华南地震2012，Vol.32Issue(3)：41-52,12.
广东地区地壳地震波速不均匀性研究
A Study on the Inhomogeneity of Crustal Seismic Wave Velocity in Guangdong
摘要
Abstract
Derived from Guangdong "10th Five" regional digital seismometry network since 2007, direct Pg waves and diffracted Pn waves travel time data (8821 in total) of 324 earthquakes, are used in genetic algorithms along with joint inversion within Guangdong province to acquire the one-dimensional velocity structure (horizontal layer) with minimum residual, as well as seismic origin time and location of the 324 earthquakes mentioned above. With this basis and narrowed range, considering the actual circumstances of the distribution of seismic stations and epicenters, the entire study region can be divided into seven areas. The transmission ray of each area will be fitted and iterated a second time to obtain the inversion result with minimum travel time residual. Finally, through "stitching" and "comparison" of velocity structures of all seven areas, the regional three -dimensional velocity structures and the deep structures may be explored and studied. In addition, it's simultaneously obtained that the crust thickness of the study region is 31.09 km; Crustal thicknesses of each layer: sedimentary 0.9 km, the upper crust 13.3 km; the middle crust 8.3 km and the lower crust 8.6 km. Thus concluding that most earthquakes in Guangdong and its neighboring provinces occurs in the upper crust, e.g. 14.2 km above, and there are a few in the middle crust ( 14.2～22.5 km) .The inversion results also show that most earthquake sources are located in the transition zone of high and low velocity bodies.关键词
广东地区/联合反演/一维速度结构/成析成像Key words
Guangdong Province/ Joint Inversion/ One -dimensional Velocity Structure/Tomography分类
天文与地球科学引用本文复制引用
陈贵美,杨选,何璟琳,胡文灼..广东地区地壳地震波速不均匀性研究[J].华南地震,2012,32(3):41-52,12.基金项目
广东省科技厅项目(2007B030402005)资助 （2007B030402005）
