Seismic Amplification by Two-dimensional Dynamic Analysis at the Archaeological Park of Sacsayhuaman

The research was carried out at the Archaeological Park of Sacsayhuaman, located in the region of Cusco, Peru. It examines the evaluation of the dynamic response of soils using two-dimensional models and the finite element technique. This analysis allows to determine the seismic behavior of the site in terms of the seismic amplification resulting from the existing stratigraphy and topograph. The purpose is to analyze the seismic amplification of the ground surface of the various sections chosen in the study area. For this purpose, two representative sections of the stratigraphic profile and the geometric conditions were selected. Non-destructive techniques were used to conduct geophysical survey applying Multichannel Surface of Wave Analysis (MASW), Seismic Refraction, Microtremor Array Measurement (MAM), methods as well as the Nakamura technique for fundamental period studies. Georadar (GPR) surveys were also performed. The analysis was performed using the two-dimensional Equivalent Linear Method, using Shear Modulus Reduction and Damping Ratio Curves for soil and rock, with amplifications within the range of 1.1 to 1.6. Also, the Fourier spectral ratio of the surface register and the rock record was determined to obtain the soil vibration period, which was then compared with vibration period obtained from microtremor measurements.