Last modified by Hrvoje Tkalcic on 1 February, 2017.

This is a list of electronic supplements to "The Earth's Inner Core Revealed by Observational Seismology" (ISBN 9781107037304) by Hrvoje Tkalcic, published by Cambridge University Press (2017). 

(1) PKPbc-PKIKP differential travel time datasets
Full description and references for this dataset are provided in the header of the ascii file. Subsets of this dataset or the entire dataset were used to produce Figures 2.7a, 4.1, 4.2, 4.7, 4.8, 4.11, 4.12, 4.19, 4.22, 5.4, 6.2, 6.3, 6.4 in the book. The data presented here is freely available for your research. Please consider contributing to future versions of this dataset by contacting the author.

(2) PKPab-PKIKP differential travel time dataset
Full description and references for this dataset are provided in the header of the ascii file. Subsets of this dataset or the entire dataset were used to produce Figures 2.7a, 4.1, 4.2, 4.7, 4.8, 4.11, 4.12, 4.19, 4.22, 5.4, 6.2, 6.3, 6.4 in the book. The data presented here is freely available for your research. Please consider contributing to future versions of this dataset by contacting the author.

(3) Animation: inner core sampling by PKIKP rays
Global sampling of the Earth's inner core by PKIKP waves. Green dots are the locations of seismic recorders, red dots are the locations of the earthquakes used in the analysis of PKIKP data. The red sphere in the planet's centre is the inner core. Ray paths of PKIKP waves are presented by thin lines connecting the earthquake sources and receivers. Blue lines are fast, and red lines are slow ray-paths (with respect to a prediction from a spherically symmetric Earth model). Uneven distribution of large earthquakes and seismic stations installed worldwide limits this sampling. More installations (including ocean bottoms and remote areas) are needed to help advance our understanding of the deep Earth. The dataset used in this animation is provided in the ascii file under (1) and used in: Tkalcic, H., Complex inner core of the Earth: The last frontier of global seismology, Reviews of Geophysics, 53/1, 59-94, doi:10.1002/2014RG000469, 2015. Additional data used in this animation were measured on Hi-net recordings and were published in: Yee, T.-G., J. Rhie and H. Tkalcic, Regionally heterogeneous uppermost inner core observed with Hi-net array, J. Geophys. Res., 119, 7823-7845, doi:10.10002/2014JB011341, 2014. Animation credit: Drew Whitehouse, National Computational Infrastructure.

(4) Animation: inner core sampling by PKIKP rays +PKPbc
Same as (3) with an addition of corresponding PKPbc rays paths and the outer core (green sphere). PKPbc rays (shown by neutral white paths) traverse the outer core but do not enter the inner core. The dataset used in this animation is provided in the ascii file under (1) and used in: Tkalcic, H., Complex inner core of the Earth: The last frontier of global seismology, Reviews of Geophysics, 53/1, 59-94, doi:10.1002/2014RG000469, 2015. Additional data used in this animation were measured on Hi-net recordings and were published in: Yee, T.-G., J. Rhie and H. Tkalcic, Regionally heterogeneous uppermost inner core observed with Hi-net array, J. Geophys. Res., 119, 7823-7845, doi:10.10002/2014JB011341, 2014. Animation credit: Drew Whitehouse, National Computational Infrastructure.

(5) Animation: equatorial versus polar sampling of the inner core
This emphasises the difference between the polar and the equatorial datasets of PKIKP. The yellow-orange globe in the centre is the inner core, and the map of the Earth’s surface is projected onto the inner core for orientation purposes. The dataset used in this animation is provided in the ascii file under (1) and used in: Tkalcic, H., Complex inner core of the Earth: The last frontier of global seismology, Reviews of Geophysics, 53/1, 59-94, doi:10.1002/2014RG000469, 2015. The colours of the ray paths correspond to different values of travel time residuals: blue marks fast, white marks neutral, and red marks slow paths through the IC. Orange and yellow colours represent quasi-western and quasi-eastern hemispheres of the inner core, as defined by Tanaka and Hamaguchi (1997). (left) Quasi-polar PKIKP ray paths, defined by angle ξ ≤ 35 degrees and (right) quasi-equatorial PKIKP ray path, defined by angle ξ ≥ 35 degrees. The snapshots of this animation were used to create Figures 6.2 and 6.3 in the book. Animation credit: Rhys Hawkins, ANU Vizlab.

(6) Image: inner core coverage by regions
3D illustration of PKIKP ray paths traversing the IC from a view point outside the Earth in the equatorial plane. The red globe in the centre of each
image is the inner core. The dataset used in this animation is provided in the ascii file under (1) and used in: Tkalcic, H., Complex inner core of the Earth: The last frontier of global seismology, Reviews of Geophysics, 53/1, 59-94, doi:10.1002/2014RG000469, 2015. Colours of ray paths correspond to different values of travel time residuals: blue marks fast, white marks neutral, and red marks slow paths through the inner core. Green balls are station locations and red balls are event locations. The view is centred on (a) Indian Ocean, (b) southeast Asia, (c) Pacific Ocean and (d) Atlantic Ocean. This is an updated image used on the cover page (and Figure 6.4) of the book. Animation (3) was used to create these snapshots. Animation credit: Drew Whitehouse, National Computational Infrastructure.

(7) Image: inner core rotation detection by doublets
Illustration of the rotational dynamics of the inner core. Marked are the South Sandwich Islands archipelago (the location of earthquake doublets) (yellow ball) and the COLA seismological station near Fairbanks, Alaska (green ball). The inner core is shown at the Earth’s centre. The PKIKP ray paths for an earthquake doublet are shown in blue and red. They traverse the western hemisphere of the Earth’s inner core (for a definition of hemispheres, see Section 3.8.1 in the book) through a well-studied portion featuring a linear gradient in isotropic velocity, which is shown by a small patch of varying colour. As the inner core rotates eastwardly with respect to the mantle (indicated by the yellow arrow), a fixed source-receiver path will sample the same mantle and outer core (not shown) structure, but slightly different inner core structure due to the velocity gradient. This is another version of Figure 5.3 in the book. Visualisation credit: Rhys Hawkins, ANU Vizlab.