Auxiliary material for this article contains a description of the moment tensor solution for the Mw4.1 event that occurred at the beginning of the swarm sequence as well as some background information of how the moment tensor was computed.

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grl27393-sup-0001-readme.txtplain text document4Kreadme.txt
grl27393-sup-0002-txts01.pdfPDF document101KText S1. Results of F test statistics for five different source models and moment tensor solutions for best fitting source models (Table S1) and percentage of volumetric component, change in source volume, fault area, and opening dislocation (Table S2).
grl27393-sup-0003-fs01.pdfPDF document15243KFigure S1. Yellowstone earthquakes for 1973–2009.
grl27393-sup-0004-fs02.pdfPDF document1281KFigure S2. P-wave first-motion focal mechanisms determined for well recorded swarm earthquakes.
grl27393-sup-0005-fs03.pdfPDF document13804KFigure S3. Modeled crustal temperature and the brittle-ductile transition relative to the swarm hypocenters.

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