The realization of local earthquake tomography is usually conducted by removing distant events outside the study region, because these events may increase errors. In this study, tomographic inversion has been conducted using the travel time data of local and regional events in order to improve the structural resolution, especially for deep structures. We used the local MERapi Amphibious EXperiments (MERAMEX) data catalog that consists of 292 events from May to October 2004. The additional new data of regional events in the Java region were taken from the Meteorological, Climatological, and Geophysical Agency (MCGA) of Indonesia, which consist of 882 events, having at least 10 recording phases at each seismographic station from April 2009 to February 2011. We have conducted joint inversions of the combined data sets using double-difference tomography to invert for velocity structures and to conduct hypocenter relocation simultaneously. The checkerboard test results of Vp and Vs structures demonstrate a significantly improved spatial resolution from the shallow crust down to a depth of 165 km. Our tomographic inversions reveal a low velocity anomaly beneath the Lawu - Merapi zone, which is consistent with the results from previous studies. A strong velocity anomaly zone with low Vp, low Vs and low Vp/Vs is also identified between Cilacap and Banyumas. We interpret this anomaly as a fluid content material with large aspect ratio or sediment layer. This anomaly zone is in a good agreement with the existence of a large dome containing sediment in this area as proposed by previous geological studies. A low velocity anomaly zone is also detected in Kebumen, where it may be related to the extensional oceanic basin toward the land.
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9 September 2013
PADJADJARAN INTERNATIONAL PHYSICS SYMPOSIUM 2013 (PIPS-2013): Contribution of Physics on Environmental and Energy Conservations
7–9 May 2013
Universitas Padjadjaran, West Java-Indonesia
Research Article|
September 09 2013
Tomographic imaging of Central Java, Indonesia: Preliminary result of joint inversion of the MERAMEX and MCGA earthquake data
Supriyanto Rohadi;
Supriyanto Rohadi
Study Program of Earth Sciences, Faculty of Earth Sciences and Technology, Institute of Technology Bandung, Jl. Ganesha No.10, Bandung 40132, Indonesia and Meteorological, Climatological, and Geophysical Agency, Jl. Angkasa 1 No.2, Kemayoran, Jakarta,
Indonesia
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Sri Widiyantoro;
Sri Widiyantoro
Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institute of Technology Bandung, Jl. Ganesha No.10, Bandung 40132,
Indonesia
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Andri Dian Nugraha;
Andri Dian Nugraha
Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institute of Technology Bandung, Jl. Ganesha No.10, Bandung 40132,
Indonesia
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Masturyono
Masturyono
Meteorological, Climatological, and Geophysical Agency, Jl. Angkasa 1 No.2, Kemayoran, Jakarta Pusat,
Indonesia
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AIP Conf. Proc. 1554, 234–237 (2013)
Citation
Supriyanto Rohadi, Sri Widiyantoro, Andri Dian Nugraha, Masturyono; Tomographic imaging of Central Java, Indonesia: Preliminary result of joint inversion of the MERAMEX and MCGA earthquake data. AIP Conf. Proc. 9 September 2013; 1554 (1): 234–237. https://doi.org/10.1063/1.4820328
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