Three-Dimensional Q Tomography for Xiuyan Meteorite Impact Crater
In this paper, three-dimensional Q structure has been obtained for the first time by using seismic refraction data in order to get a total understanding of the crater. Q value structure is of great significance for understanding the non-elastic and non- uniform nature of the crust. Using three-dimensional Q tomography method based on absorption characteristic time t*,the amplitude spectra have been obtained and by fitting the amplitude spectrum, t* values have been obtained, which reflect seismic wave attenuation. The three- dimensional Q value structure has been obtained by using t* values through three-dimensional Q tomography method. The results showed that the Q-value layer from the surface to the depth of 100 m within the crater corresponds to the upper 107 m thick lake sediments, the Q-value layer from the depth of 100m to 300 m corresponds to the lower 188m thick breccia accumulation lens. The Q-value layer from the depth of 300 m to 700 m corresponds to the broken Lower Proterozoic metamorphic rock layer with less impacting.