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Direct Inversion of S-P Differential Arrival Times for VpVs Ratio in SE Asia
Zenonos A.a, DeSiena L.b, Widiyantoro S.c,d, Rawlinson N.e
a School of Geosciences, University of Aberdeen, Aberdeen, United Kingdom
b Institute of Geosciences, Johannes Gutenberg University, Mainz, Germany
c Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Bandung, Indonesia
d Faculty of Engineering, Maranatha Christian University Bandung, Bandung, Indonesia
e Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom
[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]©2020.The Authors.Southeast Asia lies within one of the most complex tectonic settings on Earth and exhibits a range of features, including strongly curved subduction zones, arc-continent collision, and slab break-off, which are not well understood. To help gain insight into mantle structure and processes beneath this region, we perform an inversion for variations in Vp, Vs, and (Formula presented.) structure using arrival time information from the ISC-EHB catalog. The oceanic lithosphere subducting beneath Java is imaged as a positive dVp and negative d(Vp/Vs) anomaly. At 200 km depth, the forearc mantle beneath Sumatra and Java is revealed by positive dVp and d(Vp/Vs) anomalies which cease at Sumba island, where negative d(Vp/Vs) anomalies mark the presence of cold Australian lithosphere (down to 200–250 km depth) which is colliding with Sundaland. These negative d(Vp/Vs) anomalies depict a ∼WE trending structure that appears to correspond with the underthrusting of Australian continental crust. One notable salient has a location and shape which appears to coincide with those of ancient terranes or a Gondwana-related microcontinent reconstructed by paleogeographic studies and may have been entrained in the subduction process. The velocity and d(Vp/Vs) patterns beneath the Banda Arc support the existence of a single curved subducting slab associated with rollback. The extreme extensional strike-slip setting in Seram produces the highest positive d(Vp/Vs) anomalies in the model which may be due to one or more of widespread serpentinization, high concentrations of intraslab fluid-filled faulting, and mantle upwelling.[/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]joint inversion,SE Asia,tomography,traveltime,Vp/Vs[/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][{‘$’: ‘We thank the two anonymous reviewers for their constructive comments, which significantly improved the original version of this manuscript. We also thank the University of Aberdeen and the Australian National University (ANU) for providing funding for this research. Many of the figures contained in this manuscript were produced using the Generic Mapping Tools (Wessel et al.,). Moreover, we thank the ISC for making the ISC-EHB data set freely available (on www.isc.ac.uk). The tomographic models, which were produced as part of this study, can be found online (at https://doi.org/10.17632/vpyjcb268w.1). The tomographic inversion was performed using the software package FMTOMO, which can be downloaded online (from https://rses.anu.edu.au/~nick/fmtomo.html). An informal review from Robert Hall greatly helped us to frame the interpretation of the velocity and VpVs patterns beneath the Banda Sea.’}, {‘$’: ‘We thank the two anonymous reviewers for their constructive comments, which significantly improved the original version of this manuscript. We also thank the University of Aberdeen and the Australian National University (ANU) for providing funding for this research. Many of the figures contained in this manuscript were produced using the Generic Mapping Tools (Wessel et al., ). Moreover, we thank the ISC for making the ISC‐EHB data set freely available (on www.isc.ac.uk ). The tomographic models, which were produced as part of this study, can be found online (at https://doi.org/10.17632/vpyjcb268w.1 ). The tomographic inversion was performed using the software package FMTOMO, which can be downloaded online (from https://rses.anu.edu.au/~nick/fmtomo.html ). An informal review from Robert Hall greatly helped us to frame the interpretation of the velocity and patterns beneath the Banda Sea.’}][/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/10.1029/2019JB019152[/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]