2026_daseffMOD: Continuous Field DAS Records for Effective Rayleigh-Wave Mode Analysis

This dataset contains three consecutive approximately 60-s continuous distributed acoustic sensing (DAS) records acquired during an active-source field test on 26 May 2026. The records preserve the native vendor output and include embedded hammer impacts that can be located and windowed independently by users. Each record contains 30,000 time samples and 921 spatial loci. The nominal temporal sampling rate is 500 Hz, the spatial sampling interval is 0.2 m, and the DAS gauge length is 1 m. The released files cover the continuous acquisition interval used to identify the hammer-shot records associated with the field installation shown in the manuscript. The DAS field measurements were acquired by the authors. Guangzhou Metro Group Co., Ltd. provided engineering borehole information and field-test conditions. Ningbo AllianStream Photonics Technology Co., Ltd. provided the ixDAS3000 interrogator and technical support.