How prepared is Japan for earthquakes of this magnitude?

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Japan's Preparedness for Magnitude 6.0 Earthquakes

Japan experienced a magnitude-6.0 earthquake off its Fukushima region on April 4, with the epicentre located 40 kilometres deep. This tremor was also felt in Tokyo. The operator of the Fukushima nuclear power plant, Tepco, reported no abnormalities at the facility or other plants in the area following the event.
Building Standards and Seismic Activity

Japan maintains stringent building standards intended to ensure structures can withstand significant seismic events. The country is highly tectonically active, experiencing approximately 1,500 earthquakes annually, though most are minor. These strict regulations are a long-standing feature of construction in the archipelago, a nation situated on the Pacific Ring of Fire.
Response to the April 4 Earthquake

Following the April 4 earthquake, no tsunami warning was issued by the Japan Meteorological Agency. Initial reports indicated no immediate damage or injuries. Tepco confirmed that its nuclear facilities, including the Fukushima Daiichi plant, did not detect any anomalies. The earthquake's magnitude was reported as 6.0 by the Japan Meteorological Agency and 6.1 by the United States Geological Survey.
Historical Context of Seismic Events

The archipelago has a history of powerful earthquakes, including the magnitude-9.0 undersea quake in March 2011 off the northeast coast. That event triggered a devastating tsunami, resulting in approximately 18,500 deaths or disappearances and causing meltdowns at three reactors at the Fukushima nuclear plant. The scale of that disaster, Japan's worst post-war catastrophe and the most severe nuclear accident since Chernobyl, highlights the nation's ongoing challenges with seismic and related risks.

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How prepared is Japan for earthquakes of this magnitude?

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