数字图像分析在地震定位数据中的应用
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摘要
针对地震分布点状图不能有效地显示复杂震源区地震构造的几何形态问题,利用网格化插值和二维小波变换方法处理了地震定位数据,得到震源空间分布图像和发震时间图像.对图像进行分析可以更直观地反映地震构造走向、倾向和发震时间的平面分布特征.将方法应用于实际资料的处理,并且对研究区的图像进行了地震构造解释.结果表明,研究区发震构造时间和空间特征为明显的北西方向,另外还存在断续的北东向特征,与该区域地质构造和其他资料分析结果较为一致.
In order to solve the problem of earthquake distribution point-diagram.no effectively displaying the 3D geometry of the seismic structure in complex hypocenter area,gridding interpolation and 2-D wavelet transformation are used for processing hypocenter location data,and spatial hypocenter distribution image and seism starting time image are obtained.The images display the strike direction and the dip direction of seismic structure and the plane distribution character of seism starting time.The factual seismic data is processed using this method,and the images of the studied area are interpreted.The result shows the time and spatial features of the seismic structure present obvious NW strike and discontinuous NE strike.And this result relatively accords with the geologic structure of this area and the analysis results according to other data.
In order to solve the problem of earthquake distribution point-diagram.no effectively displaying the 3D geometry of the seismic structure in complex hypocenter area,gridding interpolation and 2-D wavelet transformation are used for processing hypocenter location data,and spatial hypocenter distribution image and seism starting time image are obtained.The images display the strike direction and the dip direction of seismic structure and the plane distribution character of seism starting time.The factual seismic data is processed using this method,and the images of the studied area are interpreted.The result shows the time and spatial features of the seismic structure present obvious NW strike and discontinuous NE strike.And this result relatively accords with the geologic structure of this area and the analysis results according to other data.
引文
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[16]祝治平,张建狮,张先康,等.张北—尚义地震区壳幔构造[J].中国地震,1999,15(1):65-73.
[17]赖晓玲,张先康,成双喜,等.张家口—渤海断裂带西缘壳幔过渡带研究[J].地球物理学报,2004,47(5):798-804
[2]Gaillot P,Darrozes J,Courjault-Rade P,et al.Structuralanalysis of hypocentral distribution of an earthquake se-quence using anisotropic wavelets:method and application[J].Geophys,Res,2002,107(B10):1-14.
[3]Chapman M C,Powell C A,Vlahovic G,et al.A statisticalanalysis of earthquake focal mechanisms and epicenter lo-cation in the Eastern Tennessee Seismic Zone[J].BullSeism Soc Am,1997,87(6):1522-1536.
[4]Gaillot P,Darrozes J,Saint-Blanquat M,et al.The nor-malized optimized anisotropic wavelet coefficient(NOAWC)method:an image processing tool for multi-scale analysis of rock fabric[J].Geophys Res Lett,1997,24(14):1819-1822.
[5]张国民,李丽,焦明若.张北6.2级地震与强震成组活动[J].地震,1999,19(2):107-117.
[6]徐锡伟,冉勇康,周本刚,等.张北—尚义地震的地震构造环境与宏观破坏特征[J].地震地质,1998,20(2):135-145.
[7]王超,刘智,张红,等.张北—尚义地震同震形变场雷达差分干涉测量[J].科学通报,2000,45(23):2 550-2 554.
[8]刁桂苓,蔡华昌,刁建新,等.1998年张北6.2级地震宏观烈度[J].华北地震科学,2001,19(1):32-30.
[9]高景春,刁桂苓,张四昌,等.以震源精确定位结果分析张北地震序列的破裂特征[J].地震地质,2002,24(1):81-90.
[10]石金虎,赖晓玲,段永红,等.张北地震近场观测资料的初步解释[J].中国地震,1999,15(2):151-158.
[11]赖晓玲,李松林,张先康,等.张北地震区三维构造特征[J].地学前缘,2002,9(4):383-388.
[12]赖晓玲,张先康,李松林.张北近场资料处理及震源区地震分布三维图像[J].地球物理学进展,2002,17(1):61-70.
[13]刘若新,孙建中,樊祺城,等.新生代岩浆分布[A].马杏垣主编.中国岩石圈动力学地图集[C].北京:中国地图出版社,1989:13.
[14]杨理华,刘德林,赵喜柱,等.北京、天津、河北地震构造[A].马杏垣主编.中国岩石圈动力学地图集[C].北京:中国地图出版社,1989:30.
[15]车用太,刘五洲,王基华,等.张北—尚义地震典型地段的地表破坏[J].地震地质,1998,20(2):179-182.
[16]祝治平,张建狮,张先康,等.张北—尚义地震区壳幔构造[J].中国地震,1999,15(1):65-73.
[17]赖晓玲,张先康,成双喜,等.张家口—渤海断裂带西缘壳幔过渡带研究[J].地球物理学报,2004,47(5):798-804
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