关于地震观测系统中滤波器的讨论

doi:10.12196/j.issn.1000-3274.2021.01.004

Abstract

Abstract: The data output by earthquake observing instruments installed at fixed stations is a time series, which reflects the changes of the observed object over time. In this case, it is very important to understand the frequency response of the instrument. This article regards any signal processing process related to frequency response as filters, such as filters related to the frequency response of the sensor, anti-aliasing filters in the data acquisition process, etc., and discusses carefully. In some cases, the anti-aliasing filter is ignored, because the observation object changes slowly with time, and it is considered that there is almost no high-frequency component. However, this understanding is incorrect, and frequency aliasing interference is often found in actual observations. A simulation calculation example is used to illustrate the influence of frequency aliasing interference on the observation data, to explain the unreasonable phenomenon of the coseismic waveform in the component strain observation.

Key words: Earthquake observation instrument, Filter, Frequency response

CLC Number:

P315.7

XUE Bing. Discussion on Filters in Earthquake Observation Instruments[J]. EARTHQUAKE, 2021, 41(1): 40-50.

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Discussion on Filters in Earthquake Observation Instruments

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