Passive seismic data has been known to have low signal‐to‐noise ratio (SNR) making it challenging to pick event first arrivals. Many of the techniques already in use for enhancing the first arrivals in earthquake and exploration data can be used for enhancing first arrivals in passive microseismic records. A method most commonly used in earthquake seismology is the short‐term average to long‐term average ratio (STA/LTA), in which the ratio of energies in two time windows is used to enhance the first arrivals of the records (Baer and Kradolfer, 1987). Kurz et al. (2005) provides a thorough review of...
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