Finite-fault slip models and relocated catalogs for two offshore northeastern Taiwan earthquakes (10 December 2020 and 27 December 2025)

This dataset contains finite-fault slip models and SSST-relocated earthquake catalogs for two intermediate-depth earthquake sequences offshore northeastern Taiwan: the 10 December 2020 (ML 6.6, Mw 6.1) sequence and the 27 December 2025 (ML 7.0, Mw 6.6) sequence. Both mainshocks occurred at depths of approximately 67–75 km within the Taiwan–Ryukyu subduction-collision transition zone. The dataset comprises six files: 1. Slip distributions on the preferred fault plane (NP2 of the BATS CMT solution; 12 × 12 sub-fault grid, 30 × 24 km fault box) for the 2020 and 2025 mainshocks. 2. Source-time functions for both mainshocks (time step dt = 0.01 s). 3. SSST-relocated earthquake catalogs spanning few days before through two to three weeks after each mainshock, containing foreshocks, the mainshock, and aftershocks (299 events for the 2020 sequence; 1170 events for the 2025 sequence). Catalogs were produced using machine-learning phase picking (RED-PAN; Liao et al., 2022), absolute location with NonLinLoc within a three-dimensional Vp and Vs velocity model (Lee et al., 2025), and four iterations of source-specific station term (SSST) corrections (Lomax & Savvaidis, 2022). Finite-fault slip distributions were obtained by joint wavelet-domain inversion of teleseismic body and surface waves and regional strong-motion records using WISP v1.1.0 (Goldberg et al., 2026; Ji et al., 2002, 2003). These data accompany the manuscript by Liao et al. (2026, submitted to Geophysical Research Letters), which interprets both sequences as ruptures along the boundary between subducted Luzon arc material and adjacent oceanic lithosphere, rather than on the Ryukyu plate interface. A README.md file documents file formats, column descriptions, and inversion parameters.