A massive 8.9-magnitude earthquake, the biggest in 300 years in Japan, surpassing the Great Kanto quake of 1923, has hit the north-east of Japan, causing a four-metre tsunami along parts of the country’s coastline. It has killed thousands, sparked fires in several areas including Tokyo and in nuclear reactors, and resulted in extensive damage in the north of the country. Are you in Japan? Has the earthquake affected you? Send us your comments.