Travel-time residuals of PP waves reflected under oceanic and continental platform regions

Details Travel-time residuals of PP waves reflected under oceanic and continental platform regions Travel-time residuals of PP waves reflected under oceanic and continental platform regions

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pepi...23..199g&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 23, Issue 3, p. 199-206.

Physics

4

Scientific paper

PP waves have been used to transform PP residuals with respect to Jeffreys-Bullen time into P-wave travel-time delays close to the reflection point. It is found that P-wave travel-time delays decrease with the age of the plate for oceanic structures. Average oceanic lithosphere (100 My) has a residual similar to that of a typical continental platform (Siberia). The absence of a P-wave low velocity zone under platform regions is sufficient to explain the small difference in residuals between old oceanic regions and the Siberian platform. Thus, from these observations, there is no evidence that would favour a substantial structural difference between continents and oceans at depths greater than 250 km.

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