A simple method to calculate synthetic long-period seismograms incorporating first-order asymptotics

1988 Journal of Physics of the Earth  
A simple method is suggested to calculate synthetic long-period seismograms by normal mode summation. Effects of the lateral heterogeneity are incorporated by the first-order asymptotics which are valid up to the order of I-1 (l: angular order). Synthetic seismograms of a laterally heterogeneous earth model can be calculated by those of a spherically symmetric earth model with varying frequency, epicentral distance, amplitude, and azimuth.
doi:10.4294/jpe1952.36.229 fatcat:f5v435na7vdz7lox3cahnrygr4