Vibroseis gives the earth controllable signaltrain whose frequency spectra can be artificially changed, therefore data quality can be improved by controlling the signal excitation of vibroseis.
可控震源输入到大地的信号是己知的，频谱可以人为地改变，因而有可能从激发地震信号方面来改善资料品质。
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We apologize to customers, but due to signal problems the 11:28 train to Hangzhou from Platform 15 has been cancelled.