Auxiliary material for this article contains a text document, four figures that give additional information on tremor spectrograms, amplitude spectrum, particle motion, correlation of the last 2006 aseismic slow slip event in Mexico, and NVT activity, and two figures that show NVT errors distributions on the profile parallel to the trench strike and on the regional map.

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grl24257-sup-0001-readme.txtplain text document5Kreadme.txt
grl24257-sup-0002-txts01.txtplain text document2KText S1. A short description of NVT errors estimates.
grl24257-sup-0003-fs01.jpgimage/pjpeg588KFigure S1. NVT can be easily identified in daily spectrograms from PLIG and CAIG.
grl24257-sup-0004-fs02.jpgimage/pjpeg592KFigure S2. Spectrogram of the BUCU broadband record on 1 January 2006 and spectral amplitudes corresponding to the noise and NVT.
grl24257-sup-0005-fs03a.jpgimage/pjpeg286KFigure S3a. Particle motion plots in the horizontal and vertical planes for the 30 January 2006 12:00 NVT burst at the ACAH, SATA, BUCU, and AMAC stations.
grl24257-sup-0006-fs03b.jpgimage/pjpeg764KFigure S3b. Records of 100 Hz sampling rate at several MASE stations on 30 January 2006.
grl24257-sup-0007-fs04.jpgimage/pjpeg472KFigure S4. NVT activity curves.
grl24257-sup-0008-fs05.jpgimage/pjpeg261KFigure S5. NVT hypocenters and 2005−2006 seismicity projected on the vertical plane, which is parallel to the trench strike.
grl24257-sup-0009-fs06.jpgimage/pjpeg208KFigure S6. Distribution of NVT epicenters and their horizontal errors.

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