“…These oscillations can be classified into two groups, the primary and secondary microseisms, which vary in generation Microseism body waves have received a great deal of attention (e.g., Boue et al, 2013;Capon, 1973;Euler et al, 2014;Farra et al, 2016;Gal et al, 2015;Gerstoft et al, 2008;Gualtieri et al, 2014;Haubrich & McCamy, 1969;Koper et al, 2009Koper et al, , 2010Lacoss et al, 1969;Landès et al, 2010;Liu et al, 2016;Neale et al, 2017;Nishida & Takagi, 2016;Obrebski et al, 2013;Pyle et al, 2015;Reading et al, 2014;Toksöz & Lacoss, 1968;Traer et al, 2012;Zhang et al, 2009Zhang et al, , 2010 which can be attributed to the fact that back azimuth and velocity obtained from plane wave beamforming provide information on their spatial source region. On the other hand, the analysis of microseism surface waves (e.g., Behr et al, 2013;Bromirski & Duennebier, 2002;Bromirski et al, 2005Bromirski et al, , 2013Brooks et al, 2009;Cessaro, 1994;Chevrot et al, 2007;Friedrich et al, 1998;Gal et al, 2017;Juretzek & Hadziioannou, 2017;Kedar et al, 2008;Obrebski et al, 2012;Roux et al, 2005;Schulte-Pelkum et al, 2004;Stehly et al, 2006) for constraining their source regions has experienced limited application. Triangulation of back azimuths from multiple arrays is a common approach to i...…”