Open AccessFEATURES OF THE TRAVEL‐TIME CURVES OF SEISMIC RAYS
Author(s) -
Bullen K. E.
Publication year - 1945
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.1945.tb06828.x
Subject(s) - travel time , geology , simple (philosophy) , variation (astronomy) , seismology , geodesy , connection (principal bundle) , geophysics , geometry , mathematics , physics , philosophy , epistemology , astrophysics , transport engineering , engineering
Summary A method is given of deriving the main features of the seismological travel‐time tables from various assumed forms of the ray velocity variation. Attention is drawn to the utility of the functions dΔ/dp / d Δ and Σ in this connection. Attention is also drawn to the utility of the approximate formula v = ar b which is both simple in application and gives very accurate results in parts of the Earth's interior, notably the region between the crustal layers and the level reached by rays for which Δ = 20°.