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. 2024 Dec 30;14:31843. doi: 10.1038/s41598-024-83107-x

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© The Author(s) 2025

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Fig. 7 — Waterfall plot of DAS strike 1 data at source location S1. Annotated fibre sections are delineated by solid lines and dashed vertical lines indicate the turning points between out and in sections, except for the extra fibre (EF) section that has additional turning points as shown in Fig. 2b. Note that the EF section does not contain these fast arrivals. The magnified inset shows the fast wave as seen on the small cable (SD) and the dashed line corresponds to a velocity of > 3000 ms^-1. AF: additional fibre attached to the outside of the SD and LD cables.