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本文利用四川峨嵋水泥厂矿山自1971年以来的18次工业爆破资料,探讨了四川部分地区近十一年来的地震波速(视波速)的变化特征。本文对Smith所提出的“走时差”法作了某些改进,使之不仅适合于分析折射首波,也适合分析直达波。讨论了四川地区地震波速的各向异性特征.还利用另外的3次大爆破,用时间项法测定了西南部分地区的地壳厚度.
Based on 18 industrial blasting data of Emei Cement Mines in Sichuan since 1971, this paper explores the characteristics of the seismic wave velocity (apparent velocity) in some areas of Sichuan in recent eleven years. In this paper, we make some improvements to the “walking-time difference” method proposed by Smith, making it not only suitable for analyzing the refracted first wave but also for analyzing the direct wave. The anisotropy of seismic wave velocity in Sichuan area is discussed, and another three times of large-scale blasting are used to determine the crustal thickness in some parts of southwestern China using the time-term method.