Auxiliary material for this article contains video clips of two Santiaguito eruptions showing the coincident onset of explosive ash emissions and dome uplift.

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grl27537-sup-0001-readme.txtplain text document1Kreadme.txt
grl27537-sup-0002-ms01.mp4MPEG-4 video5152KAnimation 1. Video clip for eruption occurring on January 2 at 14:16 GMT.
grl27537-sup-0003-ms02.mp4MPEG-4 video4480KAnimation 2. Video clip for eruption occurring on January 2 at 13:54 GMT.

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