Email: david.sahara@gf.itb.ac.id
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Publications

Journal Publications

International Journal publications

  1. Sahara, D.P.; Seithel, R.; Kohl, T.; (review process): In-situ stress indicators for a fractured crystalline granite at great depth. Submitted to Geothermics
  2. Sahara, D.P.; Kusumawati, D.; Puspito, N.T.; Nugraha, A.D.; Triyoso, W.; Zulfakriza, Z.; (review process): Inferring the Aceh 2016 Mw 6.5 earthquakes interaction using stress triggering concept. Submitted to Pure and Applied Geophysics
  3. Kusumawati, D.; Sahara, D.P.; Nugraha, A.D.; Puspito, N.T.; (accepted): Sensitivity of static Coulomb stress change in relation to source fault geometry and regional stress magnitude: Case study of the 2016 Aceh earthquake (Mw 6.5), Indonesia. has been accepted in Journal of Seismology, DOI:10.1007/s10950-019-09878-3
  4. Sahara, D.P.; Widiyantoro, S.; (2019): The pattern of local stress heterogeneities along the central part of the Great Sumatran fault: A preliminary result. In Journal of Physics: Conference Series, Volume 1204, conference 1, DOI:10.1088/1742-6596/1204/1/012091
  5. Natania, K.A.; Sahara, D.P.; Nugraha, A.D.; Ramadhan, I.; (2019): The Physical Mechanisms of Geothermal Reservoir During Hydraulic Injection Through Microearthquake Tomography. In Journal of Physics: Conference Series, Volume 1204, conference 1, DOI:10.1088/1742-6596/1204/1/012081
  6. Hijriani, A.; Sahara, D.P.; Nugraha, A.D.; Ramadhan, I.; Sidik, R.P.; (2019): Utilization of Double-Difference Tomography for Geothermal Exploration: 3D Seismic Velocity Structure Interpretation and Fluid Determination. In Journal of Physics: Conference Series, Volume 1204, conference 1, DOI:10.1088/1742-6596/1204/1/012094
  7. Kusumawati, D.; Sahara, D.P.; Nugraha, A.D.; Puspito, N.T.; (2019): Stress drop, earthquake aftershocks and regional stress relation based on synthetic static Coulomb failure stress model. In Journal of Physics: Conference Series, Volume 1204, conference 1, DOI:10.1088/1742-6596/1204/1/012092
  8. Suhendi, C.; Fatkhan; Sahara, D.P.; Sule, M.R.; (2019): Modeling The Behavior of CO2 Injection in a Sand Reservoir. In Journal of Physics: Conference Series, Volume 1204, conference 1, DOI:10.1088/1742-6596/1204/1/012089
  9. Fatkhan; Suhendi, C.; Sahara, D.P.; Sule, M.R.; (2019): Modeling Geomechanical Responses Induced by CO2 Injection in CCS Pilot Project in Gundih Field, Indonesia. In Journal of Physics: Conference Series, Volume 1204, conference 1, DOI:10.1088/1742-6596/1204/1/012106
  10. Ry, R.V.; Sahara, D.P.; Rohaman, M.; Suhendi, C.; Palgunadi, K.H.; Widiyantoro, S.; Nugraha, A.D.; Yudistira, T.; Prabowo, B.S.; Mujihardi, B.; (2019): Implementation of GMSTech-a New Practical Software for Microseismic Data Processing for Estimating Event Source Parameters. In Journal of Physics: Conference Series, Volume 1204, conference 1, DOI:10.1088/1742-6596/1204/1/01209
  11. Sahara, D. P.; Widiyantoro, S.; Irsyam, M.; (2018): Stress heterogeneity and its impact on seismicity pattern along the equatorial bifurcation zone of the Great Sumatran Fault, Indonesia. In Journal of Asian Earth Sciences, vol 164, pp 1-8. DOI: 10.1016/j.jseaes.2018.06.002
  12. Sahara, D. P.; Schoenball, M.; Gerolymatou, E.; Kohl, T.; (2017): Analysis of borehole breakout development using continuum damage mechanics. In International Journal of Rock Mechanics and Mining Sciences, vol 97, pp. 134-143. DOI: 10.1016/j.ijrmms.2017.04.005
  13. Meller, C., Bremer, J., Baur, S., Bergfeldt, T., Blum, P., Canic, T., Eiche, E., Gaucher, E., Hagenmeyer, V., Heberling, F., Held, S., Herfurth, S., Isele, J., Kling, T., Kuhn, D., Kumar, A., Mayer, D., Müller, B., Neumann, T., Nestler, B., Nitschke, F., Nothstein, A., Nusiaputra, Y., Orywall, P., Peters, M., Sahara, D. P., Schäfer, T., Schill, E., Schilling, F., Schröder, E., Selzer, M., Stoll, M., Wiemer, H.-J., Wolf, S., Zimmermann, M. and Kohl, T (2016): Integrated research as key to the development of a sustainable geothermal energy technology. In Energy Technology. DOI: 10.1002/ente.201600579
  14. Sahara, D. P.; Schoenball, M.; Kohl, T.; Müller, B.I.R. (2014): Impact of fracture networks on borehole breakout heterogeneities in crystalline rock. In International Journal of Rock Mechanics and Mining Sciences, vol 71, pp. 301–309. DOI: 10.1016/j.ijrmms.2014.07.001
  15. Schoenball, M.; Sahara, D. P.; Kohl, T. (2014): Time-dependent brittle creep as a mechanism for time-delayed wellbore failure. In International Journal of Rock Mechanics and Mining Sciences 70 (0), pp. 400–406. DOI: 10.1016/j.ijrmms.2014.05.012
  16. Luehr, B.G., Koulakov, I., Rabbel, W., Zschau, J., Ratdomopurbo, A., Brotopuspito, K.S., Fauzi, Sahara, D.P. (2013): Fluid ascent and magma storage beneath Gunung Merapi revealed by multi-scale seismic imaging. In Journal of Volcanology and Geothermal Research, vol 261, pp 7-19, ISSN 0377-0273, DOI: 10.1016/j.jvolgeores.2013.03.015.

National Journal publications

  1. Naamin, K.N.; Sahara, D.P.; Nugraha, A.D.; Ramadhan, I. (2018): Application of Double Difference Tomography Method to Determine The 3D Seismic Wave Velocity Structure of GoLF Geothermal Field, in Jurnal Geofisika (JGF) HAGI, vol 16, pp 27-33, ISSN 2477-6084
  2. Hijriani, A.; Sahara, D.P.; Nugraha, A.D.; Ramadhan, I.; Sidik, R.P. (2017): Peningkatan Akurasi Lokasi Gempa Mikro Dengan Menggunakan Metoda Double-Difference Dan Korelasi Silang Master Waveform,  in Jurnal Geofisika (JGF) HAGI, vol 15, pp 21-25, ISSN 2477-6084
  3. Sahara, D. P.; Kusumo, A. W.; Widiyantoro, S.; Sule, M. R. (2011): Aplikasi Metode Double Differential Untuk Penentuan Relokasi Hiposenter Gempa Vulkanik Gunung Kelud Secara Akurat, in Jurnal Teknologi Mineral (JTM) ITB

Scopus-indexed Proceeding

  1. Sahara, D.P.; Kusumawati, D.; Afnimar; Triyoso, W.; Widiyantoro, S.; Nugraha, A.D.; Puspito, N.T; (2018): Introduction to stress triggers, stress shadows and their implications for seismic hazard in Indonesia. In AIP Conference Proceedings 1987, 020033 (2018); https://doi.org/10.1063/1.5047318
  2. Ramadhan, A.R.; Kusumawati, D.; Sahara, D.P.; Widiyantoro, S.; (2018): Preliminary focal mechanism pattern along the central part of the Great Sumatran Fault, Indonesia. In AIP Conference Proceedings 1987, 020047 (2018); https://doi.org/10.1063/1.5047332
  3. Husni, Y.M.; Nugraga, A.D.; Rosalia, S.; Zulfakriza; Sahara, D.P.; (2018): Aftershock location determination of the 27 May 2006, M 6.4 Yogyakarta earthquake using a non-linear algorithm: A preliminary results. In AIP Conference Proceedings 1987, 020049 (2018); https://doi.org/10.1063/1.5047334
  4. Agustina, A.; Sahara, D.P.; Nugraha, A.N.; (2017): Iterative joint inversion of in-situ stress state along Simeulue-Nias Island. In AIP Conference Proceedings 1857, 020001 (2017); https://doi.org/10.1063/1.4987043
  5. Kusumawati, D.; Sahara, D.P.; Widiyantoro, S.; (submitted): Analysis of Earthquake Multiplets in the Central Part of Sulawesi Using Waveform Cross Correlation: A Preliminary Result. In IOP Conference Proceedings of Padjadjaran Earth Dialogues 2018, Bandung, Indonesia

Selected conferences and workshops

  • Sahara, D. P.; Schoenball, M.; Kohl, T; Gerolymatou, E. (2015): Modeling of inelastic failure leading to borehole breakout, in 4th European Geothermal Workshop, Strasbourg, France
  • Sahara, D. P.; Schoenball, M.; Kohl, T; Mueller, B. (2015): Analysis of Stress Heterogeneities in Fractured Crystalline Reservoir, in World Geothermal Congress 2015, Australia-New Zealand
  • Sahara, D. P.; Schoenball, M.; Kohl, T; Mueller, B. (2014): Breakout Orientation Perturbation Modeling in Fractured Crystalline Rock, in 3rd European Geothermal Workshop, Karlsruhe, Germany
  • Sahara, D. P.; Schoenball, M.; Kohl, T. (2013): The role of active fractures on borehole breakout development, in American Geosciences Union Fall Meeting 2013, San Francisco, USA
  • Sahara, D. P.; Kohl, T. (2013): Stress heterogeneity in the fractured crystalline reservoir, in 2nd European Geothermal Workshop, Strasbourg, France
  • Schoenball, M.; Sahara, D. P.; Kohl, T. (2013): Time-dependent brittle creep as mechanism for time-delayed wellbore failure, in 6th International Symposium on In-Situ Rock Stress Sendai, Japan
  • Sahara, D. P.; Kohl, T. (2013): Importance of active fractures in the borehole breakouts heterogeneity, in 9th International Geothermal Conference 2013, Freiburg, Germany (invited paper)
  • Sahara, D. P.; Kohl, T.; Schoenball, M. (2012): Numerical calculation of a stress field near a borehole under complex conditions, in Celle International Drilling Workshop, Celle, Germany
  • Sahara, D. P.; Widiyantoro, S.; Nugraha, A.D.; Sule, M. R.; Lühr, B.G. (2011): Understanding the mechanism of subduction process and its implication to surface seismicity and volcanic activity in Central Java – Indonesia from high resolution tomography, in SEGJ International Symposium, Kyoto, Japan
  • Sule, M. R.; Sahara, D. P.; Kusnadi, Y.; Imaduddin, I; Nugraha, A; Nugraha, A.D.; Setiawan, T.; Widiyantoro, S.; Matsuoka, T. (2011):  Development of Hard- and Software of Microseismic for Geothermal Exploration and Monitoring, in World Renewable Energy Congress, Denpasar, Indonesia
  • Sahara, D. P.; Widiyantoro, S,; Nugraha, A. D.; Sule, M. R.; Lühr, B. G. (2011): Resolution Improvement of The Tomographic Inversion by Incorporating Difference Data: Case Study of Meramex Data From Central Java – Indonesia, Joint Conference Meeting HAGI-IAGI, Makasar, Indonesia
  • Sahara, D.P.; Widiyantoro, S.; Nugraha, A.D.; Sule, M. R.; Luehr, B. G. (2011): Determination of Subsurface Velocity Structure and Precise Hypocenter Relocation by using Double-Difference Technique: Case Study of MERAMEX Data from Central Java – Indonesia, European Geothermal Union, Viena, Austria
  • Lühr, B.G.; Koulakov, I.; Rabbel, W.; Zschau, J.; Ratdomopurbo, A.; Brotopuspito, K.S.; Fauzi, Sahara, D. P. (2011): Fluid Ascent and Magma Storage Beneath Gunung Merapi, European Geothermal Union, Viena, Austria