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广东及其邻域的地壳厚度和泊松比分布
沈玉松1,2) 康英2) 徐果明1)
1)中国科学技术大学,合肥市金寨路96号 230026/2)广东省地震局,广州市先烈中路81号大院 510070
摘要:
利用广东及其邻域福建、江西、湖南、广西、海南、台湾共82个宽频带数字地震台的远震资料, 计算获得了所有台站下方的体波接收函数,并通过接收函数 搜索叠加方法反演了这些台站下方的地壳厚度和平均泊松比。研究结果表明,广东及周周边地区的地壳厚度介于26.8~33.6km之间,平均为29.5km。由西北到东南逐渐变薄,为大陆地壳向大洋地壳的缓慢过渡。珠江三角洲、粤西、粤桂琼交界、广西南宁、广东南澳地区地壳厚度较薄,为25.0-28.0km;海南的翁田、广东的湛江、上川岛地壳厚度最薄,在26km左右;福建明溪、湖南永州周边地区地壳厚度较厚、地壳厚度在31.0~34.0km间。研究区域内地壳泊松比为0.20~0.29,海南岛的东南部,粤东和闽西的沿海地区,以及江西南部具有明显的高泊松比,这可能与这些地区具有广泛的温泉分布和高热流值的特性有关。地壳厚度和泊松比的分布具有明显的分块特征,并与断层和历史地震的分布相关。
关键词:  接收函数  地壳厚度  泊松比
DOI:
分类号:
基金项目:
The Crustal Thickness and Poisson s Ratio Distribution in Guangdong and Its Adjacent Areas
Shen Yusong1,2),Kang Ying2) and Xu Guoming1)
1) The School of Earth and Space Science,University of Science and Technology of China,Hefei 230026,China/2) Earthquake Administration of Guangdong Province,Guangzhou 510070,China
Abstract:
Based on the teleseismic waveform data recorded by 82 permanent broadband stations in Guangdong Province and its adjacent areas including Fujian,Jiangxi,Hunan,Guangxi, Hainan and Taiwan,we calculate body wave receiver functions under all stations,and obtain the crustal thickness and average Poissons ratio beneath all stations by the H-κ stacking-search method of receiver function. The results show that the crustal thickness with an average thickness of 29. 5km in Guangdong Province and its adjacent areas ranges between 26. 8km and 33. 6km and gradually thins from northwest to southeast. The crustal thickness in the Zhujiang Delta,western Guangdong,Nanning and Nanao areas is relatively thinner and ranges between 25. 0km and 28. 0km. The minimum crustal thickness is about 26km beneath Wengtian,Hainan and the Zhanjiang zone and Shangchuan Island in Guangdong. The crustal thickness in the zones of Mingxi,Fujian and Yongzhou, Hunan is thicker and varies between 31. 0km and 34. 0km. The distribution of Poissons ratio in our study region ranges between 0. 20 and 0. 29. Poissons ratios in Southeast Hainan,the coastal areas of East Guangdong and West Fujian and the South Jiangxi have distinctly higher values than in others. It suggests that the various geothermal fields located in these areas have high heat flow values. The distribution of crustal thickness and Poissons ratio has an obvious block feature and may be related to the distribution of faults and historical earthquakes.
Key words:  Receiver function  Crustal thickness  Poisson's ratio