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Seismic anisotropy beneath the Lau back‐arc basin inferred from sScS‐ScS splitting data
Author(s) -
Iidaka Takashi,
Niu Fenglin
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 - 10.1029/2000gl012030
Subject(s) - geology , anisotropy , shear wave splitting , seismology , structural basin , seismic anisotropy , mantle (geology) , geophysics , geomorphology , physics , optics
We determine upper mantle anisotropy just beneath active basins by comparing ScS and sScS waveform splitting. We have measured sScS‐ScS shear‐wave splitting with data from the SPANET and GSN seismic networks. The observed sScS‐ScS shear‐wave splitting suggests that there is a large lateral variation of anisotropy beneath the Lau back‐arc basin. ScS‐ and sScS‐waves which sample the southern part of the Lau basin show small splitting. In contrast, the northern part of the Lau basin, which is characterized to be tectonically active, is observed to have large seismic anisotropy with a WNW‐ESE direction. The cause of anisotropy may be related to the mantle dynamics of the active basin.