Upper mantle discontinuity structure in the region of the Tonga Subduction Zone
Upper mantle discontinuity structure in the region of the Tonga Subduction Zone
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DOI：
10.1029/2000gl012192
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发表时间：
2001-05
影响因子：
5.2
通讯作者：
H. Gilbert;A. Sheehan;D. Wiens;K. Dueker;L. Dorman;J. Hildebrand;S. Webb
中科院分区：
文献类型：
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作者：
H. Gilbert;A. Sheehan;D. Wiens;K. Dueker;L. Dorman;J. Hildebrand;S. Webb
我们研究了西南太平洋下的地幔结构，以研究汤加板块在深度上的几何形状及其与410和660 km不连续面（以下称为410和660）的相互作用。我们利用从站的劳盆地海底地震记录实验和西南太平洋地震实验的岛屿站的数据。该地区的构造复杂性，包括汤加俯冲带和相关的劳弧后扩张中心，使其成为一个理想的地区，调查上地幔不连续性使用高分辨率技术，如接收器功能的共同转换点叠加。我们制作了汤加俯冲带附近上地幔的高分辨率图像，以显示不连续面和俯冲板片之间的相互作用。我们的研究结果表明，410隆起30公里附近的汤加板和660凹陷20至30公里的热控制橄榄石相变的预期。
We study the mantle structure below the southwest Pacific in order to examine the geometry of the Tonga slab at depth and its interaction with the 410‐ and 660‐km discontinuities (hereafter called the 410 and the 660). We utilize data from stations of both the Lau Basin Ocean Bottom Seismogram experiment and island stations of the Southwest Pacific Seismic Experiment. The tectonic complexity of this region, containing both the Tonga subduction zone and the associated Lau back arc spreading center make it an ideal area to investigate the upper mantle discontinuities using a high resolution technique such as common conversion point stacking of receiver functions. We produce a high‐resolution image of the upper mantle near the Tonga subduction zone to show the interaction between the discontinuities and the subducting slab. Our results show the 410 uplifted by 30 km near the Tonga slab and the 660 depressed by 20 to 30 km as expected for thermally controlled olivine phase transitions.