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A/Prof Hrvoje Tkalčić 


Senior Fellow, Seismology and Mathematical Geophysics/Earth Physics

Research School of Earth Sciences,
The Australian National University
 

Canberra, ACT 0200, AUSTRALIA

tel: +61-2-6125 3213
fax: +61-2-6257 2737

Email: Hrvoje.Tkalcic @ anu.edu.au




With PhD students and postdocs in front of RSES, April 2014. From left: Nita Sebastian - PhD student, Tanja Pejić - PhD student, Marija Mustać - PhD candidate, Joanne Stephenson - PhD student. From right: Surya Pachhai - PhD candidate, Josip Stipčević - Postdoctoral Fellow, Jack Muir - Honours Thesis student, Christian Sippl - Postdoctoral Fellow. Photo taken April, 2014 by Ted Lilley


Current PhD students

Surya Pachhai
Marija Mustać
Tanja Pejić
Nita Sebastian
Joanne Stephenson

Former PhD students

Mallory Young

Current Postdocs

Josip Stipčević
Christian Sippl
Babak Hejrani
Seongryong Kim

Recent collaborators

Andreas Fichtner
Anya Reading
Brian Kennett
Fabrice Fontaine
Gordon Lister
Junkee Rhie
Kate Kiseeva
Malcolm Sambridge
Marijan Herak
Maurizio Mattesini
Nicholas Rawlinson
Thomas Bodin
Satoru Tanaka
Vernon Cormier



Current Grants

2014-2016 ARC Discovery Grant ($$) "Rapid determination of earthquake sources in Australia" (Tkalčić, H. and A. Fichtner);
2013-2015 ARC Linkage Grant ($$$$) "Craton modification and growth: The east Albany-Fraser Orogen in 3-D" (Tkalčić, H., B.L.N. Kennett, C. Spaggiari, K. Gessner);
2013-2015 ARC Discovery Grant ($$$) "Multi-array, multi-frequency probing of the Earth's heterogeneity" (Tkalčić, B.L.N. Kennett, S. Tanaka);
2013-2016 USA DoD/AFRL Grant ($$$$) "Improved Earth structure in Northeast Asia and seismic moment tensor inversion using Bayesian partition modeling" (Tkalčić, Y. Chen, J. Rhie, S. Ford)





Publications

Curriculum Vitae

News and media


Opportunities for students


PHYS3070 Course material


Research Interests

The Australian Outback through my lens

A look inside a volcano: Le Piton de la Fournaise, La Reunion Island


Free Software

IRFFM (Interactive Receiver Functions Forward Modeller) v1.1




RESEARCH HIGHLIGHTS

SHUFFLING ROTATION OF THE EARTH'S INNER CORE

Click on the image above to find out more about rotational dynamics of the inner core.

CANDY WRAPPER FOR THE EARTH'S INNER CORE

Click on the candy to find out more about the reconciliation of mineral physics predictions and seismological observations of inner core structure.

INNER CORE SAMPLING BY PKP WAVES VIDEO

Click on the image above to see an animation of our current spatial coverage of the inner core by PKP waves. Uneven distribution of large earthquakes and seismic stations installed worldwide limits this sampling. More installations are needed to help advance our understanding of the deep Earth. The PKP dataset and tomographic model are from Tkalčić et al., GJI 2002, Leykam et al., GJI 2010, and Tkalčić, GRL 2010. Green dots are station-, while red dots are earthquake-locations. The yellow sphere is the Earth's inner core, seen through the compressional velocity field observed for the lowermost mantle. Blue lines are fast, and red lines are slow ray-paths through the Earth. This animation is made in collaboration with NCI's Rhys Hawkins. Source: "The Earth's inner core - exposed by observational seismology", H. Tkalčić, in preparation


Watch another video of inner core sampling (without lowermost mantle structure) on youtube

INNER CORE AS A CONGLOMERATE OF ANISOTROPIC DOMAINS

Click on the image above to find out more about recent research on the inner core.

BENFORD'S LAW IN GEOSCIENCES

More about this topic under News and media.
For more information, see research pages of Malcolm Sambridge.

VOLCANIC EARTHQUAKES IN ICELAND WITH ANOMALOUS SEISMIC RADIATION

Click on the image above to find out more about recent research on anomalous earthquakes in Iceland.

SMALL-SCALE HETEROGENEITY OR PARTIAL MELT IN THE UPPER MANTLE POSTULATED FROM FIRST OBSERVATIONS AND MODELING OF "PODAL" PKPPKP WAVES AND THEIR PRECURSORS
Click on the MPEG icon to watch a movie showing PKPPKP main phase at lower frequencies, and prominent PKPPKP precursors at higher frequencies, for an Alaskan earthquake observed at the ILAR array. These precursors are interpreted as reflections from the upper mantle heterogeneity between 150 and 220 km depth.


Click on the image above to find out more about the first observations of "podal" PKPPKP waves and their precursors.


LARGE POLARIZATION ANISOTROPY IN THE MANTLE OBSERVED THROUGH MULTI-STEP MODELING OF RECEIVER FUNCTIONS AND SURFACE WAVES

Click on the image above to find out more about multi-step modeling of receiver functions and surface wave dispersion, and the observation of large polarization anisotropy in the upper mantle.


COMPRESSIONAL VELOCITY MODEL OF THE LOWERMOST MANTLE

Click on the image above for more details on P wave tomography of the Earth's lowermost mantle using PKP and PcP waves and implications for anisotropy in the inner core. You are welcome to download TRH_KC model with plotting instructions and figures.


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