周日晚间日本附近海底曾发生地震，美国地质调查局测定的震级为7.1级。

An earthquake measured at 7.1 by the U.S. agency struck Sunday night, centered off the coast of Japan.

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这场地震非常强烈，据测定震级为里氏7.9级。 这个级别的地震的确会为建筑带来不可避免的损害。

The earthquake was so powerful, measuring at least 7.9 in magnitude, that a certain amount of damage could not be prevented.

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但周三余震后并没有发生海啸。据美国地质调查局(u.s. Geological Survey)初步测定，余震震级从5.9到6.3级不等。

But no tsunami followed Wednesday's aftershocks, the magnitudes of which ran from 5.9 to 6.3 in preliminary readings by the U.S. Geological Survey.

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