Interpretation of long-offset transient electromagnetic data fromMount Merapi, Indonesia, using a three-dimensional optimizationapproach

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In the years 1998, 2000, and 2001, long-offset transientelectromagnetic (LOTEM) surveys were carried out at the active volcanoMerapi in Central Java. The measurements investigated the conductivitystructure of the volcanic edifice. Our area of interest, which is belowthe summit and the upper flanks, was investigated using horizontal andvertical magnetic field time derivative data from seventransmitter-receiver setups. Because of topography and athree-dimensional (3-D) underground structure, a 3-D interpretation isused. The method optimizes few parameters of a 3-D model by a stableleast squares joint inversion of the data, providing sufficientresolution capability. Reasonable data fits are achieved with anonhorizontally layered model featuring a very ... continued below

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Commer, Michael; Helwig, Stefan L.; Hordt, Andreas & Tezkan, Bulent June 2, 2004.

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In the years 1998, 2000, and 2001, long-offset transientelectromagnetic (LOTEM) surveys were carried out at the active volcanoMerapi in Central Java. The measurements investigated the conductivitystructure of the volcanic edifice. Our area of interest, which is belowthe summit and the upper flanks, was investigated using horizontal andvertical magnetic field time derivative data from seventransmitter-receiver setups. Because of topography and athree-dimensional (3-D) underground structure, a 3-D interpretation isused. The method optimizes few parameters of a 3-D model by a stableleast squares joint inversion of the data, providing sufficientresolution capability. Reasonable data fits are achieved with anonhorizontally layered model featuring a very conductive basement belowdepths of 1.5 km. While hydrothermal alteration is also considered, wetentatively explain the high conductivities by aqueous solutions withrelatively high salt contents. A large magma body or a small superficialreservoir below Merapi's central volcanic complex, as discussed by otherauthors, cannot be resolved by the LOTEM data.

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  • Journal Name: Journal of Geophysical Research; Journal Volume: 110; Related Information: Journal Publication Date: 2005

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  • Report No.: LBNL--63315
  • Grant Number: DE-AC02-05CH11231
  • Office of Scientific & Technical Information Report Number: 926615
  • Archival Resource Key: ark:/67531/metadc896241

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  • June 2, 2004

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  • Sept. 27, 2016, 1:39 a.m.

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  • Sept. 30, 2016, 1:54 p.m.

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Commer, Michael; Helwig, Stefan L.; Hordt, Andreas & Tezkan, Bulent. Interpretation of long-offset transient electromagnetic data fromMount Merapi, Indonesia, using a three-dimensional optimizationapproach, article, June 2, 2004; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc896241/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.