Moho depth distribution character beneath the Ordos block's southeastern margin areas

作者：Ren Xiao^*; Xu Zhi-Guo; Yang Hui; Chen Hong-Feng; Zou Li-Ye

来源：Acta Geophysica Sinica, 2012, 55(12): 4089-4096.

DOI：10.6038/j.issn.0001-5733.2012.12.021

• Receiver function
• Permanent stations
• Moho depth
• Geological structure

The Ordos Block's Southeastern Margin areas are a region of strong historical earthquakes where had happened a few strong earthquakes above magnitude 6. 0, so these areas have strong seismicity. We selected broadband teleseismic waveform data recorded by the permanent stations spread over Ordos Block's Southeastern Margin areas to get P wave receiver function using deconvolution in Frequency Domain, then the Moho depth and V-p/V-s ratio in the Ordos block's Southeastern Margin Areas are estimated by teleseismic receiver function using H-kappa method. Our study shows that the velocity ratio in this region is between 1. 6 and 1. 9, and the Moho depth beneath the Eastern areas is between 33. 4 similar to 45 km. The lowest Moho depth of the areas lies in Taiyuan basin and it is about 33. 4 km. Around Yanhuai basin, Weixian basin, Yangyuan basin and Linfen basin, the Moho depth is about 40 km. The Moho depth beneath the southern areas is between 31. 0 similar to 53.1 km, and gradually increases from eastern areas to western areas. Therefore, the Moho depth and the velocity ratio show strong lateral variations with geological structure in the areas.

• 出版日期2012-12
• 单位中国地震局; 中国地震台网中心