Relative and calibrated stress-drop catalog for 2015–2024 Ridgecrest, California earthquakes from spectral-ratio asymptotes.

Relative and calibrated stress drops for the Ridgecrest earthquake sequence from the spectral-ratio-asymptote graph inversion of Knudson, Shaw, Ellsworth & Beroza. Preferred configuration: k_nn = 8, 1.5 km edge cap, adaptive LF band, P+S combined, relay threshold M2.3, slope weight W = 0.25 (Table 1 of the paper). One row per event in the inversion graph. Columns: event_id SCSN event identifier origin_time_utc origin time (ISO 8601, UTC) from the SCEDC relocated catalog latitude, longitude degrees; depth_km in km (GrowClust location where available) catalog_magnitude SCSN catalog magnitude; magnitude_type: l = ML, lr = Mlr, w = Mw, blank = no type recorded (1-D/3-D located events) location_method gc = GrowClust (Trugman & Shearer 2017), 1d = Hypoinverse, 3d = SIMULPS growclust_relocated True if GrowClust relocated the event (nbranch > 1) role dual-band (M2.5-4.0, both LFL and HFL solved; the reported population), relay (M2.3-2.5, in the LFL block and additionally admitted to the HFL block to connect it; excluded from reported statistics), LFL-only (M < 2.3), HFL-only (M > 4.0) hf_group main = connected to the main high-frequency group (1961 dual-band events); disconnected = one of the 24 groups whose level relative to the main population is undetermined (their relative values are internal to the group) n_pairs number of spectral-ratio pairs involving the event (graph degree) mean_pair_separation_m mean 3-D separation of the event's pairs, metres LFL_rel, HFL_rel relative low- and high-frequency levels, log10 units (Eqs. 23-25; each block is zero-mean over the dual-band population) SD_rel_log10 relative log10 stress drop, 1.5*HFL_rel - 0.5*LFL_rel (Eq. 26); dual-band only SD_log10_MPa, SD_MPa calibrated stress drop (Brune model, k = 0.37, beta = 3.5 km/s; Section 6.3); calibration constant C = 6.75 for stress drop in Pa sigma_jackknife per-event uncertainty from the delete-20% pair jackknife, log10 units sigma_bootstrap per-event uncertainty from the station bootstrap, log10 units Catalog and waveforms: Hauksson et al. (2012) relocated catalog, 1981-2024 GrowClust extension distributed by the SCEDC; waveforms and parametric data from the Caltech/USGS Southern California Seismic Network (doi:10.7914/SN/CI) stored at the SCEDC (doi:10.7909/C3WD3xH1).