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A Low Q ScS Anomaly Near the South Pacific Superswell
Author(s) -
Suetsugu Daisuke
Publication year - 2001
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2000gl012224
Subject(s) - geology , mantle (geology) , attenuation , seismology , pacific ocean , anomaly (physics) , geophysics , oceanography , physics , condensed matter physics , optics
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.