A powerful 7.5 magnitude earthquake off Japan’s northeastern coastline has triggered widespread tsunami alerts, Reuters reports.
Authorities urgently advised residents on Monday to steer clear of the shoreline as forecasters predicted waves reaching up to three metres in height.
Tsunami alerts and immediate response
The earthquake occurred at 16:52 local time. Roughly two hours later monitoring stations recorded waves measuring 80 centimetres. However meteorologists maintained active alerts for the northern Hokkaido region and the upper areas of Honshu island amid fears that significantly larger swells could still make landfall.
Top government spokesperson Minoru Kihara addressed the media as evening approached in Tokyo to confirm that there were currently no reports of severe structural damage, injuries or fatalities.
Despite the lack of immediate casualties proactive safety measures were swiftly implemented. Public broadcaster NHK reported that evacuation directives were issued for thousands of individuals in coastal communities like Kamaishi and Otsuchi.
Both of these port towns suffered catastrophic damage during the devastating 2011 disaster. The tremor also caused widespread disruption to the domestic transport network with regional motorways shut down and bullet train services temporarily suspended.
Seismic impact and nuclear safety
Officials from the Japan Meteorological Agency (JMA) warned the public to prepare for substantial aftershocks over the coming days and weeks. The JMA stated the earthquake originated at a shallow depth of 10 kilometres beneath the Pacific Ocean.
It registered as an ‘upper 5’ on the national seismic intensity scale which indicates tremors severe enough to topple unreinforced masonry walls, hinder human movement and cause significant distress. The agency cautioned that a three-metre tsunami possesses enough force to inundate low-lying buildings and sweep away anyone caught in its currents.
Japan sits directly on the volatile Pacific Ring of Fire and experiences roughly a fifth of all global earthquakes measuring 6.0 or higher. While the nation is highly accustomed to seismic activity the horrors of the 2011 disaster which triggered meltdowns at the Fukushima power plant, remain fresh in the public consciousness.
Fortunately energy companies have reassured the public regarding current safety levels. There are no active nuclear power plants in the immediate vicinity of the tremor and both Tohoku Electric Power and Hokkaido Electric Power confirmed that their idled facilities in the affected zones reported no operational abnormalities.
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