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前言许多地震学家和工程师对美国东部的地震感兴趣,他们面临的最为棘手的问题之一,是缺乏仪器观测资料。因此,他们需要利用其他地区——主要是美国西部地区所搜
Introduction Many seismologists and engineers are interested in earthquakes in the eastern United States. One of the most difficult problems facing them is the lack of instrumental observations. Therefore, they need to use other areas - mainly the western United States