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Professor Hrvoje Tkalčić 


Head of Seismology and Mathematical Geophysics

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

ORCID iD iconorcid.org/0000-0001-7072-490X


I use seismology and mathematical geophysics tools to understand the internal workings of our planet. You can think of these tools together as of an internal telescope through which we image Earth's structure and dynamics.



With students and researchers at RSES (December, 2018). From left to right: Dr Lauren Waszek, Jo Stephenson - PhD candidate, Xueyi Shang (visiting PhD student), Sheng Wang - PhD student, Thanh-Son Pham - PhD candidate, Dr Sima Mousavi, Dr Babak Hejrani, Anya Makushkina - PhD candidate, Angelina Egorova - MSc student, Thuany Patricia Costa de Lima - PhD student, Dr Benoit Tauzin, Nita Sebastian - PhD student.




Link to electronic supplements to the book



Link to Cambridge University Press site



Review in The Leading Edge by J. Brittan



Review in Contemporary Physics by M. Vogel



Link to books sale on Amazon



Link to books sale on Booktopia


Current and recent grants

2020-2022 ARC Discovery Grant DP200101854 ($$$$) "Probing the Australian-Pacific plate boundary: Macquarie Ridge in 3D" (Tkalčić, C. Eakin, M. Coffin, N. Rawlinson, J. Stock);
2020-2021 ARC LIEF Grant LE200100086 ($$$) "Rapid Deployment Seismic Recorders for Interdisciplinary Antarctic Research" (Reading, A., S. King, H. Tkalčić, B. Kulessa);
2020-2022 USA DoE/AFRL Grant ($$$) "Towards improved understanding of seismic moment tensors: Utilizing high-resolution Earth model with accompanying uncertainty within hierarchical Bayesian inversion framework" (Tkalčić, H., S. Kim);
2020-2021 Marine National Facility Grant ($$$$) "Macquarie Ridge in 3D: Recovery" (Tkalčić, H., C. Eakin, M. Coffin, N. Rawlinson, J. Stock);
2019-2020 Marine National Facility Grant ($$$$) "Macquarie Ridge in 3D: Deployment" (Tkalčić, H., C. Eakin, M. Coffin, N. Rawlinson, J. Stock);
2014-2017 ARC Discovery Grant DP140102533 ($$) "Rapid determination of earthquake sources in Australia" (Tkalčić, H., A. Fichtner);
2013-2016 ARC Linkage Grant LP130100413 ($$$$) "Craton modification and growth: The east Albany-Fraser Orogen in 3-D" (Tkalčić, H., Kennett, C. Spaggiari, K. Gessner);
2013-2015 ARC Discovery Grant DP130101473 ($$$) "Multi-array, multi-frequency probing of the Earth's heterogeneity" (Tkalčić, H., Kennett, S. Tanaka);
2013-2016 USA DoD/AFRL Grant ($$$$) "Improved Earth structure in Northeast Asia and seismic moment tensor$ partition modeling" (Tkalčić, Y. Chen, J. Rhie, S. Ford)

Current PhD students

Sheng Wang
Thuany Costa de Lima
Anya Makushkina
Nita Sebastian
Joanne Stephenson

Former PhD students

Thanh-Son Pham
Tanja Pejić
Marija Mustać
Surya Pachhai
Mallory Young

Current Postdocs

Thanh-Son Pham
Xiaolong Ma

Former Postdocs

Babak Hejrani (now at Geoscience Australia)
Marija Mustać (now at University of Zagreb)
Seongryong Kim (now at Chungnam University)
Christian Sippl (now at Czech Academy of Sciences)
Josip Stipčević (now at University of Zagreb)

Recent collaborators

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

NEW! A DETECTION OF J (SHEAR) WAVES IN THE EARTH'S INNER CORE



The image above illustrates the principle of J waves detection. Image credit: Thanh-Son Phạm and Hrvoje Tkalčić


Free Access to Article on the Publications page(with a permission from AAAS/Science)

News selection:
ANU Press Release
ANU TV
ABC News


STRONG, MULTI-SCALE HETEROGENEITY IN EARTH'S LOWERMOST MANTLE

Click on the image above to find out more about heterogeneity in the lowermost mantle.



Current and recent grants

2020-2022 ARC Discovery Grant ($$$$) "Probing the Australian-Pacific plate boundary: Macquarie Ridge in 3-D" (Tkalčić, C. Eakin, M. Coffin, N. Rawlinson, J. Stock);
2020-2021 USA DoE/AFRL Grant ($$$) "Towards improved understanding of seismic moment tensors: Utilizing high-resolution Earth model with accompanying uncertainty within hierarchical Bayesian inversion framework" (Tkalčić, S. Kim)

2020-2021 Marine National Facility Grant ($$$$) "Macquarie Ridge in 3D: Recovery" (Tkalčić,H., C. Eakin, M. Coffin, N. Rawlinson, J. Stock );
2019-2020 Marine National Facility Grant ($$$$) "Macquarie Ridge in 3D: Deployment" (Tkalčić,H., C. Eakin, M. Coffin, N. Rawlinson, J. Stock );

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)






Free Software

IRFFM 2 - Interactive Receiver Functions Forward Modeller 2 v1.2
(JOINT INVERSION OF RECEIVER FUNCTIONS AND SURFACE WAVE DISPERSION)




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: revealed 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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