RZB型钻孔应变仪在青藏高原东缘地应力监测中的应用

Application of the RZB Borehole Strainmeter in Crustal Stress Observation at the Eastern Margin of the Tibet Plateau

介绍新一代RZB-3型钻孔应变仪,及其用于地壳应力应变连续观测的特点。对四川江油地应力监测站RZB-3A型分量式钻孔应变仪观测数据进行了初步分析,结果表明:安装于江油地应力监测站的RZB-3A型分量式钻孔应变仪有着较高的分辨率。系统参考元件的数据表明,观测系统分辨率优于10?9应变量级,不仅记录到清晰的固体潮汐,还记录到宽频带应变地震波。特别地,由于四分量钻孔应变观测的优越性,已经获得的数据表明,该观测系统对台站邻区地壳水平应变场的面应变测量精度较高。因此,将新型分量式钻孔应变仪应用于青藏高原东缘地应力连续观测,对于揭示该区域应力场活动与地震的关系有重要意义。

The authors introduce a new generation RZB borehole strainmeter and its application in crustal stress observation. The preliminary analysis of the monitoring data from the RZB-3A borehole strainmeter installed in crustal stress station of Jiangyou in Sichuan show that the resolution of the observing system is better than 10-9 strain megnitude. The borehole strainmeter not only recorded strain tide, also recorded broadband strain seismic wave. Especially, because of the superiority of the 4-component borehole strain observation, the obtained data show that RZB-3A borehole strainmeter has high measurement accuracy of plane strain in crustal horizontal strain field of the area around the observation station. Therefore, it is significant to reveal the relationship between the activity of stress field and earthquake to use the new multi-component borehole strainmeter to develop crustal stress continuous observation in the eastern margin of the Tibet Plateau.