 2 million homes in #Japan left without power after 7.3 earthquake pic.twitter.com/CfjXcb5Lmv

— GBN (@GBNfeed) March 16, 2022

"Calls have been inundating police and ambulances in Fukushima and Miyagi," government spokesperson Hirokazu Matsuno told reporters. "We're doing our best to assess the extent of the damage." 

Japan's nuclear authorities said the Fukushima plant was not experiencing any abnormalities.

As for material damage, there was some structural damage in the country's northeast, and a bullet train derailed north of Fukushima city.

No anomaly at the #Fukushima nuclear power plant, in #Japan 🇯🇵, following a 7.3 Magnitude #Earthquake.#Tsunami alert branched out: expect waves at least 1 meter high.😨 pic.twitter.com/yyb5drQd77

— 10LOL (@TenLaughter) March 16, 2022