Seismic anisotropy beneath the Lau back‐arc basin inferred from sScS‐ScS splitting data
Seismic anisotropy beneath the Lau back‐arc basin inferred from sScS‐ScS splitting data
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DOI：
10.1029/2000gl012030
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发表时间：
2001-03
影响因子：
5.2
通讯作者：
T. Iidaka;F. Niu
中科院分区：
文献类型：
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作者：
T. Iidaka;F. Niu
我们通过比较南海和南海的波形分裂来确定活动盆地下的上地幔各向异性。我们利用SPANET和GSN地震台网的数据测量了ssc - ScS剪切波分裂。观测到的sScS - ScS剪切波分裂表明，在劳弧后盆地下存在较大的各向异性横向变化。在劳盆地南部取样的sc -和ssc -波显示出小的分裂。而在构造活跃的劳盆地北部，地震各向异性较大，呈WNW - ESE方向。各向异性的成因可能与活动盆地的地幔动力学有关。
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.