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Fate of Forearc Lithosphere at Arc-Continent Collision Zones: Evidence From Local Earthquake Tomography of the Sunda-Banda Arc Transition, Indonesia
Supendi P.a,b, Nugraha A.D.a, Widiyantoro S.a, Abdullah C.I.a, Rawlinson N., Cummins P.R.d, Harris C.W., Roosmawati N.d, Miller M.S.d
a Geophysical Engineering Study Program, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Bandung, Indonesia
b Agency for Meteorology Climatology and Geophysics (BMKG), Bandung, Indonesia
c Department of Earth Sciences, Bullard Laboratories, University of Cambridge, Cambridge, United Kingdom
d Research School of Earth Sciences, Australian National University, Canberra, Australia
e Institut de Physique du Globe de Strasbourg, Universite de Strasbourg, EOST/CNRS, Strasbourg, France
[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.A new 3-D seismic P wave velocity model of the Sunda-Banda Arc Transition from local earthquake tomography reveals (i) northward subduction of oceanic lithosphere, associated with the convergence of Australia and Sundaland, as a high-velocity zone extending down to ~200 km depth; (ii) two distinct low-velocity zones, one immediately above the slab, which is likely a zone of partial melt, and one in the 0–40 km depth range, which is probably a magma chamber associated with active volcanoes above; and (iii) a northerly dipping high-velocity zone that bisects the two low-velocity anomalies, which we interpret as an underthrust forearc sliver of continental origin. Based on He3/He4 measurements from volcanic outflows, it is possible that the magma supply is contaminated by interaction with this forearc sliver as it ascends from the melt region below.[/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]Arc-continent collision,collision,Continental origin,Indonesia,Low velocity zones,Low-velocity anomaly,Oceanic lithosphere,subduction[/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]collision,earthquakes,Indonesia,subduction,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][{‘$’: “The YS network deployment was funded by the National Science Foundation grant EAR-1250214. All time series data are stored at the IRIS Data Management Center (http://ds.iris.edu/mda/YS), and for additional details see web site (http://www.fdsn.org/networks/detail/YS_2014/). We also thank the Instituto do Petr?leo e Geologia (IPG) of Timor-Leste, without whose support this work would not have been possible. Nor would it be possible without the fieldwork of Leland O’Driscoll, Eug?nio Soares, Lu?s Te?filo da Costa, and Robert Porritt. All figures were made using the Generic Mapping Tools (Wessel & Smith,?1998). Topography and bathymetry data were taken from Shuttle Radar Topography Mission (SRTM) 30 Plus (Becker et al.,?2009). This work was supported by the Indonesian Ministry of Research, Technology and Higher Education under Doctoral Program 2019 managed by Institut Teknologi Bandung awarded to A. D. N. The data which supports the conclusions can be obtained from Figshare (10.6084/m9.figshare.11108789 and 10.6084/m9.figshare.11108759). We thank Robert Hall and Ron Harris for constructive reviews of the original version of this manuscript.”}, {‘$’: “The YS network deployment was funded by the National Science Foundation grant EAR‐1250214. All time series data are stored at the IRIS Data Management Center ( http://ds.iris.edu/mda/YS ), and for additional details see web site ( http://www.fdsn.org/networks/detail/YS_2014/ ). We also thank the (IPG) of Timor‐Leste, without whose support this work would not have been possible. Nor would it be possible without the fieldwork of Leland O’Driscoll, Eugénio Soares, Luís Teófilo da Costa, and Robert Porritt. All figures were made using the Generic Mapping Tools (Wessel & Smith, 1998 ). Topography and bathymetry data were taken from Shuttle Radar Topography Mission (SRTM) 30 Plus (Becker et al., 2009 ). This work was supported by the Indonesian Ministry of Research, Technology and Higher Education under Doctoral Program 2019 managed by Institut Teknologi Bandung awarded to A. D. N. The data which supports the conclusions can be obtained from Figshare ( 10.6084/m9.figshare.11108789 and 10.6084/m9.figshare.11108759 ). We thank Robert Hall and Ron Harris for constructive reviews of the original version of this manuscript. Instituto do Petróleo e Geologia”}][/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/10.1029/2019GL086472[/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]