Open AccessThe Use of Amplides in Improving Velocity Distributions for Europe
Author(s) -
Jeffreys Sir Harold,
Shimshoni M.
Publication year - 1966
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.1966.tb03077.x
Subject(s) - geology , seismology , geodesy , distribution (mathematics) , amplitude , series (stratigraphy) , mathematics , physics , optics , mathematical analysis , paleontology
Summary Data on amplitudes for P and S in European earthquakes, given by Vanek & Stelzner, are analysed and applied to the times of travel. For P they appear to give a great improvement in estimation of dt/dΔ and hence in the distribution of velocity. The evidence is unfavourable to the existence of a layer of low velocity for P in Europe. For S the results are much less satisfactory, apparently on account of errors in the present travel times, but the material should be useful when these are improved. One earthquake has a remarkable series of P observations to beyond 100°. Comparison with previous data for European earthquakes suggests reductions of travel times by 1s or more beyond 50°.