A unified map of Moho depth and V-p/V-s ratio of continental China by receiver function analysis

作者：He, Rizheng^*; Shang, Xuefeng; Yu, Chunquan; Zhang, Haijiang; Van der Hilst, Robert D.

来源：Geophysical Journal International, 2014, 199(3): 1910-1918.

DOI：10.1093/gji/ggu365

• Time-series analysis
• Gravity anomalies and Earth structure
• Broad-band seismometers
• Body waves
• Computational seismology
• Cratons

Continental China consists of a complex amalgamation of geotectonic units and has experienced strong and widespread tectonic deformation since the Mesozoic. To understand its geological structure better, we conducted a systematic receiver function analysis using a total of 83 509 teleseismic traces in the time period of 2009-2010 recorded by 798 broad-band stations, among which 749 stations are permanent digital seismic stations from China Earthquake Networks Center and 49 stations were temporarily deployed in northern Central Tibet. A standard H-kappa stacking method is employed to determine Moho depth and V-p/V-s ratio underneath each station from teleseismic receiver function analysis. The obtained Moho depth variations are generally consistent with those determined from various deep seismic soundings profiles. We combine our results with those from previous receiver functions studies to produce a high-resolution map of Moho depth and V-p/V-s variation for continental China. Compared to previous studies, the new study concerns many more stations and the resulting Moho depth map has much higher lateral resolution, especially in the eastern China. Overall, the Moho depth variation has a remarkable correlation with major tectonic units in continental China. For example, across the well-known gravity gradient line in east China, there is a clear shift in Moho depths. In general, the map of V-p/V-s ratio shows relatively high anomalies underneath Tibetan Plateau, along the gravity gradient line, and under several volcanoes.

• 出版日期2014-12
• 单位中国科学技术大学; MIT; 中国地质科学院