P-wave velocity anomalies in the earth's mantle from the Uppsala array observations |
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| Authors: | Ota Kulhánek R James Brown |
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| Institution: | (1) Seismological Institute, Box 517, S-751 20 Uppsala, Sweden;(2) Department of Earth Sciences, The University of Manitoba, R3T 2N2 Winnipeg, Canada |
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| Abstract: | Summary Distribution of compressional-wave velocities in the mantle is determined fromdT/d measurements using the Uppsala seismograph array station (UPSAS). Short-period vertical-component seismograms from 181 events in the epicentral distance range 16°–100° have been used. The velocity distribution shows anomalous variations at depths of 750, 1500, 1800, 2300 and 2550 km. Evidence of lateral heterogeneity beneath the northern part of the Asian continent, in the depth range 1700–2300 km, is discussed. Computed travel times, based on this velocity-depth relation, are tested by an examination of travel-time residuals from the Long Shot and Milrow explosions on Amchitka, Aleutian Islands. |
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