Physics
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28..391s&link_type=abstract
Geophysical Research Letters, Volume 28, Issue 2, p. 391-394
Physics
1
Seismology: Body Wave Propagation, Seismology: Core And Mantle, Tectonophysics: Dynamics Of Lithosphere And Mantle-General, Tectonophysics: Dynamics, Convection Currents And Mantle Plumes
Scientific paper
We analyzed multiple ScS waves from Tonga-Fiji deep events recorded at the IRIS and SPANET broadband stations to determine lateral variation in attenuation (Q) of the mantle in the South Pacific. We measured average Q values of ScS waves in the mantle between earthquakes and each station, and between two stations. The results of the measurement show that the average Q in the South Pacific is 140. We obtain a very low Q of 70-80 for multiple ScS waves traveling in the South Pacific Superswell, suggesting the existence of higher temperature anomalies in the entire mantle in hot spot regions.
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