Evidence for P wave velocity discontinuities at depths greater than 650 km in the mantle

Details Evidence for P wave velocity discontinuities at depths greater than 650 km in the mantle Evidence for P wave velocity discontinuities at depths greater than 650 km in the mantle

Dec 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980pepi...23..304m&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 23, Issue 4, p. 304-313.

Physics

10

Scientific paper

The arrival times of seismic P waves recorded at long lines of portable seismographs deployed on the shield region of central Australia show evidence of breaks in the travel-time curve at epicentral distances near 30, 39 and 43°. These breaks are additional to those at about 20 and 24° (associated with the 400- and 650-km discontinuities) and imply that the P wave velocity structure of the mantle does not increase smoothly in the depth range 650-1100 km, but rather consists of regions of nearly constant velocity separated by small but significant velocity increases at depths of approximately 770, 980 and 1080 km. These conclusions are in agreement with those previously inferred from first and later arrivals at the Warramunga Seismic Array.
Now with Geosciences Program, University of Texas at Dallas, Dallas, TX, U.S.A.

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