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Interplate coupling model off the southwestern coast of Java, Indonesia, based on continuous GPS data in 2008-2010
Hanifa N.R.a, Sagiya T.a, Kimata F.b, Efendi J.c, Abidin H.Z.d, Meilano I.d
a Disaster Mitigation Research Center, Nagoya University, Japan
b Tono Research Institute of Earthquake Science, Japan
c Geospatial Information Agency, Indonesia
d Geodesy Research Group, Institute of Technology Bandung, Indonesia
[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]We present an interplate coupling model of the Australia-Java plate interface off the southwestern coast of Java, Indonesia, based on data from the Indonesian Permanent GPS Station Network from 2008 to 2010. The majority of vertical data indicate uplift, while the baseline change rate indicates coastal contraction in the middle of the network and coastal extension in the eastern part of the network. Using the rate of baseline length changes and the absolute rate of vertical displacements, we apply a geodetic inversion method by Yabuki and Matsu’ura (1992). From the inversion result, we interpret the main source of the observed velocity in West Java as resulting from contributions of (1) interplate coupling off Ujung Kulon-Pelabuhan Ratu at 20 to 40 km depth, with a slip rate range from 48 to 56 mm/yr, (2) interplate coupling off Pangandaran at 37 to 45 km depth with a slip rate of 48 to 55 mm/yr, (3) afterslip off Pangandaran within the rupture area of the 2006 M7.8 Java earthquake, in the depth range of 15-20 km, with a slip excess rate of 57-61 mm/yr. The absence of a megathrust earthquake for at least 300 years in this region implies seismic moment accumulation during this time period of 1.6 × 1021Nm (~Mw8.7) off Ujung Kulon-Pelabuhan Ratu, and 3.9 × 1021Nm (~Mw8.3) off Pangandaran, unless episodic slow slips release tectonic stress. © 2014 Elsevier B.V.[/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]Afterslip,Episodic slow slips,GPS measurements,GPS station networks,Interplate coupling,Megathrust earthquakes,Slip deficit,Vertical displacements[/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]Afterslip,GPS measurement,Interplate coupling,Java trench,Slip deficit,Tsunami earthquake[/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 grateful to the editor Prof. Peter Shearer, three anonymous reviewers, Prof. Yuichiro Tanioka, Prof. Eric Calais, Prof. Kelin Wang, and Dr. Takeo Ito for constructive discussion and suggestions for improvement of the model and the manuscript. We thank Dr. Cecep Subarya and Yan Anugerah for GPS data assistance, and Fanani Hendy for kindly sharing subfunctions as part of a program calculation. All figures are generated by The Generic Mapping Tools ( Wessel et al., 2013 ). This study is partially funded by Monbukagakusho Scholarship from the Ministry of Education, Culture, Sports, Science, and Technology of Japan.[/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/j.epsl.2014.06.010[/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]