马陵山和相公庄台钻孔体应变观测质量影响因素分析

Factors Affecting the Observation Quality of Borehole Volume Strain Meters at the Malingshan and Xianggongzhuang Stations, Shandong Province

摘要:

对山东省内同一条断裂带内，气象条件相同、地理位置相近的两个台站体应变仪进行分析，探讨影响体应变观测质量的因素。结果表明：（1）两个台的数据完全符合规范中所要求的M₂波潮汐因子相对误差δ_α/α ≤ 0.05的精度指标；2016年月平均精度：相公庄台为0.015 1，马陵山台为0.032 1，相公庄高于马陵山。（2）两个台站受降雨、水位和气压影响明显，体应变和气压相关程度达到0.85以上。（3）两个台站均位于断裂带或其附近，除仪器及其他干扰因素外，井孔条件是造成马陵山比相公庄台精度低的主要因素。

Abstract:

The factors affecting the observation quality of the borehole volume strain meters at two stations along the same fault zone in Shandong Province were analyzed and discussed. The two stations are under the same meteorological conditions and are at similar geographical positions. Results revealed the following information. (1) The data of two stations conformed completely to the accuracy index required in the specifications. The relative error of the M₂ wave tidal factor was δ_α/α ≤ 0.05. The average monthly accuracy of Xianggongzhuang Station in 2016 was 0.015 1 and was higher than that of Malingshan Station, which had a monthly average accuracy of 0.032 1. (2) The two stations were affected by rainfall, water level, and air pressure, and the correlation degree between volume strain and air pressure exceeded 0.85. (3) Both stations are located at or near the fault zone. In addition to instruments and other interference factors, borehole condition is the major factor that accounted for the lower precision of Malingshan Station than that of Xianggongzhuang Station.