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引言我们把各种地震波最初到达地震台的波相称为震相。震相在地震学中的意义是,表示不同性质的地震波,或性质相同但传播经历不同的地震波在地震图上的表现。从观测中发现的震相种类以及理论上预见的震相种类是十分众多的。地震图上还有不少未知震相,一方面应当继续不断地探讨各种已知震相的利用方法,以便更充分地利用它们;另一方面必须继续发现新震相,解释其性质,进而探讨其实用价值,这是观测地震学的重要课题,亦是我们地震台站观测人员和资料分析处理人员当然的任务。本文就国际上对于ScSp震相的发现和该震相的特征以及利用ScSp震相测定岩石圈板块俯冲带的边界予以浅谈,以供借鉴。
INTRODUCTION We regard the waves that initially reach the seismostation of various seismic waves as phases. Seismic facies in seismology means that seismic waves of different nature or of seismic waves of the same nature but different propagation experiences are represented on the seismogram. The types of seismic facies found from observations and the types of seismic phases theoretically predicted are quite numerous. There are still many unknown seismic phases on the seismogram. On the one hand, we should continue to explore ways to utilize various known seismic phases in order to make fuller use of them; on the other hand, we must continue to discover new seismic facies, explain their nature, Explore its practical value, which is an important topic in observational seismology, and of course the task of observers and data analysis and processing personnel at our seismological stations. In this paper, the discovery of the ScSp facies in the world and the characteristics of the facies facies and the determination of the boundary of the lithospheric subduction zone by the ScSp facies are briefly introduced for reference.