## 4 Results
### Analysis of the Displacement of the Monitors  
Figure 16 shows the displacement time history curves in four cases. The monitors without displacement are not shown in the figure. The number of effective monitors is 7/6/5/4 for four cases, respectively, and the displacement trend is similar. Here, let \(D_{n}\) denote the displacement of monitor n (\(n\) = 1-7).  
Figure 14: _Cont._Figure 14: Time history curves of velocity of monitors in the high-steep rock slide process. (**a**) Case: 1: EW seismic wave; (**b**) case 2: NS seismic wave; (**c**) case 3: UD seismic wave; and (**d**) case 4: EW_NS_UD seismic wave.  
Figure 15: Comparison of maximum velocities of the monitors (**a**) and their appearance time (**b**) in 4 cases.  
As an illustration, Figure 17 shows the characteristics of case 1. From the two horizontally arranged monitors 1/2/3 (Figure 17a) and monitors 4/7 (Figure 17b), we can observe that the value of displacement is \(D_{3}>D_{1}>D_{2}\) (\(D_{4}>D_{7}\)), and the time for reaching the maximum displacement is that \(D_{3}\) is earlier than \(D_{2}\), which is earlier than \(D_{1}\) (\(D_{4}\) earlier than \(D_{7}\)). The results consist with the previous section conclusion, \"the velocity of the slope's edge is larger than that of the inside\". The results show that (1) the rear rock has a more significant displacement than the front rock, and the displacement of the edge of the slope is more significant than that of the inside; and (2) the stable time is inversely related to the distance from the edge rock. The other three cases also have the similar conclusion. It is worth mentioning that in case 4, \(D_{1}\) is the largest, followed by \(D_{3}\) and \(D_{2}\).  
From the longitudinally arranged monitors 3/4/5/6 (Figure 17c) and monitors 1/7 (Figure 17d), we can observe the displacement characteristics along the vertical direction. The order of displacement from large to small is \(D_{3}\approx D_{4}>D_{5}>D_{6}\) (\(D_{1}>D_{7}\)), and the stable time is \(D_{3}<D_{4}<D_{5}<D_{6}\) (\(D_{1}<D_{7}\)). The results show that the displacement values  
Figure 16: Time history curves of displacement of monitors in the high-steep rock slide process. (**a**) case 1: EW seismic wave; (**b**) case 2: NS seismic wave; (**c**) case 3: UD seismic wave; and (**d**) case 4: EW_NS_UD seismic wave.  
are related to slope altitude under seismic loading, while stable time is inversely related, as is the case in the other three cases.  
Figure 17(a) shows no significant difference in the displacement value of \(D_{3}\) in four cases. The difference in displacement gradually increases as the altitude decreases. The order of \(D_{4}\), which is case 1 > 2 > 3 > 4, has the largest displacement difference in different cases. \(D_{5}\) is the same as \(D_{4}\), and the displacement order is case 2 > 3 > 1 \(\approx\) 4. In conclusion, the response of different seismic waves at low altitudes is different, and the effects of seismic waves in high-altitude areas are equivalent.  
Figure 17: Time history curves of displacement of monitors under the EW seismic wave loading. Horizontally arranged monitors 1/2/3 (**a**) and 4/7 (**b**); longitudinally arranged monitors 3/4/5/6 (**c**) and 1/7 (**d**).