Major 7.4-magnitude quake hits off Japan, tsunami warning issued

A powerful 7.4-magnitude earthquake struck off Japan's northeastern coast, triggering tsunami warnings for waves up to three meters and immediate evacuation orders. | Contesto: cronaca

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• Major 7.4-magnitude quake hits off Japan, tsunami warning issued

Contesto

A major earthquake with a preliminary magnitude of 7.4 struck off the northeastern coast of Japan, prompting the Japan Meteorological Agency to issue a tsunami warning for waves as high as three meters (9.84 feet). The quake, which occurred in the Pacific Ocean, immediately triggered urgent evacuation advisories for coastal residents in the prefectures of Iwate, Aomori, and Hokkaido. Authorities urged people to move to higher ground immediately, emphasizing the imminent danger posed by the approaching tsunami. The affected region, known as the Tohoku coast, carries the profound and recent memory of the catastrophic 2011 disaster, when a 9.0-magnitude earthquake generated a massive tsunami that overwhelmed sea walls, caused meltdowns at the Fukushima Daiichi nuclear plant, and left nearly 20,000 people dead or missing. This historical context lent a palpable urgency to today's warnings, with broadcasters and emergency alert systems activating protocols refined in the aftermath of that tragedy. The specific warning for three-meter waves indicates a significant threat to life and property, capable of sweeping away vehicles and destroying wooden structures. Japan's sophisticated early warning systems, which include a dense network of seismic sensors and ocean buoys, likely provided critical seconds to minutes of advance notice. The nation's infrastructure, much of it rebuilt and reinforced to stricter anti-seismic and tsunami-resistant standards since 2011, faced its first major test from a high-magnitude event in over a decade. Initial reports focused on the tsunami threat, with assessments of shaking intensity and structural damage on land expected to follow as the immediate wave danger passes. The earthquake's location in the Pacific Ocean underscores the persistent geological volatility of the region. Japan sits at the convergence of several tectonic plates, including the Pacific Plate, which is subducting beneath the Okhotsk Plate along the Japan Trench. This subduction zone is one of the most seismically active areas on the planet, responsible for generating frequent earthquakes and the constant risk of tsunamis. Today's event, while powerful, is a reminder...

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Categoria: cronaca