Detection and analysis of small magnitude events is valuable for better characterization and 15 understanding of reservoirs in addition to developing strategies for mitigating induced seismicity. 16 Three-component receivers, which are now widely used, are commonly deployed in boreholes to 17 provide continuous seismic data amenable to novel and powerful analysis. Using 18 multicomponent continuous records of ground motion, we utilize two principal features of the 19 direct P-wave arrival 1) linearity and 2) polarization in the direction along the ray path to the 20 source region to detect small magnitude events undetectable by conventional methods. We 21 evaluate the linearity of polarization and direction of arrival in the time and frequency domains 22 by introducing the Spectral Matrix analysis method, and combine them into a scalar 23 characteristic function that is thresholded for event detection purposes. We boost the signal-to24 noise ratio by stacking characteristic functions obtained at different 3-component receivers along 25 an empirical moveout of a master event known to have occurred in an area of interest.