## 3 Results and Discussion
### Dynamic Shear Modulus Characteristics  
Loess has long been a focus of researchers due to its strong sensitivity to water and its vulnerability to earthquakes, particularly in terms of its dynamic properties, such as the dynamic shear modulus. However, little research has been conducted on whether the dynamic properties of the deposited soil mass change significantly after experiencing a landslide. We normalized the results using G/Gmax-\(\gamma\), and the experimental and fitting results are shown in the Figure 10, where the soil samples of \(D04\), \(D10\), \(D20\), \(D30\) and \(S04\), \(S10\), \(S20\), \(S30\) were subjected to resonant column tests with varying confining pressures of 50, 100, 200, and 300 kPa. The trends in the changes in the loess and landslide deposits under different consolidation pressures were similar, with the attenuation rate slowing down as the confining pressure increased. The attenuation of the intact loess was slower than that of the landslide deposits at the same burial depth. The G/Gmax-\(\gamma\) of the intact loess had a larger variation range than that of the landslide deposits under different confining pressures, indicating the pressure sensitivity of the intact loess, especially at depths of 4 m and 20 m. At a depth of 30 m, the curves for both the undisturbed loess and the landslide deposit are relatively similar. The test results were processed using [PERSON]'s model [34; 35] to obtain the maximum dynamic shear modulus (Gmax) of the soil samples. As shown in the Figure 11a, both the undisturbed loess and the landslide deposit exhibit an increase in their dynamic shear modulus (Gmax) with rising confining pressures. Nevertheless, across various depths, the Gmax of the intact loess and the landslide deposit does not exhibit significant differences in most cases. There is an exception in the S10 depth group, where the Gmax is notably higher than the other depth groups. Within the soil samples taken from different depths of both the loess and landslide deposits, the rate of change in the dynamic shear modulus with the increasing confining pressure varies. Notably, for the intact loess with pronounced structural characteristics, the rate of change is slower in the upper layers compared to the deeper layers when subjected to the increasing confining pressures. Furthermore, the Gmax acquired via the shear wave velocity method surpasses the values obtained from conventional laboratory tests. This suggests that the shear wave velocity method is able to predict the shear wave velocity method. Figure 11: (**a**) Mean effective confining pressure with the maximum dynamic shear modulus (Gmax) of undisturbed loess and landslide deposit, and (**b**) water content w (%) with the maximum dynamic shear modulus (Gmax) of undisturbed loess and landslide deposit. Figure 10: Dynamic shear modulus ratio and dynamic shear strain curve of undisturbed loess and landslide deposit in different depths. velocity method is more sensitive and capable of providing a more accurate measurement of the maximum dynamic shear modulus of the soil. The moisture content is one of the key control factors for the maximum dynamic shear modulus of loess. [PERSON]'s [36] experimental results showed that the maximum dynamic shear modulus of loess increased in three stages as the moisture content increased. When the moisture content of the loess is below its plastic limit, the dynamic shear modulus (Gmax) decreases with the increasing moisture content. When the moisture content of the loess approaches its plastic limit, Gmax undergoes a sharp decrease, reaching its maximum attenuation rate. As the moisture content of the loess further increases and exceeds its plastic limit, the attenuation trend of Gmax slows down and gradually stabilizes, even approaching saturation. Under low confining pressures, the initial dynamic shear modulus Gmax of the intact loess exhibits relatively weak sensitivity to the water content, but as the confining pressure increases, the water sensitivity of the loess becomes more pronounced.