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Darmawan Denny
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Astronomy Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Mathematics Physics

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SUBSURFACE INTERPRETATION OF GEOTHERMAL MANIFESTATIONS KARANGREJO VILLAGE ARJOSARI SUBDISTRICT, PACITAN WITH GEOMAGMETIC METHOD Lestari Tri Eva; Darmawan Denny; Wibowo Nugroho Budi
Jurnal Ilmu Fisika dan Terapannya (JIFTA) Vol 5, No 1 (2016): Jurnal Fisika
Publisher : Prodi Fisika, Departemen Pendidikan Fisika

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The goal is to find out the distribution of the residual anomaly of magnetic field and identification of subsurface and cap rock geothermal manifestation in Karangrejo. Data collection was carried out during 3 days with spacing between points were 500 m and 100 m using Precision Proton Magnetometer (PPM). Data processing was done with diurnal correction, IGRF correction, topography correction, reduction to the pole and upward continuation. Interpretation process of the data was done by analyzing the local anomaly that has been done to the reduction to the pole and upward continuation to a height of 300 m which has been modeled using Mag2DC software. Interpretation results show that the value of local anomaly magnetic field to the pole is -600 nT to 100 nT while interpretation of the results of 2 slices model indicate het domination of lava rock and breccia rock
UNDERGROUND INTERPRETATION OF POSSIBLE LANDSLIDE ZONE IN GERBOSARI VILLAGE, SAMIGALUH DISTRICT, KULONPROGO REGENCY USING GEOELECTRIC METHOD WITH DIPOLE-DIPOLE CONFIGURATION Purnama Aditya; wibowo Nugroho Budi; Darmawan Denny
Jurnal Ilmu Fisika dan Terapannya (JIFTA) Vol 5, No 2 (2016): Jurnal Fisika
Publisher : Prodi Fisika, Departemen Pendidikan Fisika

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The research aimed to identify the underlying structure of probable landslide zone in Gerbosari village, and toidentify the depth of slip plane according to resistivity value. This research was conducted using resistivity methodwith dipole-dipole configuration in Jetis subvillage, Jati subvillage and Dukuh subvillage, Gerbosari Village,Samigaluh District, Kulonprogo Regency. The main instrument used for data collecting is resistivitymeter NaniuraNRD 22 S. The scope area of the research was 1,1 x 0,5 km consisted of 3 lines of survey while the precise locationof the research lied at coordinate of 7⁰39’54,90” S to 7⁰40’20,94” S and 110⁰10’02,79 E to 110⁰10’17,00” E. Theresult of the measurement is processed using Res2dinv software that showed 2D layer. Geomorphologicalcharacteristics are dominated by clay, sandy clay, limestone and andesite rock. In the layer of line 1 at Jetissubvillage the resistivity value of slip plane is 147-489 Ωm with 7,19-8,50 meter of depth which is assumed aslayer of andesite. In the layer of line 2 at Jati subvillage the resistivity value of slip plane is 389-2171 Ω m with6,33-8,50 meter of depth which is predicted to be layer of limestone. In the third layer of line 3 at Dukuh subvillagethe resistivity value of slip plane is 315-1293 Ωm and interpreted as limestone, while the depth of the slip planehas not yet predicted.Keywords: Geoelectric, slip plane, landslide, Gerbosari
IDENTIFICATION OF GRINDULU MINOR FAULT LINES BASED ON MAGNETIC FIELD ANOMALY DATA Nurrohman Aryo Seno; wibowo Nugroho Budi; Darmawan Denny
Jurnal Ilmu Fisika dan Terapannya (JIFTA) Vol 5, No 2 (2016): Jurnal Fisika
Publisher : Prodi Fisika, Departemen Pendidikan Fisika

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AbstractThis research aimed to determine the fault direction, pattern of magnetic field anomaly and the subsurfacestructure of Grindulu minor fault in Arjosari subdistrcict. Magnetic field anomaly data acquisitons were takenfrom 19 points with 500 m grid spacing using Proton Precession Magnetometer (PPM) type G-856AX with loopingmethod. The results indicate that Grindulu minor fault has a N32˚E direction. Pattern of magnetic field in Grinduluminor fault was around -360nT to 120 nT. The subsurface structure of Grindulu Minor fault in Arjosari subdistrictwas composed by Arjosari formation and Mandalika formation dominated by rocks lava and breccia tufa withsusceptibility of 1.7 (in the SI) and 1.2 (in the SI) at the depth of (200-400) m.Keywords: Geomagnetic Method, Grindulu Minor Fault, Suseptibility, Magnetic Field Anomaly
AQUIFER IDENTIFICATION IN OPAK FAULT ZONE AFTER YOGYAKARTA EARTHQUAKE 2006 WITH SCHLUMBERGER CONFIGURATION GEOELECTRIC METHOD Prihastiwi Fifi; wibowo Nugroho Budi; Darmawan Denny
Jurnal Ilmu Fisika dan Terapannya (JIFTA) Vol 5, No 2 (2016): Jurnal Fisika
Publisher : Prodi Fisika, Departemen Pendidikan Fisika

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This research was aimed to determine resistivity values of aquifer constituent rocks, and todetermine aquifer characteristics and hydrostratigraphy in Opak fault zone. The location of researchwas at Opak fault line Paten subvillage, with geographical coordinate of 7°55'18,39'' S to 7°57'09,72''S and 110°19'22,26'' E to 110°22'56,06'' E. The method used was Schlumberger configurationgeoelectric method. Geoelectric method was one of the geophysics method which study earthelectricity based on the Ohm’s Law, by injecting a current through two current electrodes, thepotential different appeared from two potential electrodes can be measured. The data acquisition usedNaniura NRD 22S resistivitymeter. Number of sounding point were 3 points spaced by 10 meters andmeasurement line length was 160 meters. Measurement results were analized using curve matchingmethod by IPI2win software determine subsurface layers based on resistivity. Results showed thatresistivity aquifer constituent rocks are about 19,3-300 Ωm which are sands, gravels, sandstones rocktypes at 5-30 meters depth.Keywords: Geoelectric Method, Aquifer, Paten Subvillage
Co-Authors Lestari Tri Eva Nurrohman Aryo Seno Prihastiwi Fifi Purnama Aditya Wibowo Nugroho Budi