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Sharpening the tomographic image of the subducting slab below Sumatra, the Andaman Islands and Burma
Pesicek J.D.a, Thurber C.H.a, Widiyantoro S.b, Zhang H.c, DeShon H.R.d, Engdahl E.R.e
a Department of Geoscience, University of Wisconsin-Madison, United States
b Faculty of Mining and Petroleum Engineering, Bandung Institute of Technology, Indonesia
c Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, United States
d Center for Earthquake Research and Information, University of Memphis, United States
e Department of Physics, University of Colorado, 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]Taking advantage of the increased ray coverage due to seismicity following the 2004 December and 2005 March great earthquakes, an improved iterative regional-global tomographic method was applied to the Sumatra-Andaman and adjacent regions to better constrain the 3-D mantle velocity heterogeneity in the region. Velocity and hypocentral parameters were iteratively perturbed to sharpen the image of the subducted slab. Several iterations were performed, and the effects of source mislocation were considered in the iterative process, an issue usually neglected in global tomography. We find that source relocation between iterations increases the amplitudes of slab anomalies and sharpens the definition of slab geometry beyond what can be achieved by a fixed-source iterative inversion alone. In addition, extensive restoration tests of synthetic data were conducted that emphasize enhancements obtained by our iterative process. These tests show significant increases in amplitude and decreased smearing of synthetic slab features. Thus, when applied to the real data, similar enhancements are inferred in the resulting model, which better illustrates the complex slab geometry in the upper-mantle and transition zone regions along the Sumatra, Andaman and Burma subduction zones. © 2010 The Authors Journal compilation © 2010 RAS.[/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]Asia,Seismic tomography,Seismicity and tectonics,Subduction zone processes[/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][/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/10.1111/j.1365-246X.2010.04630.x[/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]