Upper mantle tomography in the northwestern Pacific region using triplicated P waves
Upper mantle tomography in the northwestern Pacific region using triplicated P waves
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DOI：
10.1002/2014jb011161
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发表时间：
2014-10
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影响因子：
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通讯作者：
N. Takeuchi;H. Kawakatsu;S. Tanaka;M. Obayashi;Y. Chen;J. Ning;S. Grand;F. Niu;J. Ni;R. Iritani;K. Idehara;T. Tonegawa
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作者：
N. Takeuchi;H. Kawakatsu;S. Tanaka;M. Obayashi;Y. Chen;J. Ning;S. Grand;F. Niu;J. Ni;R. Iritani;K. Idehara;T. Tonegawa
利用中国东北扩展地震阵列、F - net和附近可用台站的P数据，对西北太平洋下地幔进行了延迟时间层析成像。为了提高地幔不连续区域附近的分辨率和精度，我们利用波形拟合技术提取了三倍距离观测到的初始相和次级相的旅行时间。与仅使用初始相位获得的模型相比，在410 km不连续面以上的分辨率得到了特别的提高，并且在410 km不连续面以下的长白火山下可以清晰地观测到低速异常。与以前的模型相比，410顶部的低速异常更加明显。本研究结果与之前的接收函数分析进一步支持了我们在长白火山下有热物质的观点。
We conducted delay time tomography of the upper mantle beneath the northwestern Pacific using P data from NorthEast China Extended SeiSmic Array, F‐net, and nearby available stations. To improve resolution and accuracy in the vicinity of mantle discontinuities, we extracted traveltimes of both initial and secondary phases observed at triplication distances by using a waveform fitting technique. Compared with the model obtained by using only the initial phase, the resolution just above the 410 km discontinuity is especially improved, and low‐velocity anomalies beneath the Changbai Volcano are clearly observed down to the 410 km discontinuity. Compared with previous models, low‐velocity anomalies atop the 410 are more pronounced. The results of this study together with the previous receiver function analysis provide further support that we have hot material beneath the Changbai Volcano.