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由国家地震局地壳应力研究所研制并在峰峰矿务局地震台安装的一台体积应变仪,使用两年多来资料连续,稳定、清晰,观测精度已达到4×10~(-9)量级。1985年11月30日邢台5.3级地震前50天记录到一个3×10~(-7)量级的压性应变,震前4个多小时又记录到一个1.5×10~(-8)量级的压性应变阶。这可能反映了这次地震前应力的积累和释放过程,对研究地震的孕育和发生是一个很难得的重要资料。
A volumetric strain gauge developed by the Institute of Crustal Stress of the State Seismological Bureau and installed at the Seismic Station of Fengfeng Mining Bureau has been used continuously and stably for more than two years. The observation accuracy has reached 4 × 10 ~ (-9) Magnitude. Fifty days prior to the M 5.3 M.5 Xingtai earthquake on November 30, 1985, a compressive strain of the order of 3 × 10 -7 was recorded. A volume of 1.5 × 10 -8 was recorded more than 4 hours before the earthquake Grade of compressive strain order. This may reflect the process of stress accumulation and release prior to the earthquake and is a rare and important data for the study of the occurrence and occurrence of earthquakes.