A study on the correlation between ground strain and pipe strain is carried out based on earthquake observation at the Chiba Experiment Station. A comparative analysis is performed in both the time and the frequency domains. Unreasonable peaks in the low frequency range are detected in the ground strain records. The characteristics of the cumulative power of strains are studied. More than 90% of the strain total power is found to be contributed by the frequency range between 0.1 and 6.5 Hz. The relative motion between pipe and soil is found to be negligible for the earthquakes considered in the analysis.

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