武鄂黄黄都市圈背景噪声层析成像研究OA

Based on the continuous seismic ambient noise data from 48 stations in Wuhan-Ezhou-Huanggang-Huangshi(WEHH)metropolitan area and adjacent regions,we use ambient noise tomo-graphy method to obtain Rayleigh-wave phase velocity structure at periods of 5 s to 40 s.The results show that phase velocity structure of the upper to middle crust is closely correlated with regional tec-tonic units.The low-velocity anomalies are observed along the eastern margin of Jianghan basin and the southern margin of Dabie mountain,whereas the Dabie orogen is marked by high-velocity anoma-lies.In the middle to lower crust,the Moho topography influences the phase velocity structure,with a crust-penetrating low-velocity anomaly near the Wulongquan fault,suggesting a potential pathway for deep material upwelling.The Dabie orogen retains high-velocity anomalies associated with its met-amorphic basement.At greater depths,from the lower crust to the uppermost mantle,widespread low-velocity anomalies are observed,which may be attributed to lithospheric delamination or mantle-derived material upwelling.The low-velocity anomalies on both sides of Yangtze river are closely linked to the formation of middle-lower Yangtze metallogenic belt,reflecting a spatiotemporal cou-pling between deep geodynamic processes and shallow mineralization.This study has higher resolution than previous imaging results,which can provide more reliable insights for revealing the deep geody-namic mechanisms of regional tectonic evolution and mineralization.