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Sacks-Evertson钻孔应变仪最深可置于500米的钻孔底部。这种仪器的主要优点是灵敏度高(可分辨10~(-11)应变)工作频带宽(频响曲线的平直段从零频至十几赫兹),动态范围大(10~(-11)至10~(-5)应变),由于安装在钻孔深部,尽可能地避免了太阳热辐射、降雨、地面振动等因素的干扰。它可用于地震前兆观测、确定震源过程、地球自由振荡、应变固体潮、火山活动与地质构造活动等方面的研究。
The Sacks-Evertson Drill Strain Gauge can be placed at the bottom of a 500-m drill hole. The main advantages of this instrument are high sensitivity (resolvable 10 ~ (-11) strain) wide operating frequency band (frequency response curve of the straight section from zero to ten hertz), large dynamic range (10 ~ (-11) To 10 ~ (-5) strain). As it is installed in the deep part of the borehole, interference from factors such as solar heat radiation, rainfall and ground vibration is avoided as much as possible. It can be used for earthquake precursory observation, to determine the source process, the Earth’s free oscillations, strained solid tide, volcanic activity and geological tectonic activity research.