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Rina Dwi Indriana
Laboratorium Geofisika FMIPA Universitas Diponegoro
Physics

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Analisis Sudut Kemiringan Lempeng Subduksi di Selatan Jawa Tengah dan Jawa Timur Berdasarkan Anomali Gravitasi dan Implikasi Tektonik Vulkanik Dwi Indriana, Rina
BERKALA FISIKA Vol 11, No 3 (2008): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Gravitation anomaly research had been done to predict the subduction dip and model. The gravitation research covered East and Central Java, Indonesia. Upward continuation used for regional anomaly mapping. Two dimension modeling from each cross-sectional used grav2poly or grav2dc. From 2D model subduction dip was calculated. The research result were subduction dip various between 3,40 to 8,20. There is a suggestion that low magnitude of dip correlated with volcano activity and high magnitude of dip correlated with some depresstion zone. Key word: subduction zone, subduction dip, gravitation modeling
Estimasi Ketebalan Sedimen dan Kedalaman Diskontinuitas Mohorovicic Daerah Jawa Timur dengan Analisis Power Spectrum Data Anomlai Gravitasi Dwi Indriana, Rina
BERKALA FISIKA Vol 11, No 2 (2008): Berkala Fisika
Publisher : BERKALA FISIKA

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Gravitation anomaly research had been done to predict the depth of sediment. The gravitation research covered East Java from north coast to south coast, Indonesia. By using power spectrum method the average of sediment depth could predicted. Power spectrum method based on FFT theorem. A Short wavelength signal was correspond to narrow source and a long waveleght signal corresponds with shallow source. The power spectrum result was two discontinuities. The depth of narrow discontinuity is 2,7 km and 25,6 for the shallow continuity. The shallow discontinuity predicted as Mohorovicic layer.  Keyword: power spectrum, gravitation anomaly, discontinuity
PEMODELAN ZONA SESAR OPAK DI DAERAH PLERET BANTUL YOGYAKARTA DENGAN METODE GRAVITASI Nurwidyanto, M. Irham; Dwi Indriana, Rina; Thaha Darwis, Zukhrufuddin
BERKALA FISIKA Vol 10, No 2 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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A gravity research was done in Pleret, Bantul, Yogyakart.It’s covering 55 measurements points. This research aims to estimated subsurface structure  fault zone of the area, correctly along Opak River’s. Type of Gravitymeter La Coste & Romberg G-1118 using electronics feedback system with accuracy 0.005 miligal was used to measure gravitational field. Interpretation result from kualitative and kuantitative  are  estimated the structure in the research area consist of tree layer that arre  limestone, breccia, and alluvial sediment and Opak sediment’s
Uji Nilai Tahanan Jenis Polutan Air Laut Dengan Metode Ohmik Dan Geolistrik Tahanan Jenis Skala Laboratorium Dwi Indriana, Rina; Danusaputro, Hernowo
BERKALA FISIKA Vol 9, No 3 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Geoelectric method and ohmic method used to investigate sea water intrution (salinity) in aquifer layer.Resistivity data aquisition for 3 layer model and 3 concentration of salinity was in laboratory scale. By comparing resistivity data before and after adding sea water we get resistivity value for each layer. The research result is decreasing of resistivity value for increasing salinity concentration.   
Interpretasi Bawah Permukaan Dengan Metode Self Potential Daerah Bledug Kuwu Kradenan Grobogan Dwi Indriana, Rina; Nurwidyanto, M. Irham; W. Haryono, Kurnia
BERKALA FISIKA Vol 10, No 3 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The geophysics research to observe the subsurface anomaly in Bledug Kuwu had been done. It was used to analyze and interpret the potential data. The purpose of this research was to interpret the object of subsurface anomaly. The research was used self potential method with base point electrode configuration. Data processed used Surfer 8 software, which result was an isopotential contour map. The modeling processed used curve matching for a spherical model. By using Bhattacharya theory, the depth and polarization angle was founded as the parameter of a spherical model. The research’s result of the depth of anomaly origin is 19,5 m, 23,68m, and 40,8 m. The polarization angle is 70o, 70,38o and 100o.   Keywords: Bledug Kuwu, self potential, spherical model  
Co-Authors Hernowo Danusaputro Irham Nurwidyanto Kurnia W. Haryono Zukhrufuddin Thaha Darwis