A low QScS anomaly near the South Pacific Superswell

Details A low QScS anomaly near the South Pacific Superswell A low QScS anomaly near the South Pacific Superswell

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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