Abstract:We calculate the strain parameters of hourly point values, daily average values, 5-day average values and 30-day average values, based on five sets of four-component borehole strain observation data installed in the Xinzhou area of north Shanxi province. We calculate and analyze the tidal factors of borehole strain observation data by harmonic analysis of Venidikov. The results showed that the rate of change of the maximum principal strain ε1, minimum principal strain ε2, surface strain εa, and shear strain εs of the five measuring points maintain a relatively constant level. The principal direction φ is unchanged roughly, and the rose map of tidal factor is also almost unchanged, indicating that the strain field is relatively stable. The results of the study are basically consistent with the characteristics of current seismic activity, focal mechanism solutions and fault properties in the area.
CHEN Yongqian,ZHANG Shuliang,LI Hongwei. Analysis on Characteristics of Regional Strain Field Based on Four-Component Borehole Strain[J]. jgg, 2021, 41(10): 1095-1100.