Establishing and Validating Empirically-Based Ground Truth Criteria for Seismic Events Recorded on Regional Networks (Postprint)

摘要

New empirically-based ground truth (EBGT) local criteria have been developed for a variety of geologic settings for which data sets containing GT0 events (explosions and mine tremors) are available, local crustal structure is well known, and hand-picked arrival times have been obtained. There are now criteria for the Main Ethiopian Rift and preliminary criteria for the Tibetan Plateau. In the geologically very complex region of the Main Ethiopian Rift, the 2003 Ethiopia-Afar Geoscientific Lithosphere Experiment (EAGLE; Maguire et al., 2003) data were used to obtain EBGT595% criteria. Four of the 25 large refraction line shots were used as reference events to develop the criteria; the remainder were used as verification shots. An event is required to be recorded on at least 8 stations within the local, the Pg/Pn crossover distance, and a network quality metric less than 0.43 for an event to be classified as EBGT595%. Using these criteria to identify GT events within the Ethiopian Broadband Seismic Experiment, ten events have been identified as EBGT595%. In addition, there is a set of 196 potential GT events for the EAGLE dataset, and from this set it is expected to obtain up to 20 new GT5 events.