Fig. 7From: Earth’s free oscillations excited by the 2011 Tohoku earthquake recorded in multiple GPS networksThe same as Fig. 4, but for the global IGS network of 146/143 stations for l = 1 (m = − 1, 0, 1): a U-component of spheroidal modes; b N/E-component of spheroidal modes; c N/E-component of toroidal modes. The vertical solid/dashed lines indicate the PREM eigenfrequencies of the spheroidal/toroidal fundamental modesBack to article page