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Seismic tomography with P and S data reveals lateral variations in the rigidity of deep slabs
Widiyantoro S.a, Kennett B.L.N.b, Van Der Hilst R.D.c
a Dept. of Geophysics and Meteorology, Bandung Inst. of Technology, 40132, Indonesia
b Research School of Earth Sciences, The Australian National University, Australia
c Department of Earth, Atmosph., Planet. Sci., M., United States
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]Regional seismic tomography of the northwest Pacific island arcs using P- and S-wave arrival time data with similar path coverage reveals an oceanic lithospheric slab deflected in the mantle transition zone beneath the Izu Bonin region in good agreement with the results of earlier tomographic and other seismic studies in the region. The S-wave images, however, do not show clearly the deflection of the slab. This implies that the stagnant lithospheric slab in the transition zone is more likely a bulk-sound structure, which is strongly supported by our results from joint inversions for bulk-sound and shear wavespeeds. For the Izu Bonin region, where trench migration has been reported, the properties of the deflected slab lying on top of the 660 km discontinuity show strong bulk-sound and weak shear signatures in contrast to the descending slab itself. There is an indication in the shear images that a component of the former oceanic lithosphere is penetrating into the top of the lower mantle, suggesting that a slab split has occurred.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text]P-waves,Rigidity,S-waves,Slabs,Tomography[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text]We are very grateful to E.R. Engdahl for extensively refining the arrival-time information used in this study and Y. Fukao, S.P. Grand and T. Seno for carefully reading earlier versions of the manuscript and helpful comments. S.W. would like to thank JSPS for a Postdoctoral Fellowship (1998/1999) to conduct research at the Earthquake Research Institute, University of Tokyo where part of this work was done. [ RV ][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.1016/S0012-821X(99)00216-2[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]