Heifangtai landslide seismic study: processed source data underlying the figures

Processed and derived source data underlying Figures 1–4 and Supplementary Figures S1–S4 of the manuscript “Seismic Records Reveal Rayleigh-type Precursors before Loess Landslide Failure”. The record contains display-rate waveforms, PSD and time-frequency matrices, model-selection metrics, daily counts, histogram and quantile summaries, selected normalized examples, and daily meteorological derivatives. It excludes the raw 30-day continuous waveforms and the complete 19,940-event catalogue. The package includes a README, file-to-figure mapping, units, processing notes, checksums, and validation metadata. Daily meteorological variables are derived from Open-Meteo data and redistributed under CC BY 4.0; full attribution and processing details are provided in README.md.