| 摘要 |
A method of monitoring a microseismic event comprises detecting the event to produce a first signal dependent on the event, the first signal including noise at a frequency off Hz (e.g. 50 Hz); taking a first sample of the first signal; taking a second sample of the first signal, the second sample occurring n/f seconds after the first sample , where n is an integer (e.g. 1); and subtracting the first and second samples from each other to produce a further signal dependent on the event in which the noise has been at least partly compensated for.
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