Subducted slabs stagnant above, penetrating through, and trapped below the 660 km discontinuity

Journal of Geophysical Research: Solid Earth - Tập 118 Số 11 - Trang 5920-5938 - 2013
Yoshio Fukao1, Masayuki Obayashi2
1Institute for Research on Earth Evolution Japan Agency for Marine-Earth Science and Technology Yokohama Kanagawa Japan
2Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Kanagawa, Japan

Tóm tắt

AbstractA newPwave tomographic model of the mantle was constructed using more than 10 million travel times. The finite‐frequency effect of seismic rays was taken into account by calculating banana‐donut kernels at 2 Hz for all first arrival time data, and at 0.1 Hz for broadband differential travel time data. Based on this model, a systematic survey for subducted slab images was developed for the circum‐Pacific; including the Kurile, Honshu, Izu‐Bonin, Mariana, Java, Tonga‐Kermadec, southern and northern South America, and Central America, arcs. This survey revealed a progressive lateral variation of the configuration of slabs along arc(s), which we interpret as an indication for successive stages of slab subduction through the Bullen's transition region with the 660 km discontinuity at the middle. We identified the four distinct stages: I ‐ slab stagnant above the 660 km discontinuity; II ‐ slab penetrating the 660 km discontinuity; III ‐ slab trapped in the uppermost lower mantle (at a depth of 660–1000 km); and IV ‐ slab descending well into the deep lower mantle. The majority of slab images are found to be either at Stage I or III, suggesting that Stages I and III are relatively stable or neutral and II and IV are relatively unstable or transient. There is a remarkable distinction for the deepest hypocentral distribution between slabs at Stage I and slabs at Stages II or III.

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Tài liệu tham khảo

10.1029/2010GC003301

10.1029/2007JB005111

Bijwaard H., 1998, Closing the gap between regional and global tomography, J. Geophys. Res., 103, 30,005, 10.1029/98JB02467

10.1146/annurev.earth.36.031207.124129

10.1029/96GL03483

10.1016/j.tecto.2008.10.011

10.1029/2004JB003470

Bullen B., 1963, Introduction to the Theory of Seismology

10.1016/j.pepi.2010.02.006

10.1016/0012-821X(96)00023-4

10.1029/2007JB005261

10.1029/2007GL031006

10.1046/j.1365-246X.2000.00070.x

Das S., 2000, Mechanism of slab thickening near 670 km under Indonesia, J. Geophys. Res., 27, 831

10.1029/95GL02013

10.1785/BSSA0880030722

10.1029/2003JB002562

10.1038/35074000

10.1029/91JB02749

10.1029/1999RG000068

10.1146/annurev.earth.36.031207.124224

10.1016/j.epsl.2008.04.006

10.1111/j.1365-246X.2005.02507.x

10.1098/rsta.2002.1077

Grand S. P., 1997, Global seismic tomography: A snapshot of convection in the Earth, GSA Today, 7, 1

10.1016/S0040-1951(00)00265-1

Hall R., 2002, Subducted slabs beneath the eastern Indonesia‐Tonga region: Insights from tomography, Phys. Earth Planet. Inter., 201, 321

10.1029/2005JB004066

10.1029/JB093iB02p01073

10.1038/351140a0

10.1016/S0012-821X(03)00048-7

10.1016/j.epsl.2009.06.044

10.1038/371301a0

10.1016/j.pepi.2003.07.033

10.1016/B978-044452748-6/00020-1

10.1016/S0031-9201(01)00270-9

10.1038/nature01281

10.1029/2009JB006882

10.1029/2007GC001806

10.1016/j.epsl.2010.09.010

10.1093/gji/ggs017

10.1016/j.epsl.2004.05.018

10.1016/j.epsl.2004.06.005

Miyamachi H., 2009, Construction of the broadband seismic network in Far Eastern Russia for imaging the stagnant slab, Geophys. Bull. Hokkaido Univ., 72, 37

10.1016/j.pepi.2010.04.001

10.1029/94GL03332

10.1029/2002JB002384

10.1111/j.1365-246X.2004.02233.x

10.1126/science.1172496

10.1002/2013GL057401

10.1029/2003JB002821

10.1029/2005JB004154

10.1016/S0012-821X(04)00070-6

10.1016/j.epsl.2006.11.028

10.1029/2007GC001657

10.1130/G31937.1

10.1016/j.earscirev.2008.01.005

10.1029/1999JB900091

10.1029/2009EO090002

10.1029/2010GC003421

10.1038/nature12019

10.1038/ngeo231

10.1029/2012JB009525

10.1016/j.tecto.2009.08.041

10.1016/S0031-9201(99)00172-7

10.1029/2007JB005080

10.1016/j.tecto.2007.08.003

10.1038/374154a0

Hilst R., 1993, Effects of relative plate motion on the deep structure and penetration depth of slabs below the Izu‐Bonin and Mariana island arcs, Earth Planet. Sci. Lett., 120, 375

10.1038/353037a0

10.1038/386578a0

10.1038/NGEO708

10.1016/0012-821X(95)00064-J

10.1016/S0012-821X(96)00238-5

10.1126/science.271.5255.1566

10.1144/SP355.7

10.1016/j.pepi.2008.11.002

10.1016/j.pepi.2010.02.005

10.1016/j.pepi.2003.07.032

10.1016/j.pepi.2008.11.009

10.1016/j.rgg.2010.08.003

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Thông tin xuất bản

Journal of Geophysical Research: Solid Earth

Tập 118 Số 11

5920-5938

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