Physics
Scientific paper
Dec 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...41....6d&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 41, Issue 1, p. 6-17.
Physics
7
Scientific paper
P and PP travel-time residuals have been collected from 23 quarters of the regional catalog of earthquakes of the International Seismological Centre (ISC). The difference in travel-time residuals between PP and P are used as an indicator of the P-delay time near the PP reflection point. Global maps of these differential travel-time residuals are used to study lateral heterogeneity in the crust and upper mantle. Two of the regions studied have mean differential travel-time residuals significantly different (at greater than the 95% confidence level) from the global mean of the differential travel-time residuals. In the central Pacific, southeast of Hawaii, differential PP - P travel-time residuals of - 3.8 +/- 0.36 s are observed. These observations imply an average P-delay time of - 1.1 +/- 0.38 s. Average P-delay times of 0.67 +/- 0.20 s are observed beneath the Tibetan Plateau and the western portion of the People's Republic of China. These travel-time variations basically agree in location and sign with the surface wave results of Tanimoto and Anderson.
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