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Adi Susilo
Jurusan Fisika Fakultas MIPA Universitas Brawijaya
Environmental Science

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Estimation of 2½ Dimensional Surface Structure in Kelud Volcano Region Based on Gravity Survey M. Rahman; Sunaryo Sunaryo; Adi Susilo
Natural B, Journal of Health and Environmental Sciences Vol 2, No 3 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1003.98 KB) | DOI: 10.21776/ub.natural-b.2014.002.03.3

Abstract

The research in the area around Kelud Volcano based on gravity survey has been conducted in order to determine  subsurface structure and constituent composition. The research was done in July 2012 - May 2013 in the area around Kelud Volcano covered Blitar, Kediri, Wlingi, and Ngantang. In this research, the equipment that been used is gravity-meter Lacoste & Romberg type G-105. Analysis of data from field measurements performed with the followed step: calculated the correction of Bouguer anomaly, projected to the flat plane and separated regional anomaly and residual anomaly with polynomial fitting method. Interpretation was performed on three cross sections: section AB, CD, and EF. For results of cross-section AB, the values of ρ for andesite, lava, basalt and sandstone are 2.61 gr/cm3, 3.1 gr/cm3, 2.99 gr/cm3 and 1.61 gr/cm 3respectively. For cross-section CD, the values of ρ for andesite and sediment are 2.5 gr/cm3and 2.38 gr/cm3. For cross-section EF, the values of ρ for basalt, sandstone, and sediment are 2.85 gr/cm3, 1.6 gr/cm3, and 2.4 gr/cm3. From the results of models shows that basalt and andesite rocks is dominant in the region of Kelud Volcano.
Prediction of Structure Pouch Magma Volcano Kelud Gravity Data Based Method Using Equivalent Point Mass Sandy Vikki Ariyanto; Sunaryo Sunaryo; Adi Susilo
Natural B, Journal of Health and Environmental Sciences Vol 2, No 3 (2014)
Publisher : Natural B, Journal of Health and Environmental Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (987.053 KB) | DOI: 10.21776/ub.natural-b.2014.002.03.4

Abstract

The observation has been done by gravity method on the date of 1 July to 12 August 2012 in the Kelud volcano area, Pare, Kediri, Blitar and Ngantang in order to determine the structure of magma pocket. Data analisis from field measurements performed with the following correcting the data includes: convert to mgal, drift correction, tidal correction, latitude correction and topography correction, then obtained a complete Bouguer anomaly values. Subsequently projected onto a flat surface (Damnpey) by using matlab program and resolve regional anomalies with anomaly residual. Qualitative interpretation is done by reading the complete Bouguer anomaly contour pattern, while the quantitative interpretation is done by creating a 2D cross section on the four A-A’, B-B’, C-C’, and D-D’ lines.Based on projection to the flat surface (Dampney) with equivalent field depth of 3500 and equivalent field height of 200 obtained convergent anomaly contour so that anomaly values become stable, based on quantitative interpretation 2D cross section model of A-A’, B-B’, C-C’ and D-D’ lines and describing structure of magma pocket. Slice anomali density contrast of A-A’ at  -2,930 gr/cm3 assumed as magma chamber with 900 meter dept while B-B’ slice at -2,910 gr/cm3assumed as magma chamber with 943 meters dept, C-C’ slice at -2,930 gr/cm3 assumed as magma chamber with 914 meters depth, and D-D’ slice at -2,930 gr/cm3 assumed as magma chamber with 943 meters depth. 
Co-Authors M. Rahman Sandy Vikki Ariyanto Sunaryo Sunaryo