Detailed seismic imaging of Merapi volcano, Indonesia, from local earthquake travel-time tomography

Ramdhan, Mohamad and Widiyantoro, Sri and Nugraha, Andri D. and Métaxian, Jean-Philippe and Rawlinson, Nicholas and Saepuloh, Asep and Kristyawan, Said and Sembiring, Andry S. and Budi-Santoso, Agus and Laurin, Antoine and Fahmi, Ahmad A. (2019) Detailed seismic imaging of Merapi volcano, Indonesia, from local earthquake travel-time tomography. Journal of Asian Earth Sciences, 177. pp. 134-145. ISSN 1367-9120 DOI

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Mt. 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.

Item Type: Article
Uncontrolled Keywords: 2018AREP; IA74
Subjects: 02 - Geodynamics, Geophysics and Tectonics
Divisions: 02 - Geodynamics, Geophysics and Tectonics
Journal or Publication Title: Journal of Asian Earth Sciences
Volume: 177
Page Range: pp. 134-145
Identification Number:
Depositing User: Sarah Humbert
Date Deposited: 11 Apr 2019 20:46
Last Modified: 11 Apr 2019 20:46

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