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We present results of our preliminary analysis of acoustically active X-classflare of September 7, 2011. We report two acoustic sources detected viaacoustic holography and verified by finding a ridge in time-distance diagrams.We compare the directional information extracted from time-distance andacoustic holography, showing a good agreement in this case. We report that thedirection where amplitude of the wave-front is the largest lies through thestrong magnetic field and sunspot, suggesting that absorption of the acousticwave power by magnetic field can be ruled out as a wave anisotropy mechanism inthis case.

On the Seismicity of September 7, 2011 X1.8-class Flare