Extracting and Characterizing Near-Fault Effects from the 2022 Chishang Earthquake: Methodology and Validation

This project provides near-fault ground motion recordings from the 2022 Chihshang, Taiwan, earthquake sequence, including the M6.5 Guanshan foreshock and the M6.9 Chihshang mainshock. The baseline-corrected time histories retain key near-field effects, including dynamic velocity pulses primarily caused by forward rupture directivity, and fling-step pulses that result in permanent displacement offsets. Estimated permanent displacements derived from the processed records show good agreement with independent GNSS measurements. Details of the signal processing methodology are presented in: Lavrentiadis G, Asimaki D, Carey TJ, and Mason HB Extracting and Characterizing Near-Fault Effects from Strong Motion Observations of the 2022 Chihshang Earthquake Sequence: Methodology and Validation (Currently under review at the Bulletin of the Seismological Society of America) The associated processing code is available at: https://github.com/glavrentiadis/geer_2022chihshang_ground_motions/tree/master