G-Cubed
Supporting Information for
Characterization and Petrological Constraints of the MidLithospheric Discontinuity
Erika Rader1, Nicholas Schmerr2, Erica Emry3, Daniel Frost4, Cheng Cheng5, Julie
Menard1, Chun-Quan Yu6, Dennis Geist7
1*
Academy of Natural Sciences of Drexel University, 1900 Benjamin Franklin Parkway
Philadelphia, PA 19103
2
Department of Geology, University of Maryland, College Park, MD, 20742-4211
3
Department of Geosciences, Penn State University, 407 Deike Building, University Park, PA
16802
4
School of Earth and Environment, Univ. of Leeds, Maths/Earth and Environment Building
Leeds. LS2 9JT, United Kingdom
5
Department of Earth and Planetary Science, Univ. of California Berkeley, 307 McCone Hall,
Berkeley, CA 94720-4767
6
Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of
Technology, 77 Mass. Ave., Cambridge, MA 02139
7
Department of Geological Sciences, University of Idaho, 875 Perimeter Dr. Moscow ID, 83844
*
Corresponding author email: Erika.rader@drexel.edu
Contents of this file
Figures S1-S8
Introduction
These figures are further breakdowns of regional data.
1
Figure S1. Same as Figure 3 (main text), with boxes around A) North America, B) South
America, C) Eurasia, D) South Africa, and E) Australia. Boxes correspond to the
histograms below. MLD observations and references are cataloged in Table 1. Cratonic
bodies are indicated in gray. The symbol for each observation indicates the method used
and the color indicates the depth at which the MLD was identified. Boxes with broken
boundaries are surface waves or regions of multiple receiver functions, individual squares
are the midpoints locale of ScS reverberation corridors, triangles are individual receiver
function stacks, hexagons are anisotropic studies, diamonds are SS precursors, and solid
lines are active source studies.
2
Figure S2. Histogram showing the 2° x 2° block mean for North America, corresponding
to box A in Figure S1. Thick black line indicates the mean, and thin gray lines indicate 1
standard deviation of the distribution.
Figure S3. Histogram showing the 2° x 2° block mean for South America, corresponding
to box B in Figure S1. Thick black line indicates the mean, and thin gray lines indicate 1
standard deviation of the distribution.
3
Figure S4. Histogram showing the 2° x 2° block mean for Eurasia, corresponding to box
C in Figure S1. Thick black line indicates the mean, and thin gray lines indicate 1
standard deviation of the distribution.
Figure S5. Histogram showing the 2° x 2° block mean for South Africa, corresponding to
box D in Figure S1. Thick black line indicates the mean, and thin gray lines indicate 1
standard deviation of the distribution.
4
Figure S6. Histogram showing the 2° x 2° block mean for Australia, corresponding to
box E in Figure S1. Thick black line indicates the mean, and thin gray lines indicate 1
standard deviation of the distribution.
5
Figure S7. Same as Figure 3 and S1 (main text), but including only higher frequency (>4
sec for SRFs and >1 sec for PRFs) receiver functions following suggestions from Lekic
and Fischer (2013), Hopper et al (2014), and Wirth and Long (2014) that MLD depths
obtained from longer period studies may be biased by interference with other adjacent
discontinuities.
6
Figure S8. Same as in Figure 4 (main text), but corresponding to the higher frequency
receiver function studies shown above (Figure S7). Result shows larger standard
deviation than the histogram with all studies included, suggesting that the MLD may
actually exhibit more variation in depth.
7