In this article we have made analyses and comparisons of synchronized data from an extensometer and a 4-component borehole strainmeter at Yingkou seismological station.
2
大地震之前两年九个月,营口台P波残差已持续升高了一年四个月。
During two years and nine months before the shock, increase of P wave residuals at this station lasted for one year and four months.