A team of government analysis said the risk of an earthquake of 7 and 7.5 striking Japan Trench, off the country’s east coast in the next 30 years is up to 90%. Hirata and his team split Japan Trench into sections. Based on the number of big quakes seen before, the researchers gave a probability of a fresh quake in each section.

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https://www.dailymail.co.uk/news/article-6746653/Japan-highly-likely-hit-large-earthquake-30-years-report-warns.html