Dr Babak Hejrani

Postdoctoral Fellow
Jeger 8, 142 Mills Road, Acton, ACT, 2601, Australia

Profile

Qualifications

PhD

Biography

Professional Positions:

  • October 2014 - Present PostDoc fellow, Research School of Earth Sciences, Australian National University
  • Feb. 2014 - Apr. 2014 PostDoc fellow, Department of Geoscience, Aarhus University

Educations: 

  • Feb. 2011 - Jan 2014 PhD student, Department of Geoscience, Aarhus University
  • Sep. 2007 - Sep. 2010 Master student, Institute of Geophysics, University of Tehran
  • Sep. 2002 - Sep. 2006 Bachelor student, Department of Science, University of Kurdistan

Place of Birth, Languages

  • Kurdistan 
  • Kurdish, English, Farsi

Research

Research interests

Earthquake source parameter estimation:

My main research interest, currently, lies in rapid (near real-time) estimation of earthquake source parameters, such as moment tensor components, Centriod depth and location (CMT solution). In the presence of reasonable resolution of CMT solution and hypocenter location, the question of estimating the fault plane (strike, dip and rake of the fault plane) is of great interest. The result of moment tensor inversion highly depends on the accuracy of the velocity structure between the source and the receiver. Here, my goal is to use 3D velocity structure of Australia and surrounding regions to calculate the CMT in a semi-automated procedure. 

If the velocity structure is well-known, then addressing complexity in earthquake source can be more reliable. Complexity in tectonic earthquakes is an exciting, still young and not well addressed issue. In complex tectonic regions, where different tectonic regimes meet, occurrence of close lying events (one may trigger another) with few seconds delay, provides great opportunity to study the nature of complex earthquakes with tectonic origin. Here, more advanced non-linear inversion methods, such as Bayesian inference is of great interest.

Publications

Journals:

Hejrani, B., Balling, N., Jacobsen, B.H., England. R. (2016), Upper-mantle velocities below the Scandinavian Mountains from P- and S-wave traveltime tomography, Geophysical Journal International, http://gji.oxfordjournals.org/content/early/2016/09/30/gji.ggw370

Mousavi, S., K. Bauer, M. Korn., B. Hejrani (2015), Seismic tomography reveals a mid-crustal intrusive body, fluid pathways and their relation to the earthquake swarms in West Bohemia/Vogtland, Geophysical Journal International, http://gji.oxfordjournals.org/content/203/2/1113.full.

Hejrani, B., N. Balling., B.H. Jacobsen., F. Tillmann (2015), Upper-mantle P- and S-wave velocities across the Northern Tornquist Zone from traveltime tomography, Geophysical Journal International , 203 (1): 437 – 458. http://gji.oxfordjournals.org/content/203/1/437.full

Hejrani, B., B.H. Jacobsen, and N. Balling (2014), Teleseismic tomography when stations follow profiles: pitfalls and remedies, Seismological Research Letters, 85, 997-1003. http://srl.geoscienceworld.org/content/85/5/997.extract

Conferences:

Hejrani, B., H. Tkalcic and A. Fichtner (2015), Centroid Moment Tensor Inversion in a 3D heterogeneous Earth: Application to the Australasian region, AGU Fall Meeting 2015, San Francisco, United States.  http://adsabs.harvard.edu/abs/2015AGUFM.S23C2729H

Hejrani, B., B.H. Jacobsen, N. Balling, R. Kind, F. Tilmann, R. England and S.B. Nielsen (2014), P-wave and S-wave traveltime residuals in Caledonian and adjacent units of Northern Europe and Greenland, Geophysical Research Abstracts, EGU2014-10014, Vienna, Austria. http://meetingorganizer.copernicus.org/EGU2014/EGU2014-10014.pdf

Schiffer, C., N. Balling, B.H. Jacobsen, B. Hejrani., S.B. Nielsen (2013), Upper mantle and crustal structure of the East Greenland Caledonides: New geophysical evidence and geodynamic implications, Abstract from 2013 AGU fall meeting, San Francisco, United states. http://adsabs.harvard.edu/abs/2013AGUFM.T11E..06S

Hejrani, B., B.H. Jacobsen, N. Balling, F. Tilmann, R. Kind. (2013), Upper-mantle velocity structure beneath Jutland, Denmark and northern Germany: Preliminary results, IASPEI meeting, Abstract from Knowledge for the future, Guthenburg, Sweden. http://www.forskningsdatabasen.dk/catalog/2185909654

Hejrani, B., B.H. Jacobsen, N. Balling and R. England (2012), A seismic tomography study of lithospheric structure under the Norwegian Caledonides, Geophysical Research Abstracts, EGU2012-4334. Vienna, Austria. http://meetingorganizer.copernicus.org/EGU2012/EGU2012-4334.pdf

Hejrani, B., B.H. Jacobsen, A.B. Medhus and N. Balling (2011), Resolving a deep lithosphere transition between Southern Norway and Southern Sweden, Geophysical Research Abstracts, EGU2011-3144. http://meetingorganizer.copernicus.org/EGU2011/EGU2011-3144.pdf

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