气候变化领域集成服务门户(CCPortal): Seismic Structure of the Antarctic Upper Mantle Imaged with Adjoint Tomography

CCPortal

DOI	10.1029/2019JB017823
	Seismic Structure of the Antarctic Upper Mantle Imaged with Adjoint Tomography
	Lloyd A.J.; Wiens D.A.; Zhu H.; Tromp J.; Nyblade A.A.; Aster R.C.; Hansen S.E.; Dalziel I.W.D.; Wilson T.J.; Ivins E.R.; O’Donnell J.P.
发表日期	2020
ISSN	21699313
卷号	125 期号:3
英文摘要	The upper mantle and transition zone beneath Antarctica and the surrounding oceans are among the poorest-imaged regions of the Earth's interior. Over the last 15 years, several large broadband regional seismic arrays have been deployed, as have new permanent seismic stations. Using data from 297 Antarctic and 26 additional seismic stations south of ~40°S, we image the seismic structure of the upper mantle and transition zone using adjoint tomography. Over the course of 20 iterations, we utilize phase observations from three-component seismograms containing P, S, Rayleigh, and Love waves, including reflections and overtones, generated by 270 earthquakes that occurred from 2001–2003 and 2007–2016. The new continental-scale seismic model (ANT-20) possesses regional-scale resolution south of 60°S. In East Antarctica, thinner continental lithosphere is found beneath areas of Dronning Maud Land and Enderby-Kemp Land. A continuous slow wave speed anomaly extends from the Balleny Islands through the western Ross Embayment and delineates areas of Cenozoic extension and volcanism that span both oceanic and continental regions. Slow wave speed anomalies are also imaged beneath Marie Byrd Land and along the Amundsen Sea Coast, extending to the Antarctic Peninsula. These anomalies are confined to the upper 200–250 km of the mantle, except in the vicinity of Marie Byrd Land where they extend into the transition zone and possibly deeper. Finally, slow wave speeds along the Amundsen Sea Coast link to deeper anomalies offshore, suggesting a possible connection with deeper mantle processes. ©2019. American Geophysical Union. All Rights Reserved.
语种	英语
来源期刊	Journal of Geophysical Research: Solid Earth
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/187934
作者单位	Department of Earth and Planetary Sciences, Washington University, St. Louis, MO, United States; Department of Geosciences, The University of Texas at Dallas, Richardson, TX, United States; Department of Geosciences and Program in Applied and Computational Mathematics, Princeton University, Princeton, NJ, United States; Department of Geosciences, Pennsylvania State UniversityPA, United States; Department of Geosciences, Colorado State University, Fort Collins, CO, United States; Department of Geological Sciences, The University of Alabama, Tuscaloosa, AL, United States; Institute for Geophysics, Jackson School of Geosciences, The University of Texas at Austin, Austin, TX, United States; Byrd Polar Research Center and School of Earth Sciences, The Ohio State University, Columbus, OH, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States; School of Earth and Environment, The University of Leeds, Leeds, United Kingdom
推荐引用方式 GB/T 7714	Lloyd A.J.,Wiens D.A.,Zhu H.,et al. Seismic Structure of the Antarctic Upper Mantle Imaged with Adjoint Tomography[J],2020,125(3).
APA	Lloyd A.J..,Wiens D.A..,Zhu H..,Tromp J..,Nyblade A.A..,...&O’Donnell J.P..(2020).Seismic Structure of the Antarctic Upper Mantle Imaged with Adjoint Tomography.Journal of Geophysical Research: Solid Earth,125(3).
MLA	Lloyd A.J.,et al."Seismic Structure of the Antarctic Upper Mantle Imaged with Adjoint Tomography".Journal of Geophysical Research: Solid Earth 125.3(2020).