Tomographic imaging of Central Java, Indonesia: Preliminary result of joint inversion of the MERAMEX and MCGA earthquake data

Rohadi, Supriyanto; Widiyantoro, Sri; Nugraha, Andri Dian; Masturyono,

doi:10.1063/1.4820328

Cited by 4 publications

(9 citation statements)

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“…Compared with a number of previous studies which used travel-time tomography (e.g. Wagner et al 2007;Koulakov et al 2007;Rohadi et al 2013;Haberland et al 2014), the inclusion of the DOMERAPI data illuminates the magma system below the Merapi volcano in much more detail. From the checkerboard test results, it is clearly seen that the seismic resolution beneath Merapi and its surroundings is greatly enhanced, especially in the crust (< 25 km); see Figs.…”

Section: Improved Resolution Due To the Inclusion Of Domerapi Datamentioning

confidence: 98%

“…For instance, P-and S-wave velocity anomalies appear to depict the migration pathway of fluid or molten rocks from the partial melting zone at depth toward the surface beneath the volcanic arc (Haberland et al, 2014;Koulakov et al, 2007;Wagner et al, 2007). The results of these studies have been updated using additional data from the Indonesian Meteorological, Climatological and Geophysical Agency (BMKG) catalogue (Rohadi et al, 2013). However, even this more recent investigation has not been able to image the magma reservoirs beneath Merapi in any detail due to a lack of seismic data coverage.…”

Section: Introductionmentioning

confidence: 99%

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

Ramdhan

Widiyantoro

Nugraha

et al. 2019

Journal of Asian Earth Sciences

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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.

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Section: Improved Resolution Due To the Inclusion Of Domerapi Datamentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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

Ramdhan

Widiyantoro

Nugraha

et al. 2019

Journal of Asian Earth Sciences

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“…Newer versions may be moderately different with slight variations in content. 4 structure beneath Merapi volcano (Ramdhan et al 2015(Ramdhan et al , 2016(Ramdhan et al , 2017a(Ramdhan et al , b, 2019; MERAMEX network that was consisting onshore and offshore seismographic stations in Central Java had been successfully determined crustal and upper mantle structure beneath Central and East Java, also related to the volcanic activities around the study area (Koulakov et al 2007;Wagner et al 2007;Koulakov 2009;Rohadi et al 2013;Bohm et al 2013;Zulfakriza et al 2014;Haberland et al 2014;Wölbern and Rümpker 2016; and ambient noise tomography by using both BMKG network and portable seismographs in East Java (Martha et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Double-difference earthquake relocation using waveform cross-correlation in Central and East Java, Indonesia (Preprint)

Muttaqy¹,

Nugraha²,

Puspito³

et al. 2023

Preprint

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The Central and East Java region, which is part of Sunda Arc, has relatively high seismicity rates due to the convergence between two major tectonic plates in Indonesia region, the Indo-Australian plate that subducts under the Eurasian plate. Many devastating earthquakes in the study area occurred as results of these plates interaction, such as the 1994 Banyuwangi earthquake (Mw 7.6) and the 2006 Yogyakarta earthquake (Mw 6.3). This study aims to determine the precise earthquake This manuscript is a non-peer reviewed preprint submitted to EarthArXiv. It has been under reviewed for publication to Geoscience Letters on 13 Sept 2020 with submission ID GOSL-D-19-00015R2. Newer versions may be moderately different with slight variations in content. 2 location and analyze the pattern of seismicity distribution around Central and East Java, Indonesia. We manually re-picked P and S-wave arrival time recorded by Agency for Meteorology, Climatology and Geophysics (BMKG) of Indonesia network for the times period of January 2009-September 2017. We then determined the earthquake location by a non-linear method. To improve the accuracy of earthquakes location, we relocated 1,127 out of 1,529 events using a double-difference algorithm with waveform crosscorrelation data. Overall, the seismicity around Central and East Java regions are dominantly distributed in the south of the island, e.g. Kebumen, Yogyakarta, Pacitan, Malang, and Banyuwangi cluster. These clusters are probably related to the subduction activity. Meanwhile, the shallow depth earthquakes that are clustered in mainland indicate the activity of inland faults in the region, e.g. Opak Fault, Kendeng Thrust, and Rembang-Madura-Kangean-Sakala (RMKS) fault zone. Several other active inland faults have not shown significant seismicity over the times period, i.e.,

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“…Seismological approach can also be used to understand physical parameters beneath a volcano. For example, studies using MERAMEX (Merapi Amphibious Experiment) data have resulted in some publications explaining the relation between subduction zone and volcanic arc in central Java (Wagner et al 2007;Koulakov et al 2007;Rohadi et al 2013;Haberland et al 2014). These studies depict clearly a low velocity ascending from the subducted slab to the volcanic arc, but they do not show a detailed velocity structure of Merapi due to the lack of data coverage beneath the volcano.…”

Section: Introductionmentioning

confidence: 99%

“…These models will be used to understand the deep structure of the Merapi volcano, which has not been detected clearly by previous works due to lack of data coverage. As previous volcanic studies (e.g., Lei et al 2013), a multiscale seismic tomographic imaging will be carried out utilizing the DOMERAPI and BMKG data and by incorporating the data from MERAMEX as used in previous works (Wagner et al 2007;Koulakov et al 2007;Rohadi et al 2013;Haberland et al 2014) to reconstruct magma bodies of Merapi and ascending low velocity features from the subducting slab to the volcanic arc and some other tectonic features. We will also combine data from the Center for Investigation and Technology Development of Geological Disaster, Indonesia (BPPTKG), to obtain images, especially below the Merapi summit with unprecedented detailed resolution.…”

Section: Conclusion and Further Workmentioning

confidence: 99%

Relocation of hypocenters from DOMERAPI and BMKG networks: a preliminary result from DOMERAPI project

et al. 2017

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Tomographic imaging of Central Java, Indonesia: Preliminary result of joint inversion of the MERAMEX and MCGA earthquake data

Cited by 4 publications

References 0 publications

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

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

Double-difference earthquake relocation using waveform cross-correlation in Central and East Java, Indonesia (Preprint)

Relocation of hypocenters from DOMERAPI and BMKG networks: a preliminary result from DOMERAPI project

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