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Subduction thermal structure, metamorphism and seismicity beneath north central Chile
Ji, YF (Ji, Yingfeng)1,2; Yoshioka, S (Yoshioka, Shoichi)1,3; Manea, VC (Constantin Manea, Vlad)4,5; Manea, M (Manea, Marina)4,5; Suenaga, N (Suenaga, Nobuaki)1
Source PublicationJOURNAL OF GEODYNAMICS
2019
Volume129Issue:0Pages:299-312
DOI10.1016/j.jog.2018.09.004
Abstract

Massive M > 8 earthquakes have repeatedly struck the coastal Chilean subduction megathrust at intervals of nearly ten years, and such tsunamigenic earthquakes have caused recurrent damage. A widely accepted mature seismic gap along the strongly coupled plate interface in northern Chile was filled unexpectedly by the occurrence of the 2014 M-w 8.2 Iquique earthquake, which occurred 130 years after the previous quake. This event revealed that our understanding of the state of seismogenesis along the Chilean margin is still poor. This study aims at investigating the temperature and water content distributions within the Nazca slab along a large portion of the Chilean margin. We employ 3-D time-dependent thermomechanical numerical models that incorporate up-to-date slab geometry and phase diagrams of hydrous minerals in the subducting plate to study the north central Chilean (19 degrees S-33 degrees S) coupled megathrust, including the region where the slab is subhorizontal (28 degrees S-32 degrees S). Our modeling results show that most shallow off- and onshore interplate earthquakes in north central Chile in the last decade have been mainly controlled by the phase transformation from lawsonite blueschist to amphibolite at shallow depths. On the other hand, some of the deep subduction seismicity is in good agreement with eclogitization within the oceanic crust and formation of harzburgite in the ultramafic rock in the lower slab. The M > 6 interplate earthquakes are estimated to occur where our models predict slab temperatures less than 400-600 degrees C and slab dehydration less than 0.03-0.05 wt%/km. Slow slip events tend to occur in regions where interplate temperatures are 400-600 degrees C (0.03-0.05 wt%/km). The activity level of regional interplate earthquakes and slow slip events is interpreted to be affected by the fluid release from and the temperature distribution in the Nazca slab.

Subject AreaGeosciences
WOS IDWOS:000477689800020
Language英语
Indexed BySCI
KeywordFlat-slab Subduction 7.7 Tocopilla Earthquake Crustal Deformation Nazca Plate Heat-flow Zone Slip Dehydration Rupture Locking
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
Cooperation Status国际
ISSN0264-3707
Department大陆碰撞与高原隆升重点实验室
URL查看原文
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.itpcas.ac.cn/handle/131C11/9182
Collection图书馆
Corresponding AuthorJi, YF (Ji, Yingfeng)
Affiliation1.Kobe Univ, Res Ctr Urban Safety & Secur, Rokkodai Cho 1-1,Nada Ward, Kobe, Hyogo 6578501, Japan;
2.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China;
3.Kobe Univ, Grad Sch Sci, Dept Planetol, Rokkodai Cho 1-1,Nada Ward, Kobe, Hyogo 6578501, Japan;
4.Univ Nacl Autonoma Mexico, Ctr Geociencias, Computat Geodynam Lab, Campus Juriquilla, Queretaro 76230, Qro, Mexico;
5.Romanian Acad, Astron Inst, Bucharest 040557, Romania.
Recommended Citation
GB/T 7714
Ji, YF ,Yoshioka, S ,Manea, VC ,et al. Subduction thermal structure, metamorphism and seismicity beneath north central Chile[J]. JOURNAL OF GEODYNAMICS,2019,129(0):299-312.
APA Ji, YF ,Yoshioka, S ,Manea, VC ,Manea, M ,&Suenaga, N .(2019).Subduction thermal structure, metamorphism and seismicity beneath north central Chile.JOURNAL OF GEODYNAMICS,129(0),299-312.
MLA Ji, YF ,et al."Subduction thermal structure, metamorphism and seismicity beneath north central Chile".JOURNAL OF GEODYNAMICS 129.0(2019):299-312.
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