Doddy Sutarno

• Doctor of Philosophy
• Head of Department at Bandung Institute of Technology

Limboto Lake—Pentadio area is located in the province of Gorontalo on the northern arm of Sulawesi Island, Indonesia, which experienced a tectonic process from the Sula Platform collision in the mid-Miocene. This tectonic process led to the westward subduction of the early Miocene and post-collision rifting and uplifting of the arc and subduction a...

Surakarta City is the center of economic activity in the great Solo area. As a result, land use changes occur very quickly. This study aims to identify land use and land changes due to their effects on groundwater levels in Surakarta City. The method used in this research is a descriptive-quantitative method. The analysis technique used is time ser...

A nonlinear stochastic inversion scheme, called very fast simulated annealing (VFSA), was applied to the time-domain electromagnetic data generated from a horizontal electric dipole. The forward formulation of the vertical magnetic field was expressed in the Laplace domain by applying the Hankel integral transform. Time-domain transformation was pe...

This study investigates the subsurface structure of the Mas Crater area in Papandayan Volcano, Indonesia, using magnetotelluric and geomagnetic total intensity methods. The results reveal a three-layer resistivity structure, with a conductive middle layer interpreted as a hydrothermal zone, and a low-susceptibility anomaly beneath fumaroles, likely...

In the last two decades, the city of Surakarta has shown significant population development, as well as in industry and tourism. This development must be accompanied by the provision of water resources for the lives of the population. As we know that in 2015 and 2019, there was a long dry season that resulted in a lack of water for residents and fo...

Global optimization inversion of grounded wire time-domain electromagnetic (TDEM) data was implemented through application of the particle swarm optimization (PSO) algorithm. This probabilistic approach is an alternative to the widely used deterministic local-optimization approach. In the PSO algorithm, each particle that constitutes the swarm epit...

Edge finite element (finite vector element), which is solved using a sparse direct solver (PARDISO) has been used in this paper to model 2-D magnetotelluric field data (Papandayan field data). The site sounding of the field data which is used on this modeling is eight site soundings. Before using this program to model Papandayan field data, our pro...

We have implemented a sparse direct solver in our transverse electric mode magnetotelluric inversion program. The two-dimensional inversion program was built on using edge finite element modeling. We also use the singular value decomposition (SVD) method in the inversion program. We test the inversion program using three different synthetic models.

As exploration is forced into more difficult areas with complex three-dimensional (3-D) structural environments, the importance of 3-D magnetotelluric (MT) modeling is essential for the correct interpretation of MT data. To reduce the complexity of the calculations introduced by 3-D models, iterative forward calculation of MT response functions is...

An integrated Controlled-source audio frequency magnetotelluric (CSAMT) and gravity investigations across the Tangkuban Parahu area has been carried out. The Tangkuban Parahu is located in Bandung, West Java, one of a volcano area. The purpose of the investigations was to locate the subsurface structures of the area that may correlate to a geotherm...

The late research, linear matrices of vector finite element in two dimensional(2-D) magnetotelluric (MT) responses modeling was solved by non-sparse direct solver in TE mode. Nevertheless, there is some weakness which have to be improved especially accuracy in the low frequency (10⁻³ Hz-10⁻⁵ Hz) which is not achieved yet and high cost computation i...

In this work, an inversion scheme was performed using a vector finite element (VFE) based 2-D magnetotelluric (MT) forward modelling. We use an inversion scheme with Singular value decomposition (SVD) method toimprove the accuracy of MT inversion.The inversion scheme was applied to transverse electric (TE) mode of MT. SVD method was used in this in...

Tangkuban Parahu is located in Bandung, West Java, one of a volcano area. Controlled-source audio frequency magnetotelluric (CSAMT) survey has been conducted in the area using transmitter located in 3-5 km from the survey area. The objective of the survey was to determine a subsurface resistivity structures that may correlate to a geothermal reserv...

Mise-á-la-masse (MAM) measurement has been carried out in the Mataloko geothermal field, Flores, East Nusa Tenggara. The survey was conducted along 16 survey lines in a radial configuration to collect 176 sounding sites. The purpose of the measurement is to image a promising reservoir zone and to correlate the results with the previous geosciences...

Controlled-source audio frequency magnetotelluric (CSAMT) survey consisting of 60 soundings has been carried out in the Kamojang geothermal field to delineate resistivity structure correlated to the present geothermal reservoir. The transmitter site was located about 3 − 5 km in the south-west of the survey area. The sounding sites were distributed...

In this work, we seek numerical solution of 3-D Magnetotelluric (MT) using edge- based finite element method. This approach is a variant of standard finite element method and commonly referred as vector finite-element (VFE) method. Nonphysical solutions usually occurred when the solution is sought using standard finite element which is a node based...

Shallow resistivity structure around Nakadake craters has been revealed by extensive VLF- MT survey from August to October 2006. This structure comprises a varied resistivity value at the upper and bottom layer of the western flank of craters; a conductive upper layer at the fourth Crater; and a resistive upper layer at southern part of craters. Th...

Magnetotelluric (MT) is a passive electromagnetic (EM) method which measure natural variations of electric and magnetic vector fields at the Earth surface to map subsurface electrical conductivity/resistivity structure. In this study, we obtained numerical solution of three-dimensional (3-D) MT using vector finite element method by solving second o...

Today the Electromagnetic methods such as magnetotellurics (MT) and controlled sources audio MT (CSAMT) is used in a broad variety of applications. Its usefulness in poor seismic areas and its negligible environmental impact are integral parts of effective exploration at minimum cost. As exploration was forced into more difficult areas, the importa...

Accurate modeling and estimation of impedance functions is essential for the correct interpretation of Controlled Source Audio Magnetotelluric (CSAMT) measurements. Non plane wave effect of CSAMT source and noises are inevitably encountered when CSAMT observations are conducted and, consequently, impedance estimates are usually based on least-squar...

Earth electrical / geoelectrical conductivity may vary in any direction in a complex earth model. When conductivity only varying within one direction such as depth, it is considered as an one-dimensional (1-D) structure model. Two-dimensional (2-D) and three-dimensional (3-D) structure have more degrees of conductivity variation. In magnetotelluric...

In conventional controlled-source audio-magnetotelluric (CSAMT) prospecting, scalar CSAMT measurement is usually performed because of its simplicity and low operational cost. Since the structure of earth's conductivity is complex, the scalar CSAMT method can lead to a less accurate interpretation. The complex conditions need more sophisticated meas...

Magnetotelluric data acquisition sometimes should be taken on topographic terrain, for example on the mountainous zones. The variety of topography around the point of measurement yields additional effects on the data obtained. Therefore, the modeling of MT responses in the topographic terrain is very necessary to get a complete understanding of top...

Magnetotelluric (MT) is one of the geophysical methods which are used in mapping subsurface resistivity distribution of the earth by utilizing electromagnetic (EM) wave as an energy source. Through the measurement of electric and magnetic field in orthogonal direction above the surface of the earth, resistivity distribution of the subsurface can be...

Sumatran Fault Zone is the most active fault in Indonesia as a result of strike-slip component of Indo-Australian oblique convergence. With the length of 1900 km, Sumatran fault was divided into 20 segments starting from the southernmost Sumatra Island having small slip rate and increasing to the north end of Sumatra Island. There are several geoph...

Papandayan volcano is an active volcano situated in Garut, West Java Indonesia. In 2002 eruption, it released pyroclastic volcanic material to the surface covering the 4 km2 area on the summit to the north part of the volcano and formed new craters on the summit. We have undertaken several geophysical measurements in period of 2008 - 2011 including...

Robust magnetotelluric (MT) response function estimators are now in standard use by the induction community. Properly devised and applied, these have ability to reduce the influence of unusual data (outliers). The estimators always yield impedance estimates which are better than the conventional least square (LS) estimation because the `real' MT da...

Robust impedance estimation procedures are now in standard use in magnetotelluric (MT) measurements and research. These always yield impedance estimates which are better than the conventional least square (LS) estimation because the 'real' MT data almost never satisfy the statistical assumptions of Gaussian distribution upon which normal spectral a...

Accurate estimation of impedance functions is essential for the correct interpretation of magnetotelluric (MT) measurements. Noise is inevitably encountered when MT observations are conducted and, consequently, impedance estimates are usually based on least-squares (LS) regression. Least squares ultimately assumes simple Gaussian statistics. Howeve...

An accurate estimate of impedance functions is essential for the correct interpretation of a magnetotelluric (MT) sounding. Unfortunately, noise is inevitably encountered when the MT observation is conducted. In effect this can strongly influence the results given by the MT process and results in a distortion of the estimate. This paper proposes an...

In situations in which Gaussian error assumptions are not valid, estimation procedures based on the least squares (LS) algorithm can be seriously misleading. It is then essential to use statistical procedures that are robust, in the sense of being relatively resistant or insensitive to the presence of a moderate number of outliers (abnormal data) s...

This paper presents the modeling of 2D CSAMT responses generated by horizontal electric dipole using the separation of primary and secondary field technique. The primary field is calculated using 1D analytical solution for homogeneous earth and it is used to calculate the secondary electric field in the inhomogeneous Helmholtz Equation. Calculation...

Transformation of VLF-EM signals, which are approximated as the real and imaginary components of the ratio between the vertical and the horizontal components of magnetic fields was carried out in this study to improve the quantitative interpretation aspect of VLF analysis. The transformation filter has been tested using synthetic data generated by...