Tomographic study of upper mantle attenuation in the Pacific Ocean

Details Tomographic study of upper mantle attenuation in the Pacific Ocean Tomographic study of upper mantle attenuation in the Pacific Ocean

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20..663b&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 8, p. 663-666.

Other

13

Earth Mantle, Earthquakes, Rayleigh Waves, Seismograms, Wave Attenuation, Maps, Mathematical Models, Pacific Ocean, Tomography

Scientific paper

The quality factor Q has been measured in the Pacific Ocean along many paths using long period seismograms of the Geoscope and IDA networks. The Love and Rayleigh phase velocity and Q(R) exp -1 have been regionalized in the period range 60s to 200s, and then simultaneously inverted at depth to obtain 3D images of S-wave velocity and attenuation Q(beta) exp -1 in the depth range 60-300 km. Up to 100s, three very attenuating zones appear, one under the East Pacific Rise, another one around Hawaii, a third one east of Kermadec. By inversion, those three anomalies are found stable down to 160 km. Below 200 km, lateral variations are less intense and differently distributed; the maximum attenuation seems to concentrate along a northeast trend in the North Central Pacific.

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