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Earth, Planets and Space
Fig. 6. | Earth, Planets and Space

Fig. 6.

From: Mitigating artifacts in back-projection source imaging with implications for frequency-dependent properties of the Tohoku-Oki earthquake

Fig. 6.

Back-projection of the Tohoku-Oki earthquake at various periods (1 s~16 s) of the USArray and European array data with the linear stacking and MUSIC approaches. The hypocenter is denoted by the black asterisk. The location of the radiators are colored by time and sized by the amplitude with respect to the maximum. The blue asterisks are the “temporal local maxima” of the stacking result. The background grey lines are 12 m, 14 m and 36 m slip contours of a geodetic and seismic joint inversion model (Wei et al., 2012). The beamforming results are dominated by the artifact at periods longer than 4 s. The MUSIC results are consistent over all frequency bands. Minor up-dip migration shows up in the period of 1 s~8 s at the USArray, but is within the range expected from the “swimming” artifact and is absent in the European network.

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