Physics
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pepi...18...27w&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 18, Issue 1, p. 27-33.
Physics
1
Scientific paper
A radial velocity anomaly in the lower mantle may cause a triplication in the travel-time curve for short-period P waves, but the first two arrivals may not be separable visually on seismograms over a distance range of about 4-10°. However, the changes of slowness and azimuth as a function of time can be used to infer the presence of interfering signals. Some of the interference effects that can be generated synthetically are often observed on seismograms of earthquakes recorded at the Yellowknife array at distances close to 50°, 80° and 90°. The data from Yellowknife provide evidence for the presence of regions of high velocity gradients at depths of about 1250, 2400 and 2730 km that also show rapid lateral variations. Numerous P arrivals from South American earthquakes that traverse the lowest 500 km of the mantle beneath the Caribbean region have been used to illustrate the main features of the interference method.
Lyons J. A.
Wright Chris
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