an overview of izu-bonin-mariana...

An overview ofIzu-Bonin-Mariana subduction

Group members:罗珽 喻静 袁野 Sada Iddi

Outline

• Motivation• History of the IBM arc system• Morphology of the slab

Motivation

• An outstanding example of an intraoceanic convergent margin(IOCM);

• One of the earth's most dynamic, mysterious, and important geosystems.

Stern et al.2003

Overview of the IBM arc

Osamu Ishizuka et al.2006

Simplified history of the IBM arc system

Stern et al.2003

Map of the northwest Pacific

with ETOPO5 bathymetry

M.S.Miller et all.2006

P-wave tomographic model of the Earth’s mantle

Fukao et al. 2001

P-wave velocity perturbations

Huang & Zhao (2006)

Bulk-sound velocity and shear wave velocity anomalies along PP'

Vertical P-wave and transverse S-wave broadband seismograms at stations in southwestern Japan and China

for the Izu-Bonin deep shock

Sugioka et al. 2007

Bulk-sound velocity,S-wave and P-wave velocity anomalies

M.S.Miller et all.2005

Benioff zones below IBM arcs

van der Hilst et al.1993

Slab morphology in laboratory and numerical models

M.I.Billen 2008

Paleogeographic reconstruction of the western Pacific from the mid-Miocene

M.S.Miller et all.2006

Ogasawara Plateau

Caroline Island Ridge

Cartoon of the 3-D seismic structure below the Izu-Bonin and Mariana arcs and the

Philippine Sea plate

Hilst et al.1993

3-D morphology of the sub-ducting Pacific slab

beneath the IBM arc from P -wave

tomography images

M.S.Miller et all.2005

Picking the maximum gradient of velocity to define the top and bottom of the subducting slab

3D visualization model with focal mechanisms plotted

deeper events are characterizd by a shallower dip slip

M.S.Miller et all.2004

P-wave anomalies around Japan and Izu-Bonin slab at different layers

Obayashi M et al.2009

Obayashi M et al.2009

Obayashi M et al.2009

Obayashi M et al.2009

Stagnant slab influence on 660km

Obayashi et al. (2006)

Stagnant slab influence on 660km

Niu et al.2005

Thanks~

References• Fukao Y, Widiyantoro S, Obayashi M. 2001. Stagnant slabs in the upper and

lower mantle transition region. Rev. Geophys. 39:291–323• Huang J, Zhao D. 2006. High-resolution mantle tomography of China and

surrounding regions. J. Geophys.Res. 111:B09305• Obayashi M, Sugioka H, Yoshimitsu J, Fukao Y. 2006. High temperature

anomalies oceanward of subducting slabs at the 410-km discontinuity. Earth Planet. Sci. Lett. 243:149–58

• Miller M S, Gorbatov A, Kennett B L N. Heterogeneity within the subducting Pacific slab beneath the Izu–Bonin–Mariana arc: Evidence from tomography using 3D ray tracing inversion techniques[J]. Earth and Planetary Science Letters, 2005, 235(1): 331-342.

• Miller M S, Kennett B L N, Toy V G. Spatial and temporal evolution of the subducting Pacific plate structure along the western Pacific margin[J]. Journal of Geophysical Research: Solid Earth, 2006, 111(B2).

• Niu F, Levander A, Ham S, et al. Mapping the subducting Pacific slab beneath southwest Japan with Hi-net receiver functions[J]. Earth and Planetary Science Letters, 2005, 239(1): 9-17.

• Stern R J, Fouch M J, Klemperer S L. An overview of the Izu‐ Bonin‐ Mariana subduction factory[J]. Inside the subduction factory, 2003: 175-222.

• van der Hilst R, Seno T. Effects of relative plate motion on the deep structure and penetration depth of slabs below the Izu-Bonin and Mariana island arcs[J]. Earth and Planetary Science Letters, 1993, 120(3): 395-407.

• Ishizuka O, Kimura J I, Li Y B, et al. Early stages in the evolution of Izu–Bonin arc volcanism: New age, chemical, and isotopic constraints[J]. Earth and Planetary Science Letters, 2006, 250(1): 385-401.

• Miller M S, Kennett B L N, Lister G S. Imaging changes in morphology, geometry, and physical properties of the subducting Pacific plate along the Izu–Bonin–Mariana arc[J]. Earth and Planetary Science Letters, 2004, 224(3): 363-370.

• Obayashi M, Yoshimitsu J, Fukao Y. Tearing of stagnant slab[J]. Science, 2009, 324(5931): 1173-1175.

• Castle J C, Creager K C. A steeply dipping discontinuity in the lower mantle beneath Izu‐ Bonin[J]. Journal of Geophysical Research: Solid Earth, 1999, 104(B4): 7279-7292.