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The principles and applications of laser real-time holographic interferometry (LRTHI) and radar differential inter-ferometry (RDI) technologies are described in this paper, respectively. By using LRTHI, we can observe the de-formation of samples under pressure in the lab and study the anomaly characteristics relating to different strain fields in different fracture-developing areas; while by using RDI, we can observe the landform and surface defor-mation. The results of deformation observed before and after the MS=7.9 Mani earthquake (Tibet) and MS=6.2 Shangyi-Zhangbei earthquake in China are obtained. It is pointed out that LRTHI and RDI are similar, which study the characteristics of anomalous deformation field by fringe variations for both of them. Therefore, the observation of deformation field in the seismogenic process, especially in the period impending an earthquake by RDI, and the comparative study in the lab by LRTHI are of great significance.
The principles and applications of laser real-time holographic interferometry (LRTHI) and radar differential inter-ferometry (RDI) technologies are described in this paper, respectively. By using LRTHI, we can observe the de-formation of samples under pressure in the lab and study the anomaly characteristics relating to different strain fields in different fracture-developing areas; while by using RDI, we can observe the landform and surface defor-mation. The results of damping observed before and after the MS = 7.9 Mani earthquake (Tibet) and MS = 6.2 Shangyi-Zhangbei earthquake in China are obtained. It is pointed out that LRTHI and RDI are similar, which studies the characteristics of anomalous deformation field by fringe variations for both of them. Therefore, the observation of deformation field in the seismogenic process, especially in the period impending an earthquake by RDI, and the comparative study in the lab by LRTHI are of great significance.