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Detailed seismic imaging of Merapi volcano, Indonesia, from local earthquake travel-time tomography
Ramdhan M.a,b, Widiyantoro S.a, Nugraha A.D.a, Metaxian J.-P., Rawlinson N., Saepuloh A.a, Kristyawan S.a,b, Sembiring A.S.a,b, Budi-Santoso A.f, Laurin A., Fahmi A.A.
a Study Program of Earth Science, Faculty of Earth Sciences and Technology, Institut Teknologi Bandung, Bandung, 40132, Indonesia
b Agency for Meteorology, Climatology and Geophysics, Jakarta, Indonesia
c ISTerre, IRD R219, CNRS, Université de Savoie Mont Blanc, Le Bourget-du-Lac, France
d Institut de Physique du Globe de Paris, Université Sorbonne-Paris-Cité, CNRS, France
e Department of Earth Sciences – Bullard Labs, University of Cambridge, Cambridge, CB30EZ, United Kingdom
f Center for Volcanology and Geological Hazard Mitigation, Geological Agency, Bandung, 40122, 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]© 2019 Elsevier LtdMt. Merapi, located in central Java, Indonesia, is one of the most active volcanoes in the world. It has been subjected to numerous studies using a variety of methods, including tomographic imaging, in an attempt to understand the structure and dynamics of its magmatic plumbing system. Results of previous seismic tomographic studies that include Mt. Merapi poorly constrain the location of its underlying magma source due to limited data coverage. In order to comprehensively understand the internal structure and magmatism of Mt. Merapi, a project called DOMERAPI was conducted, in which 53 broadband seismic stations were deployed around Mt. Merapi and its neighbourhood for approximately 18 months, from October 2013 to April 2015. In this study, we compare Vp, Vs, and Vp/Vs tomograms constructed using data obtained from local (DOMERAPI) and regional seismic networks with those obtained without DOMERAPI data. We demonstrate that the data from the DOMERAPI seismic network are crucial for resolving key features beneath the volcano, such as high Vp/Vs ratios beneath the Merapi summit at ∼5 km and ∼15 km depths, which we interpret as shallow and intermediate magma bodies, respectively. Furthermore, west-east vertical sections across Mt. Merapi, and a “dormant” (less active) volcano, Mt. Merbabu, exhibit high Vp/Vs and low Vp/Vs ratios, respectively, directly beneath their summits. This observation likely reflects the presence (for Mt. Merapi) and absence (for Mt. Merbabu) of shallow magma bodies near the surface.[/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]DOMERAPI,Merapi,Merbabu,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 grateful to the French National Research Agency and Institut de recherche pour le développemen for funding the DOMERAPI project. We would also like to express our gratitude to PVMBG as the main partner of the DOMERAPI project in Indonesia, and BMKG for providing us with the earthquake data catalog used in this study. Thanks go to GFZ for granting access to the MERAMEX data, and Lembaga Pengelola Dana Pendidikan (LPDP), the Republic of Indonesia, for granting a doctoral scholarship to MR. This study was also supported in part by Direktorat Perguruan Tinggi (DIKTI), the Republic of Indonesia, through a WCU research grant 2016/2017, and a 2018 research grant from Institut Teknologi Bandung (ITB) awarded to SW. We are grateful for the constructive and helpful comments from the two anonymous reviewers. All images in this paper were plotted using the GMT program ( Wessel and Smith, 1998 ).[/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.jseaes.2019.03.018[/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]