The　optimum　source－time　function　for　generating　finite－difference　synthetic　seismograms  

作　　者：Abdolrahim JAVAHERIAN(Institute of Geophysics,the University Of Tehran, P.O.Box 14155-6466 Tehran,Islamic Republic of Iran) 

出　　处：《Acta Seismologica Sinica(English Edition)》1994年第1期23-31,共9页

摘　　要：A source-time function plays an important role in generating finite-difference synthetic seismograms.In this regard,we consider the amplitude spectra of five different time functions.This investigation shows that when the high-frequency signals of the time function carry more power than the main signal,the tailing phenomena would be associated with the main signal which is not desirable in producing finite-difference synthetic seismograms.It is illustrated that the time function denoted by is the optimal source-time function among those examined in this paper for generating finite-difference synthetic seismograms.This matter is also verified by making finite-difference synthetic seismograms over an elastic earth model consisting of a layer over a half space.A source-time function plays an important role in generating finite-difference synthetic seismograms.In this regard,we consider the amplitude spectra of five different time functions.This investigation shows that when the high-frequency signals of the time function carry more power than the main signal,the tailing phenomena would be associated with the main signal which is not desirable in producing finite-difference synthetic seismograms.It is illustrated that the time function denoted by is the optimal source-time function among those examined in this paper for generating finite-difference synthetic seismograms.This matter is also verified by making finite-difference synthetic seismograms over an elastic earth model consisting of a layer over a half space.

关 键 词：source-time function FINITE-DIFFERENCE synthetic seismograms 

分 类 号：P315[天文地球—地震学]