(geology) the probability that an earthquake will generate a level of ground motion that exceeds a specified reference level during a given exposure time; "the concept of exceedance can be applied to any type of environmental risk modeling" 地震が所定の露出時間の間、指定された参照レベルを上回る地上運動のレベルを生み出すという可能性。
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【上位】 a measure of how likely it is that some event will occur; a number expressing the ratio of favorable cases to the whole number of cases possible; "the probability that an unbiased coin will fall with the head up is 0.5" ある出来事がどれくらい起きる可能性があるかの測定。全ての可能性のある状況の数に対して良好である状況の比率を表している数。
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