Jiri Zahradnik

Professor of Geophysics


Charles University in Prague, Faculty of Mathematics and Physics, Department of Geophysics.
Mail address: KG MFF UK, V Holesovickach 2, 180 00 Praha 8, Czech Republic
Phone: (+420-2) 2191 2546
FAX: (+420-2) 2191 2555
E-mail: jz@karel.troja.mff.cuni.cz



·        ISOLA code to calculate centroid moment tensors


My most recent updates: http://geo.mff.cuni.cz/~jz/for_Costa_Rica/


Publications (status November 2018):

·        91 papers in reviewed journals (according WoS)

·        of about 90 papers in conference proceedings and reports

·        1164 citations (according WoS, without self-citations)

·         H-index: 22 


Personal data and positions held:

·        Born June 11, 1947 in Prague; Czech nationality

·        1966-1970: Studies at the Faculty of Mathematics and Physics, Charles University Prague

·        1970: RNDr degree (equivalent to MSc)

·        1976: CSc degree (equivalent to PhD)

·        2001: DrSc degree

·        1970: Research assistant

·        1975: Assistant professor

·        1992: Associate professor

·        1993-2006: Head of the Department of Geophysics

·        2006-2010: Vice-Head of the Department of Geophysics

·        2006- present: Professor of Geophysics



Papers (after 2005):


These items may be protected by copyright. Use of these items is limited to non-profit, non-commercial, educational and research purposes. They are for download, not for redistribution.



·        Zahradník, J., E. Sokos, V. Plicka (2018). Zakynthos 25/10/2018, Mw 6.8 earthquake: Superposition of strike-slip and thrust? Report to EMSC. PDF

·        Carvalho, J., L. V. Barros, and J. Zahradnik (2018). Inversion for focal mechanisms using waveform envelopes and inaccurate velocity models: Examples from Brazil. Bull. Seism. Soc. Am., XX, doi: 10.1785/0120180119 PDF

·        Liu J, Li L., Zahradník J, Sokos E, Liu C., Tian X. (2018). North Korea’s 2017 test and its nontectonic aftershock. Geophys. Res. Lett. 45. https://doi.org/10.1002/2018GL077095 PDF Supplement

·        Junqing Liu, Li Li, Jiří Zahradník, Efthimios Sokos, Vladimír Plicka; Generalized Source Model of the North Korea Tests 2009–2017. Seismological Research Letters ; 89 (6): 2166–2173. doi: Liu, J., L. Li, J. Zahradník, E. Sokos, V. Plicka (2018). Generalized Source Model of the North Korea Tests 2009–2017. Seis. Res. Lett. 89(6), 2166–2173. doi: https://doi.org/10.1785/0220180106  PDF Supplement

·        Matos, C., Custódio, S., Batlló, J., Zahradník, J., Arroucau, P., Silveira, G., & Heimann, S. (2018). An active seismic zone in intraplate west Iberia inferred from high-resolution geophysical data. J. Geophys. Res. (Solid Earth), 123, 2885–2907, https://doi.org/10.1002/2017JB015114  PDF

·        Bollini, C., N. Sabbione, V. Plicka, J. Zahradník (2018). Low-parametric modeling of the 2015, Mw 8.3 Illapel, Chile earthquake. Journal of South American Earth Sciences, 88, 144-156. https://doi.org/10.1016/j.jsames.2018.08.006 PDF

·        Ezzelarab, M., M. O. Ebraheem, J. Zahradník (2018). A recent Mw 4.3 earthquake proving activity of a shallow strike-slip fault in the northern part of the Western Desert, Egypt. Journal of African Earth Sciences, 139, 275-282.  PDF

·        Zahradník, J. and E. Sokos (2018). Fitting waveform envelopes to derive focal  mechanisms of moderate earthquakes. Seismol. Res. Lett. 89, 1137-1145. doi:10.1785/0220170161 PDF

·        Zahradník, J., and E. Sokos (2018). ISOLA code for multiple-point source modeling –review. In: “Moment Tensor Solutions - A Useful Tool for Seismotectonics” (S. D'Amico, Ed.), Springer. PDF

·        Turhan, F., M.D. Cambaz, and J. Zahradník (2018). The significance of the crustal velocity model in moment tensor solutions: A case study of Yedisu earthquakes. In: “Moment Tensor Solutions - A Useful Tool for Seismotectonics” (S. D'Amico, Ed.), Springer. PDF



·        Sokos, E., and J. Zahradník (2017). Lesvos June 12, 2017, Mw 6.3 event, a quick study of the source. PDF

·       Vackář, J., J. Burjánek, F. Gallovič, J. Zahradník, and J. Clinton (2017). Bayesian ISOLA: new tool for automated centroid moment tensor inversion. Geophys. J. Int., 210, 693–705. PDF

·       González, O'Leary, V. Clouard, and J. Zahradnik (2017). Moment tensor solutions along the central Lesser Antilles using regional broadband stations. Tectonophysics, 717, 214–225. PDF

·       Zahradník, J.,  H. Čížková, C.R. Bina, E. Sokos, J. Janský, H. Tavera, J. Carvalho (2017). A recent deep earthquake doublet in light of long-term evolution of Nazca subduction. Sci. Rep., 7, 45153; doi: 10.1038/srep45153  PDF Supplement



·        Křížová, D., Zahradník, J., Kiratzi, A. (2016). Possible indicator of a strong isotropic earthquake component: Example of two shallow earthquakes in Greece. Bull. Seism. Soc. Am., 106, 2784-2795. PDF

·        Dias, F., J. Zahradník, and M. Assumpcao (2016). Path-specific, dispersion-based velocity models and moment tensors of moderate events recorded at few distant stations: Examples from Brazil and Greece.  Journal of South American Earth Sciences, 71, 344-358 PDF  Supplement

·        Villegas, R., Zahradnik, J., Nacif, S., Spagnotto, S., Winocur, D., and Leiva, F. (2016). Waveform inversion and focal mechanisms of two weak earthquakes in Cordillera Principal (Argentina) between 35° and 35.5° S, Journal of South American Earth Sciences, 71, 359-369; doi: 10.1016/j.jsames.2015.12.001. PDF

·        Carvalho, J., L.V. Barros, and J. Zahradník (2016). Focal mechanisms and moment magnitudes of micro-earthquakes in central Brazil by waveform inversion with quality assessment and inference of the local stress field. Journal of South American Earth Sciences, 71, 333-343. PDF

·        Triantafyllis,  N., E. Sokos, A. Ilias, and J. Zahradník (2016).  Scisola: Automatic Moment Tensor Solution for SeisComP3. Seismological Research Letters, 87, 157-163; doi:10.1785/0220150065. PDF

·        Sokos, E., J. Zahradník, F. Gallovič, A. Serpetsidaki, V. Plicka, and A. Kiratzi (2016). Asperity break after 12 years: The Mw6.4 2015 Lefkada (Greece) earthquake.  Geophys. Res. Lett., 43, 6137–6145; doi:10.1002/2016GL069427.   PDF   Supplement

·          Fojtíková, L., M. Kristeková, J. Málek, E. Sokos, K. Csicsay, J. Zahradník (2016), Quantifying capability of a local seismic network in terms of locations and focal mechanism solutions of weak earthquakes. J. of Seismology, 20, 93-106; doi 10.1007/s10950-015-9512-1. PDF



·          Zahradník, J., L. Fojtíková, J. Carvalho, L.V. Barros, E. Sokos, J. Janský (2015). Compromising polarity and waveform constraints in focal-mechanism solutions; the Mara Rosa 2010 Mw 4 central Brazil earthquake revisited. Journal of South American Earth Sciences, 63,  323-333. PDF

·          Vackář J., J. Burjánek, and J. Zahradník (2015). Automated detection of disturbances in seismic records; MouseTrap code. Seism. Res. Letters, 86, 442-450. PDF

·          Sokos, E., A. Kiratzi, F. Gallovič, J. Zahradník, A. Serpetsidaki, V. Plicka, J. Janský, J. Kostelecký, G.-A. Tselentis (2015). Rupture process of the 2014 Cephalonia, Greece, earthquake doublet (Mw6) as inferred from regional and local seismic data. Tectonophysics 656, 131-141. PDF and suppl

·          Zahradník, J., J. Janský, V. Plicka (2015). Analysis of the source scanning algorithm with a new P-wave picker. J Seismol  19, 423–441. PDF  and Animations



·          Fojtíková, L., and J. Zahradník (2014). A new strategy for weak events in sparse networks: the first-motion polarity solutions constrained by single-station waveform inversion. Seism. Res. Letters  85, 1265-1274; doi: 10.1785/0220140072. PDF

·          Quintero, R., J. Zahradník, and  E. Sokos (2014). Near-regional CMT and multiple-point source solution of the September 5, 2012, Nicoya, Costa Rica Mw 7.6 (GCMT) earthquake. Journal of South American Earth Sciences 55, 155-165.  PDF

·        Plicka, V., and J. Zahradnik (2014). Inverting full waveforms into 1D seismic velocity model of the upper crust by neighborhood algorithm - Corinth Gulf, Greece. Stud. Geophys. Geod. 58, 388--402, doi: 10.1007/s11200-013-0371-3. PDF

·        Zahradnik, J., and E. Sokos (2014). The Mw 7.1 Van, Eastern Turkey, earthquake 2011 – two-point source modeling by iterative deconvolution and nonnegative least squares. Geoph. J. Int. 196, 522-538. PDF

·        Vackář, J., J. Zahradník, and E. Sokos (2014). Strong fast long-period waves in the Efpalio 2010 earthquake records: explanation in terms of leaking modes. J. of Seismology 18, 81-91. PDF supp1 supp2



·        Gallovič, F., G. Ameri, J. Zahradník, J. Janský, V. Plicka, E. Sokos, A. Askan, and M. Pakzad (2013). Fault Process and Broadband Ground-Motion Simulations of the 23 October 2011 Van (Eastern Turkey) Earthquake. Bull. Seism. Soc. Am. 103, 3164–3178. PDF

·        Křížová, D., J. Zahradník, and A. Kiratzi (2013). Resolvability of isotropic component in regional seismic moment tensor inversion. Bull. Seism. Soc. Am. 103, 2460-2473. PDF

·        Sokos, E. and J. Zahradník (2013). Evaluating centroid moment tensor uncertainty in new version of ISOLA software.  Seismol. Res. Letters  84, 656-665. PDF


2012 and before

·        Zahradník, J. and S. Custódio (2012). Moment tensor resolvability: Application to Southwest Iberia. Bull. Seism. Soc. Am., 102, 1235-1254. PDF

·        Gallovič, F. and J. Zahradník (2012). Complexity of the Mw6.3 2009 L’Aquila (Central Italy) earthquake: 1. Multiple finite-extent source inversion. J. Geophys. Res. 117, B04307. PDF

·        Sokos, E., J. Zahradník, A. Kiratzi, J. Janský, F. Gallovič, O. Novotný, J. Kostelecký, A. Serpetsidaki, and G-A. Tselentis (2012). The January 2010 Efpalio earthquake sequence in the western Corinth Gulf (Greece). Tectonophysics, 530-531, 299-309.  PDF

·        Janský, J.,  O. Novotný, V. Plicka,  J. Zahradník, and E. Sokos (2012). Earthquake location from P-arrival times only: problems and some solutions. Studia Geophysica et Geodaetica 56, 553-566. PDF

·        Zahradník, J., and E. Sokos (2011). Multiple-point source solution of the Mw7.2 Van earthquake, October 23, 2011, Eastern Turkey. Report to EMSC. http://www.emsc-csem.org/Files/event/239856/Van_ISOLA.pdf

·        Zahradnik, J., Gallovic, F.,  Sokos, E., and  Tselentis, G-A (2011). Preliminary slip model of M9 Tohoku earthquake from strong-motion stations in Japan - an extreme application of ISOLA code. Report to EMSC. http://www.emsc-csem.org/Files/event/211414/ISOLA_Report_tohoku.pdf

·        Gallovič, F., Zahradník, J.  (2011). Toward understanding slip-inversion uncertainty and artifacts II: singular value analysis. J. Geophys. Res., 116, B02309.  PDF  and  Supplemental material. PDF

·        Zahradník, J., Gallovič, F. (2010): Toward understanding slip-inversion uncertainty and artifacts. J. Geophys. Res. 115, B09310, 2010. PDF

·        Zahradník, J., Plešinger, A. (2010). Toward understanding subtle instrumentation effects associated with weak seismic events in the near field. Bull. Seism. Soc. Am. 100, 59-73. PDF

·        Serpetsidaki, A., Sokos, E., Tselentis, G.-A., Zahradnik, J. (2010). Seismic sequence near Zakynthos Island, Greece, April 2006: Identification of the activated fault plane. Tectonophysics 480, 23-32. PDF

·        Gallovič, F., Zahradník, J., Křížová, D., Plicka, V., Sokos, E., Serpetsidaki, A., Tselentis, G-A. (2009). From Earthquake Centroid to Spatial-Temporal Rupture Evolution: Mw 6.3 Movri Mountain earthquake, June 8, 2008, Greece. Geoph. Res. Lett. 36, L21310. PDF;  Appendix PDF

·        Janský, J,, Zahradník, J., Plicka, V. (2009).  Efficiency of individual CRL stations in seismic monitoring of the Western Gulf of Corinth. Acta Geodyn. Geomater., 6, 1-8, 2009. PDF

·        Janský, J., Zahradník, J., Plicka, V. (2009). Shallow earthquakes: shallower than expected? Stud. Geophys. Geod., 53 (2009), 261-268 (a non-reviewed article). PDF

·        Adamová, P., Sokos E., Zahradník, J. (2009). Problematic non-double-couple mechanism of the Amfilochia Mw5 earthquake, Western Greece, J. Seismology., 13, 1-12. PDF

·        Zahradník, J., Gallovič, F., Sokos,  E., Serpetsidaki, A.,  Tselentis, G-A. (2008). Quick fault-plane identification by a geometrical method: application to the Mw6.2 Leonidio earthquake, January 6, 2008, Greece. Seismol. Res. Letters 79, 653-662. PDF

·        Zahradník, J., Sokos, E., Tselentis, G.-A., Martakis, N. (2008). Non-double-couple mechanism of moderate earthquakes near Zakynthos, April 2006, explanation in terms of complexity, Geophys. Prosp.  56, 341-356. PDF

·        Zahradník J., Janský J., Plicka V. (2008). Detailed waveform inversion for moment tensors of M~4 events; examples from the Corinth Gulf, Greece, Bull. Seism. Soc. Am., 98, 2756-2771. PDF

·        Sokos, E. Zahradník, J., (2008). ISOLA a Fortran code and a Matlab GUI to perform multiple-point source inversion of seismic data, Computers and Geosciences, 34, 967-977. PDF

·        Burjánek, J., Zahradník, J. (2007). Dynamic stress field of a kinematic earthquake source model with k-squared slip distribution, Geophys. J. Int. 171, 1082-1097. PDF

·        Bernard P., Lyon-Caen H., Briole P., Deschamps A., Boudin F., Makropoulos K., Papadimitriou P., Lemeille F., Patau L., Billiris J., Paradissis D., Papazissi K., Castarède H., Charade O., Nercessian A., Avallone A., Pacchiani F., Zahradnik J., Sacks S., Linde A. (2006). Seismicity, deformation and seismic hazard in the western rift of Corinth: New insights from the Corinth Rift Laboratory (CRL). Tectonophysics, 426, 7-30. PDF

·        Zahradník, J., Plešinger, A., (2005). Long-period pulses in broadband records of near earthquakes Bul. Seism. Soc. Am., Vol. 95, No. 5, 1928-1939. PDF

·        Zahradník, J., Serpetsidaki, A., Sokos, E., Tselentis, G-A., (2005). Iterative deconvolution of regional waveforms and a double-event interpretation of the 2003 Lefkada earthquake, Greece. Bull. Seism. Soc. Am., Vol. 95, No. 1, 159-172. PDF



Visits abroad:

·        Long: Soviet Union 1976, Peru 1982, Canada  1984, 1989, 1991

·        Short: Sweden, Costa Rica, Colombia, Brazil, Greece, Cuba



·        Member of the Scientific Council of the Geophys. Inst. Acad. Sci. Czech Rep. (1993-2001)

·        Member of the Institution Council of the Geophys. Inst. Acad. Sci. Czech Rep. (2008-2016)

·        Member of the Evaluation panel P210 of the Grant Agency of the Czech Rep. (2009-2013)

·        Member of the Scientific Council of the Faculty of Mathematics and Physics (2005-2012)

·        Remote referee of the European Research Council (2007-2010)

·        Vice-President of the European Seismological Commission (2004-2006)

·        Associate Editor of the Journal of Seismology, Springer  (2002-2017)


Teaching in Prague:

·        In Prague 1970-2002: Introduction to geophysics. Internal constitution of the Earth. Numerical methods in geophysics. Seismology. Physics of the seismic source. Numerical prediction of earthquake ground motions. Physics of the Earth (for the Faculty of Science). Seismic seminar.

·        In Prague 2002-present: Seismology I and II, Seismic seminar


Teaching abroad:

·        Intensive course in Costa Rica on waveform inversion for 15 participants from Central and South America, (Sep. 3-9, 2011)  

·        Intensive course in Bogota – training in ISOLA software - for 16 students from Colombia (Sep 3 - Oct 4, 2013)

·        International training course in full waveform inversion for moment tensors and multiple source models (ISOLA code)’ for 21 participants from 7 countries of Latin America, Dec 2 to 11, 2013 – Brasília/Brazil

·        International training course  Teoría y práctica de inversión de ondas sísmicas para calcular el tensor de  momento, utilizando una versión actualizada de ISOLA’,  for 26 participants from 12 countries of Latin America, 13.-18.6.2016, Costa Rica



Research interests:

Numerical methods in seismic wave propagation (the finite-difference method). Seismic site effects, international blind prediction experiments. Seismic source parameter retrieval. Modeling finite-extent seismic sources. Strong-ground motion simulation. Operation of seismic stations and data analysis.

Research projects:

  • 1995-1998 NATO, GR-COAL project (leader of the Prague team)
  • 1997-1999 Inco-Copernicus ISMOD project (leader of the Prague team)
  • 2000-2003 EC project PRESAP (responsible for a work package and leader of the Prague team)
  • 2005-2006 EC project 3HAZ-CORINTH (leader of the Prague team)
  • 2003-2005 EC FP6 project MAGMA, Prague Centre of Mathematical Geophysics, Meteorology, and their Applications, (project coordinator)
  • A number of national projects of various grant agencies: GACR, GAUK, MSMT
  • 1997-present building seismic stations of the Charles University in Greece (in co-operation with the University of Patras)