利用人工地震研究福建地壳一维速度结构
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摘要
速度结构模型对于地震定位、理论波形计算等具有重要意义。本文基于福建数字地震台网台站对2010年至2012年在福建地区进行的人工地震探测试验得到的震相数据,利用射线追踪原理,得到福建地区地壳一维速度结构模型,结晶层厚约为3.5 km,P波速度为5.47 km/s,上地壳厚度约为15.5 km,P波速度为6.09 km/s,下地壳厚度约为12.5 km,P波速度为6.78 km/s,莫霍面P波速度为8.07 km/s,地壳厚度约为31.5 km。将结果与其它研究结果对比,验证本文结果的可靠性。
Velocity structure model is significant in earthquake location,synthetic waveforms calculation,and so on. In this paper,based on the analysis of the artificial earthquake phase data obtained from seismic network of Fujian from 2010 to 2012,the 1-D crust velocity structure model in Fujian region has been obtained by using the ray tracing principle. The model is about 31. 5km thick composed of three layers which are crystalline layer,upper crust,lower crust. The parameters of the model are H0= 3. 5 km,VP 0= 5. 47 km / s,H1= 15. 5 km,VP 1= 6. 09 km / s,H2= 12. 5 km,VP 2= 6. 78 km / s,VP n= 8. 07 km / s. Compared with other research results,it is shown the reliability of the results in this paper.
Velocity structure model is significant in earthquake location,synthetic waveforms calculation,and so on. In this paper,based on the analysis of the artificial earthquake phase data obtained from seismic network of Fujian from 2010 to 2012,the 1-D crust velocity structure model in Fujian region has been obtained by using the ray tracing principle. The model is about 31. 5km thick composed of three layers which are crystalline layer,upper crust,lower crust. The parameters of the model are H0= 3. 5 km,VP 0= 5. 47 km / s,H1= 15. 5 km,VP 1= 6. 09 km / s,H2= 12. 5 km,VP 2= 6. 78 km / s,VP n= 8. 07 km / s. Compared with other research results,it is shown the reliability of the results in this paper.
引文
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[3]王椿镛,韩渭宾,吴建平,等.松潘-甘孜造山带地壳速度结构[J].地震学报,2003,25(3):229-241.WANG Chunyong,HAN Weibin WU Jianping,et al.Crustal structure beneath the Songpan-Ganzi orogenic belt[J].Acta Seismologica Sinica,2003,25(3):229-241.(in Chinese)
[4]李清河,闵祥仪,郭健康,等.天水-礼县地区地壳速度结构[J].西北地震学报,1990,12(2):49-57.LI Qinghe,MIN Xiangyi,GUO Jiankang,et al.The crustal velocity structure in Tianshui-Lixian region[J].Northwestern Seismological Journal,1990,12(2):49-57.(in Chinese)
[5]廖其林,王振明,王屏路,等.福州-泉州-汕头地区地壳结构的爆破地震研究[J].地球物理学报,1988,31(3):270-280.LIAO Qilin,WANG Zhenming,WANG Pinglu,et al.Explosion seismic study of the crustal structure in Fuzhou-Quanzhou-Shantou region[J],Chinese Journal of Geophysics,1988,31(3):270~280.(in Chinese).
[6]廖其林,王振明,王屏路,等.我国华南沿海地区地壳与上地幔速度结构特征[J].科学通报,1987,32(12):933-935.LIAO Qilin,WANG Zhenming,WANG Pinglu,et al.The crust-upper mantle velocity structure of South China Coastal areas[J].Chinese Science Bulletin,1987,33(12):933-935.(in Chinese)
[7]范玉兰,林纪曾,胡瑞贺,等.华南地区近震走时表的研制[J].华南地震,1990,10(2):1-16.FAN Yulan,LIN Jizeng,HU Ruihe,et al.The development of travel timetable for near earthquake in South China[J].South China Journal of Seismology,1990,10(2):1-16.(in Chinese)
[8]袁丽文,郑斯华.用远震接收函数反演福建地区宽频带台站下方莫霍界面深度[J].华南地震,2009.29(3):85-97.YUAN Liwen ZHENG Sihua.Moho depths beneath broad-band stations in Fujian area inversed by teleseismic receiver function[J],South China Journal of Seismology,2009.29(3):85-97.(in Chinese)
[9]国家地震局科技监测司.中国大陆深部构造的研究与进展[M].北京:地质出版社,1988.Department of scientific programming and earthquake monitoring of State Seismological Bureau.The research process of deep structure in mainland China[M].Beijing:Geological publishing house.1988.(in Chinese)
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