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Auxiliary material for this article contains six figures and two animations.

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FilenameFormatSizeDescription
grl28683-sup-0001-readme.txtplain text document4Kreadme.txt
grl28683-sup-0002-fs01.epsPS document1597KFigure S1. Locations of 661 seismometers in North America that returned broadband data from the IRIS DMC for the Tohoku mainshock, the CC spectrum, and the aligned traces.
grl28683-sup-0003-fs02.epsPS document1033KFigure S2. Equivalent analysis for the most similar 378 of the P wave traces recorded in North America.
grl28683-sup-0004-fs03.epsPS document826KFigure S3. Comparison of back-projection results for the dense array configuration of Figure S2 and the sparse array configuration of Figure 1.
grl28683-sup-0005-fs04.epsPS document495KFigure S4. Second comparison of dense and sparse array configurations, this time in two broader pass-bands, that leads to more robust images.
grl28683-sup-0006-fs05.epsPS document388KFigure S5. Array response functions for the sparse and dense configurations of North American seismometers, calculated for a period of 2 s.
grl28683-sup-0007-fs06.epsPS document638KFigure S6. Array response functions for the sparse geometry of North American seismometers shown in Figure 1.
grl28683-sup-0008-ms01.movQuickTime video4834KAnimation S1. Full comparison of back-projections carried out in five narrow described in the text.
grl28683-sup-0009-ms02.movQuickTime video2575KAnimation S2. Full comparison of back-projections carried out in the two broader pass-bands described in the text.

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