科学家根据地震波的强度和持续时间把地震强度分为了不同的等级。
Scientists assign a magnitude rating to earthquakes based on the strength and duration of their seismic waves.
在今天早上袭击日本的8.9级的地震是强度最大的板块叠加的结果：几个专家称他们可以推断出在日本最近的一次相似烈度的地震发生在公元869年。
The shock of the magnitude-8.9 earthquake that hit Japan this morning was its sheer intensity: Several experts have hypothesized that the last one of this magnitude struck Japan in 869 C. E.
在今天早上袭击日本的8.9级的地震是强度最大的板块叠加的结果：几个专家称他们可以推断出在日本最近的一次相似烈度的地震发生在公元869年。
The shock of the magnitude-8.9 earthquake that hit Japan this morning was its sheer intensity: Several experts have hypothesized that the last one of this magnitude struck Japan in 869 c.e..
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