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  4. 中国科学院地球与行星物理重点实验室
Body Waves Retrieved From Noise Cross-Correlation Reveal Lower Mantle Scatterers Beneath the Northwest Pacific Subduction Zone

文献类型：期刊论文

作者Zhang, Limeng2,3,4; Li, Juan2,3,4; Wang, Tao1; Yang, Fan2,3,4; Chen, Qi-Fu2,3,4
刊名GEOPHYSICAL RESEARCH LETTERS
出版日期2020-10-16
卷号47期号:19页码:10
关键词ambient noise body wave lower mantel heterogeneity scatterer subduction zone
ISSN号0094-8276
DOI10.1029/2020GL088846
英文摘要Seismological studies have revealed heterogeneities at scales of 10-1,000 km in the lower mantle. For the first time, we demonstrate here that seismic interferometry of ambient noise can be used to detect faint scattered waves. We locate scattering structures at depths of similar to 900-1,000 km from P-to-P scattered wave signals in stacks of vertical cross-correlograms from dense seismic arrays in northeast China. Independently, we show that this scattering structure produces S-to-P converted signals in the recordings of a deep earthquake. We constrain the thickness (H), the contrasts of the shear wave speed (delta Vs), and density (delta rho) of the anomaly using 1-D synthetics. Our modeling of both the reflected and converted signals indicates that H = 10-20 km, delta Vs = -7.2%, and delta rho = 0.6%, which are similar to values reported previously and consistent with the interpretation that the scattering structure is a fragment of the basaltic oceanic crust associated with the subducted Izanagi plate. Plain Language Summary Analysis of surface waves in ambient noise has been widely applied to image the structure of the crust and mantle. However, it is more difficult to extract the signals of body waves in the deep mantle from ambient noise. We explore signals by cross-correlation using ground motion recordings from dense seismic arrays in northeast China. We identify a scattering signal at time similar to 200 s. By analyzing and comparing the results of conversion waves generated by deep earthquakes, we confirm that this scattering signal represents a kind of body wave reflected by a small-scale structure in the mid-mantle at depths of similar to 900-1,000 km. The successful extraction of the weak body waves generated by scatterers in the lower mantle provides a potential method for the global detection of fine-scale heterogeneities in the mantle, which will provide a better understanding of the composition and structure of the mantle, and the geodynamic processes in the deep earth.
WOS关键词CRUSTAL STRUCTURE BENEATH ; SEISMIC SCATTERERS ; NE CHINA ; DISCONTINUITY ; SLAB ; TOMOGRAPHY ; RAYLEIGH ; 410KM ; TIMES
资助项目Strategic Priority Research Program (B) of Chinese Academy of Sciences[XDB18010302] ; National Key R&D Program of China on Monitoring, Early Warning and Prevention of Major Natural Disaster[2017YFC1500300] ; NSFC[41774065] ; NSFC[41774046] ; NSFC[91958209]
WOS研究方向Geology
语种英语
WOS记录号WOS:000584669000048
出版者AMER GEOPHYSICAL UNION
资助机构Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; National Key R&D Program of China on Monitoring, Early Warning and Prevention of Major Natural Disaster ; National Key R&D Program of China on Monitoring, Early Warning and Prevention of Major Natural Disaster ; National Key R&D Program of China on Monitoring, Early Warning and Prevention of Major Natural Disaster ; National Key R&D Program of China on Monitoring, Early Warning and Prevention of Major Natural Disaster ; NSFC ; NSFC ; NSFC ; NSFC ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; National Key R&D Program of China on Monitoring, Early Warning and Prevention of Major Natural Disaster ; National Key R&D Program of China on Monitoring, Early Warning and Prevention of Major Natural Disaster ; National Key R&D Program of China on Monitoring, Early Warning and Prevention of Major Natural Disaster ; National Key R&D Program of China on Monitoring, Early Warning and Prevention of Major Natural Disaster ; NSFC ; NSFC ; NSFC ; NSFC ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; National Key R&D Program of China on Monitoring, Early Warning and Prevention of Major Natural Disaster ; National Key R&D Program of China on Monitoring, Early Warning and Prevention of Major Natural Disaster ; National Key R&D Program of China on Monitoring, Early Warning and Prevention of Major Natural Disaster ; National Key R&D Program of China on Monitoring, Early Warning and Prevention of Major Natural Disaster ; NSFC ; NSFC ; NSFC ; NSFC ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; Strategic Priority Research Program (B) of Chinese Academy of Sciences ; National Key R&D Program of China on Monitoring, Early Warning and Prevention of Major Natural Disaster ; National Key R&D Program of China on Monitoring, Early Warning and Prevention of Major Natural Disaster ; National Key R&D Program of China on Monitoring, Early Warning and Prevention of Major Natural Disaster ; National Key R&D Program of China on Monitoring, Early Warning and Prevention of Major Natural Disaster ; NSFC ; NSFC ; NSFC ; NSFC
源URL[http://ir.iggcas.ac.cn/handle/132A11/98696]  
专题地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者Li, Juan
作者单位1.Nanjing Univ, Sch Earth Sci & Engn, Nanjing, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
3.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Zhang, Limeng,Li, Juan,Wang, Tao,et al. Body Waves Retrieved From Noise Cross-Correlation Reveal Lower Mantle Scatterers Beneath the Northwest Pacific Subduction Zone[J]. GEOPHYSICAL RESEARCH LETTERS,2020,47(19):10.
APA Zhang, Limeng,Li, Juan,Wang, Tao,Yang, Fan,&Chen, Qi-Fu.(2020).Body Waves Retrieved From Noise Cross-Correlation Reveal Lower Mantle Scatterers Beneath the Northwest Pacific Subduction Zone.GEOPHYSICAL RESEARCH LETTERS,47(19),10.
MLA Zhang, Limeng,et al."Body Waves Retrieved From Noise Cross-Correlation Reveal Lower Mantle Scatterers Beneath the Northwest Pacific Subduction Zone".GEOPHYSICAL RESEARCH LETTERS 47.19(2020):10.

入库方式： OAI收割

来源：地质与地球物理研究所

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