Following paper has been accepted by BSSA.

Y. Mukuhira, O.V. Polianinikov, M.C. Fehler, H. Moriya, 2020, “Low SNR microseismic detection using direct P-wave arrival polarization.”

and now it is online!

https://pubs.geoscienceworld.org/ssa/bssa/article/doi/10.1785/0120190192/587502/Low-SNR-Microseismic-Detection-Using-Direct-P-Wave