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Earth, Planets and Space
Fig. 2. | Earth, Planets and Space

Fig. 2.

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

Fig. 2.

Swimming effect in the 2D array response of the USArray (left two columns) and European array (right two columns) at frequencies of 1, 0.5, 0.25 and 0.125 Hz, with a color-coded array response normalized by its maximum, the white circle indicates the epicenter and a black star indicates the location of the maximum array response. Note that the swimming effect intensifies as the frequency decreases as in the 1D case, but the maximum swims in a direction that combines the longer axis of the array response and the source-to-array direction.

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