天ケ瀬地殻変動観測所で観測される局所地震のS波の性質について

Abstract

Natures of S waves from local small earthquakes were examined with particle motiondiagrams and following observational facts were obtained, (1). Particle motion diagrams of initial parts of S waves show fairly good liniarity.(2). All of the particle motion diagrams in the horizontal plane are polarized to the directionscorresponding to those of P nodal lines.(3). Differences of onsets of SH and SV phases are not found.