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Fig. 2 | Earth, Planets and Space

Fig. 2

From: Earth’s free oscillations excited by the 2011 Tohoku earthquake recorded in multiple GPS networks

Fig. 2

Frequency-domain power spectral stacks (in dB) to show the normal modes, from 1019 station 3-D (E/N/U-components) records of the Japan GEONET network for the 2011 Tohoku earthquake. a Sum-periodogram (corresponding to Fig. 2 of Mitsui and Heki 2012; no relative vertical shift); b product-periodogram (the low-frequency portion of the middle panel shifted downward to show the upper details). The vertical solid/dash lines indicate the degenerate eigenfrequencies of the fundamental spheroidal/toroidal multiplets according to PREM model

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