基于构造物理模拟实验的隐伏断层跨断层场地监测效果分析——以宁河场地为例

以宁河跨断层场地为例，运用砂箱实验方法进行构造物理模拟实验，结合现有的浅层地震剖面结果和跨断层监测数据，分析跨断层场地监测对隐伏断层断裂活动监测是否有效。初步研究结果表明，当观测精度高于误差时，跨断层场地监测能有效监测隐伏断层活动。模拟的断裂剖面与浅层地震剖面结果中断层分布和发育情况基本一致，隐伏断层活动可引起地表形变。由于各次级断裂的倾向不同，跨断层监测数据可能产生逆断层假象。同时提出宁河跨断层场地水准点位分布情况模式图。

Analysis of Monitoring Effect of Buried Fault Cross-Fault Site Based on Structural Physical Modeling Experiment:A Case Study of Ninghe Site

We use sandbox experiment for structural physical modeling, and combine with seismic survey results and cross-fault observation data, to analyze whether the buried fault activity monitored by Ninghe cross-fault site is effective. The results reveal that when the observation accuracy is higher than the error, cross-fault site monitoring can effectively monitor the activity of buried faults. The distribution and development of the simulated fault profile are consistent with the shallow seismic profile, and surface deformation can be caused by buried fault activity. Due to the different fault tendency of each secondary fault, cross-fault monitoring data may give rise to the illusion of reverse fault. The model diagram of horizontal point position distribution of Ninghe cross-fault monitoring site is presented.