Analysis of earthquakes in the distance range 40-70° and inferred lower mantle structure

Details Analysis of earthquakes in the distance range 40-70° and inferred lower mantle structure Analysis of earthquakes in the distance range 40-70° and inferred lower mantle structure

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pepi...28..242r&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 28, Issue 3, p. 242-250.

Physics

1

Scientific paper

About fifty earthquakes in the distance range 40-70° and azimuthal range 45-120° from the Celebes, Philippines, Mariana and Kurile Island regions, and recorded at Gauribidanur seismic array in southern India, were used in the present study. Measurements on slowness and apparent azimuths were made on the first 30 s of the short period P-wave trains using an adaptive processing technique. Analysis of this data set has revealed no strong evidence for any triplications in the travel-time curve over the ranges in question. The P-wave velocity increases continuously with an almost uniform gradient below 1000 km depth range and is in very close agreement with the JB model. Almost all the observed slowness values of the events were anomalously low and consistent suggesting that they are caused by some azimuthal dependent structure near the array.

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