Abstract：Using minute, 1 sps, 10 sps and 100 sps sampling rate observation data from a 4-component borehole strainmeter at Huangyuan station, we study the co-seismic variation of Maduo M7.4 earthquake in Qinghai by self-check analysis, co-seismic strain step analysis and spectrum analysis. The results show that the seismic wave information recorded by minute sampling is seriously lacking. If we use the minute value data to study the initial motion of seismic wave and the amplitude of co-seismic variation, we obtain a conclusion of low reliability. The higher the sampling rate, the stronger the ability to record strain seismic wave information, but the difference between 100 sps sampling and 10 sps sampling is not significant, and 10 sps sampling basically records more comprehensive strain seismic wave information. The variation property and amplitude of co-seismic strain steps are independent of sampling rate, and the minute sampling data can be used for related research. When the 4-component borehole strainmeter is set up in the future, the sampling rate should be increased to at least 1 sps.
TANG Lei,QIU Zehua,FAN Junyi et al. Characteristic Analysis of Coseismic Variation of 4-Component Borehole Strain Observation with Different Sampling Rates[J]. jgg, 2022, 42(11): 1196-1201.
