We have inverted for the Rayleigh wave group velocity distribution of east region of Guangdong Province at periods of 5 ～ 14s using vertical component of ambient seismic noise tomography. Seven months continuous data （March to September, 2011 ） used in this study are from 26 permanent seismic stations of the Guangdong Regional Seismic Network and its adjacent stations in Fujian and Jiangxi Provinces. Green＇s functions were first extracted from crosscorrelations of data at adjacent stations and group velocity dispersion measurements were then made using the frequency-time analysis method. Our results show significant lateral variations in uppermost crustal structures of the region. Group velocity anomalies at short periods correlate well with the surface geology of basins and mountains. The slow velocity anomaly at basin area suggests a rather thick sediment deposit, and the high velocity anomaly at mountains suggests a shallow buried depth of basement. Geothermal was an important impact factor for group velocity, and the slow velocity anomaly generally correlate with the area of high geothermal. A low-velocity layer may exist in the middle crust in the eastern region of Guangdong, especially in the coastal area of the region.[著者文摘]