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Research School of Earth Sciences - Hrvoje Tkalčić - HOME PAGE

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Associate 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 (June, 2018). Standing from the left: Xueyi Shang (visiting PhD student), Thanh-Son Pham - PhD candidate, Nita Sebastian - PhD candidate, Sima Mousavi - Postdoctoral Fellow, Jo Stephenson - PhD candidate, Babak Hejrani - Postdoctoral Fellow; lower row: Thuany Patricia Costa de Lima - PhD student, Sheng Wang - PhD student, Lauren Waszek - DECRA Fellow; missing: Anya Makushkina - PhD candidate, Angelina Egorova - MSc student;
Photo credit: Benoit Tauzin




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 PhD students

Sheng Wang
Thuany Costa de Lima
Anya Makushkina
Thanh-Son Pham
Nita Sebastian
Joanne Stephenson

Former PhD students

Tanja Pejić
Marija Mustać
Surya Pachhai
Mallory Young

Current Postdocs

Babak Hejrani

Former Postdocs

Marija Mustać
Seongryong Kim
Christian Sippl
Josip Stipčević

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! 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

2019-2021 Marine National Facility Grant ($$$$) "Macquarie Ridge in 3D" (Tkalčić,H., C. Eakin, M. Coffin, N. Rawlinson, J. Stock );
2014-2016 ARC Discovery Grant ($$) "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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