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High‐frequency Pn,Sn phases recorded by ocean bottom seismometers on the Cocos Plate
Author(s) -
McCreery Charles S.
Publication year - 1981
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/gl008i005p00489
Subject(s) - geology , seismometer , seismology , ridge , crest , mid ocean ridge , pacific ocean , plate tectonics , lithosphere , indian ocean , oceanography , paleontology , optics , tectonics , physics
Data from ocean bottom seismometers located on the Cocos plate indicate that high‐frequency Pn,Sn phases are generated by earthquakes along the subducting margin of that plate and are propagated across the plate. The Sn phase appears to be severely attenuated as it approaches the ridge crest. Estimates of Pn velocity are lower than previous estimates for western Pacific paths, which may indicate a relationship between Pn,Sn velocity and lithospheric age. High frequencies found in these phases suggest that Q for Pn,Sn propagation across the Cocos plate is similar to that for the western Pacific.