上海及其邻近地区三维地壳结构层析成像
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摘要
利用上海及其邻近地区地震台网的地震记录及人工爆破资料,采用地震层析成像方法反演研究区地壳三维P波、S波速度结构模型。成像结果表明:不同深度的P波、S波速度扰动呈北西向展布特征;地震大多数分布在低速区的块体内,说明地震不仅与断裂活动有关,有可能还与物质结构和性质有关;上海及其邻近地区上地壳速度结构,断裂活动和物质性质三者之间存在密切关系。
Using the local seismic events which were recorded by seismic networks of Shanghai and it's adjacent areas and some artificial blasting events,adopting seismic tomography method,the 3-D P,S wave crust velocity structure of this region is inversed.The tomographic images in different depths show that the P,S wave velocity perturbation orientates NW direction.Most of local earthquakes occurred in low velocity zones,it indicates that earthquake activity is not only related to active faults and maybe linked to crustal structure and its material property.There is a close relationship among velocity structure,active faults and upper crustal materials in Shanghai and its adjacent areas.
Using the local seismic events which were recorded by seismic networks of Shanghai and it's adjacent areas and some artificial blasting events,adopting seismic tomography method,the 3-D P,S wave crust velocity structure of this region is inversed.The tomographic images in different depths show that the P,S wave velocity perturbation orientates NW direction.Most of local earthquakes occurred in low velocity zones,it indicates that earthquake activity is not only related to active faults and maybe linked to crustal structure and its material property.There is a close relationship among velocity structure,active faults and upper crustal materials in Shanghai and its adjacent areas.
引文
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[2]Zhao D,Hasegawa A,Horiuchi S.Tomographic i maging of Pand S wave velocity structure beneath northeastern Japan[J].J.Geophys.Res.,1992,97:19909-19928.
[3]Zhao D,Kanamori H,Wiens D.State of stress before and af-ter the 1994 Northridge earthquakes[J].Geophys.Res.Lett.,1997,24:519-522.
[4]黄金莉,赵大鹏.美国南加州地壳、上地幔三维P波速度成像-莫霍面起伏的影响[J].地震学报,2003,25(6):563-573.
[5]黄金莉,赵大鹏.首都圈地区地壳三维P波速度细结构与强震孕育的深部构造环境[J].科学通报,2005,50(4):348-355.
[6]UmJ,Thurber C.Afast algorithmfor two-point seismic raytracing[J].Bull.Seism.Soc.Am.,1987,77:972-986
[7]Paige C,Saunders M.LSQR:An Algorithmfor sparse linearequations and sparse least squares[J].ACM Trans.Math.Software,1982,8:43-71.
[8]姚虹,腾吉文,孙克忠,等.苏浙皖地区地壳结构的初步研究[J].西北地震学报,1984,6(2):60-68.
[9]陈胜早.对中国东部苏、浙、皖区壳-幔结构的新认识[J].科学通报,1987,32:1016-1020,
[10]滕吉文,姚虹,孙克忠,等.中国东部马鞍山-常熟-启东地带地壳与上地幔结构和速度分布的爆炸地震研究[J].地球物理学报,1985,28(2)∶156-168.
[11]孙克忠,腾吉文,姚虹,等.江苏地区地壳结构的广义线性反演[J].地震研究.1985,8(2):159-167.
[12]郦逸根.浙江深部构造地球物理表征[J].浙江地质.2001,17(1):34-44.
[13]彭聪,高锐.中国大陆及邻近海域岩石圈/软流圈结构横向变化研究[M].北京:地震出版社,2000.97-98.
[14]章振铨,刘昌森,王锋.上海地区断裂活动性与地震关系初析[J].中国地震,2004,20(2):143-151.
[15]国家地震局《深部物探成果》编写组.中国地壳上地幔地球物理探测成果[M].北京:地震出版社,1986.328-361
[16]田建明,谢华章,等.江苏地区地震活动性图像的构造解释[J].地震地质,1996,18(3):251-257.
[17]江苏省地震局.江苏地震志[M].北京:地震出版社,1987.5-12
[18]王夫运,张先康,陈祺福,等.北京地区上地壳三维细结构层析成像[J].地球物理学报,2005,48(2):359-366.
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