Regional travel times ofPandSseismic waves between Fiji and New Zealand
作者:
M.J. Randall,
期刊:
New Zealand Journal of Geology and Geophysics
(Taylor Available online 1971)
卷期:
Volume 14,
issue 1
页码: 133-152
ISSN:0028-8306
年代: 1971
DOI:10.1080/00288306.1971.10422467
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Three years' observations of Tonga-Fiji-Kermadec earthquakes at stations in New Zealand have been analysed by the statistical techniques applied to Herrin's “1968 Seismological Tables forPPhases”, to yield smoothed regional travel times forPandS. The travel-time curve forPis later than Herrin's until it merges with it at about 30°, implying lower velocities than those of Herrin's model at shallow levels in the upper mantle, and higher velocities at deeper levels. The travel-time curve forScrosses the Jeffreys-Bullen curve at 21° and 27° and has a greater curvature in this range. A correlation between the isostatic gravity anomaly and the mean travel-time residual at the stations is tentatively explained in terms of higher velocities in the deep seismic zone.
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