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Taking more than 300 seismograms as input, we comprehensively studied microearthquake spectra in the frequency range of 1.5 to 12 Hz. The estimated values of $Q_P^{-1}$ and $Q_S^{-1}$ show strong frequency dependence. The relationships emerge to be $Q_P^{-1}=(23.8\\pm 6)\\times10^{-3}f^{-1.2\\pm 0.008}$ and $Q_S^{-1}=(10.2\\pm 2)\\times10^{-3}f^{-1.3\\pm 0.02}$, respectively. 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