Open AccessA modified first‐motion approximation for the synthesis of body‐wave seismograms
Author(s) -
Mellman George R.,
Helmberger Donald V.
Publication year - 1978
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1978.tb06760.x
Subject(s) - seismogram , motion (physics) , homogeneous , mathematics , geology , mathematical analysis , classical mechanics , physics , seismology , combinatorics
Summary. Modified first‐motion approximations have been developed for the generation of synthetic body‐wave seismograms using the Cagniard‐de Hoop method. Comparisons are presented between classical first motion, modified first motion and full Cagniard treatments for problems involving a homogeneous sphere and a triplication in a realistic earth model. Results of these comparisons show that the modified first‐motion approximations may be used for a wide variety of geophysically interesting problems with little loss of accuracy compared to the full Cagniard method.