## Electronic Supplement to

Characterizing Local Variability in Long-Period Horizontal Tilt Noise

by M. D. Rohde, A. T. Ringler, C. R. Hutt, D. C. Wilson, A. A. Holland, L. D. Sandoval, and T. Storm

This electronic supplement contains a schematic of the underground vaults, power spectral density (PSD), and pairwise mean coherence plots (Figs. S1–S25).

### Figures

Figure S1. Schematic of the Albuquerque Seismological Laboratory underground vaults.

Figure S2. PSD estimates for array 1 vertical components (channel BH0).

Figure S3. PSD estimate for array 2 vertical components (channel BH0).

Figure S4. PSD estimates for array 3 vertical components (channel BH0).

Figure S5. PSD estimate for array 4 vertical components (channel BH0).

Figure S6. PSD estimates for array 1 north–south components (channel BH1).

Figure S7. PSD estimate for array 2 north–south components (channel BH1).

Figure S8. PSD estimates for array 3 north–south components (channel BH1).

Figure S9. PSD estimate for array 4 north–south components (channel BH1).

Figure S10. PSD estimates for array 1 east–west components (channel BH2).

Figure S11. PSD estimate for array 2 east–west components (channel BH2).

Figure S12. PSD estimates for array 3 east–west components (channel BH2).

Figure S13. PSD estimate for array 4 east–west components (channel BH2).

Figure S14. Pairwise coherence for vertical component (BH0 channel) of array 1 from 100 to 500 s period.

Figure S15. Pairwise coherence for north–south component (BH1 channel) of array 1 from 100 to 500 s period.

Figure S16. Pairwise coherence for east–west component (BH2 channel) of array 1 from 100 to 500 s period.

Figure S17. Pairwise coherence for vertical component (BH0 channel) of array 2 from 100 to 500 s period.

Figure S18. Pairwise coherence fOr north–south component (BH1 channel) of array 2 from 100 to 500 s period.

Figure S19. Pairwise coherence for east–west component (BH2 channel) of array 2 from 100 to 500 s period.

Figure S20. Pairwise coherence for vertical component (BH0 channel) of array 3 from 100 to 500 s period.

Figure S21. Pairwise coherence for north–south component (BH1 channel) of array 3 from 100 to 500 s period.

Figure S22. Pairwise coherence for east–west component (BH2 channel) of array 3 from 100 to 500 s period.

Figure S23. Pairwise coherence for vertical component (BH0 channel) of array 4 from 100 to 500 s period.

Figure S24. Pairwise coherence for north–south component (BH1 channel) of array 4 from 100 to 500 s period.

Figure S25. Pairwise coherence for east–west component (BH2 channel) of array 4 from 100 to 500 s period.

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