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Research School of Earth Sciences - Hrvoje Tkalčić - HOME PAGE

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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 on the ANU campus, May 2013. From left: Surya Pachhai, Tanja Pejić, Mallory Young and Marija Mustać.


Current PhD students

Mallory Young
Surya Pachhai
Marija Mustać
Tanja Pejić

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




THE SHUFFLING ROTATION OF THE EARTH'S INNER CORE

The image above illustrates the ray-paths of elastic waves of an earthquake doublet from the South Sandwich Islands region travelling through the Earth's inner core to station COLA in Alaska. 7 new doublets and 17 old doublets were analysed to reconstruct the history of inner core rotation with respect to the mantle. This led to the discovery that the rotation rate of the inner core with respect to the mantle is variable in time. A transdimensional Bayesian inversion was used to interpret the travel time data. Image credit: Rhys Hawkins, National Computational Infrastructure


Article:
by H. Tkalčić, M.K. Young, T. Bodin, S. Ngo & M. Sambridge

The shuffling rotation of the Earth's inner core revealed by earthquake doublets

Nature Geoscience, DOI:10.1038/NGEO1813, 2013.


News selection:
ANU Press Release Canberra Times ABC News Our Amazing Planet Yahoo News NBC News Phys.org Discovery Sydney Herald
Tendencias Milenio Emol Xinhua Sterne-und-Weltraum.de Metronieuws.nl
Youtube Mk.ru Gaianews.it Journal-dela-science.fr Journal-de-noticias.pr


ABC Science "StarStuff" talk show with Stuart Gary

"Science News" on Croatian National Television HTV1

"On Science" talk show on Croatian National Radio HR1

Thomas Bodin's interview for German Public Radio/SWR


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

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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