https://scholars.lib.ntu.edu.tw/handle/123456789/411212
標題: | Lower Mantle Substructure Embedded in the Farallon Plate: The Hess Conjugate | 作者: | YEN-TING KO Helmberger, Don V. Wang, Huilin Zhan, Zhongwen |
關鍵字: | Farallon Plate | Hess conjugate | multipathing | waveform modeling | 公開日期: | 28-十月-2017 | 出版社: | AMER GEOPHYSICAL UNION | 卷: | 44 | 期: | 20 | 起(迄)頁: | 10216 | 來源出版物: | Geophysical Research Letters | 摘要: | ©2017. American Geophysical Union. All Rights Reserved. The morphologies of subducted remnants in the lower mantle are essential to our understanding of the history of plate tectonism. Here we image a high-velocity slab-like (HVSL) anomaly beneath the southeastern U.S. using waveforms from five deep earthquakes beneath South America recorded by the USArray. In addition to travel time anomalies, the multipathing of S and ScS phases at different distances are used to constrain the HVSL model. We jointly invert S and ScS traveltimes, amplitudes, and waveform complexities to produce a best fitting block model characterized by a rectangular shape with a 2.5% S wave velocity increase and tapered edges. While the Farallon slab is expected to dip primarily eastward, the HVSL structure apparently dips 40° to 50° to the SE and appears to be related to the eclogitized Hess conjugate. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/411212 | ISSN: | 00948276 | DOI: | 10.1002/2017GL075032 |
顯示於: | 海洋研究所 |
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