Three-Dimensional Q Tomography for Xiuyan Meteorite Impact Crater

• 责任者：Fan Jichang (Geophysical Exploration Center ; China Earthquake Administration ; Zhengzhou ; 450002 ; China) ; Liu Mingjun
• 刊名：Chinese Journal of Geophysics
• 出版年：2010
• 卷期：53(10)
• 关键词：陨石坑 ; meteor craters ; 层析技术 ; tomography ; 辽宁 ; Liaoning Province
• 页码：p.2367-2375
• 图表：7 illus., 34 refs.
• 分类号：0100
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

 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.