The 8.9 magnitude earthquake on Friday, the largest ever recorded in Japan, occurred in a subduction zone, where one of the earth’s tectonic plates is sliding beneath another.
Even without landslides, post-earthquake pictures show collapsed houses sliding downhill.
即使没有滑坡，震后照片现实垮塌的房屋顺山坡滑下。
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An improved sequential pattern mining algorithm is proposed, which is based on sliding time window and can discover general earthquake sequences according to field knowledge.