张家口—渤海地震活动带中东段地壳剪切波分裂研究
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摘要
张家口—渤海地震活动带是我国华北地区一条重要的地震带。该区域的主压应力场方向为近EW向。本文利用2005年9月—2010年9月首都圈地区地震台站记录到的数字波形资料,采用SAM方法(剪切波分裂系统分析法),研究讨论张家口—渤海地震带中东段地壳介质各向异性的空间分布特征。结果显示:张渤活动带中部及以东区域总体的优势方向明显,为近EW方向。横跨张渤活动带两侧的快剪切波优势偏振方向的空间分布显示,地震带北侧燕山隆起区内、地震带范围内和地震带南侧华北盆地内的快剪切波优势偏振方向均为近EW方向,差异不大。
Zhangjiakou—Bohai seismic belt is an important seismic zone in North China.The direction of principal compressive stress is near EW in this region.According to digital seismic data from the Capital Region from September 2005 to September 2010,using the SAM method,the spatial distribution of the crust anisotropy characteristics were studied and discussed in the middle eastern part of the Zhangjiakou—Bohai seismic belt.The principle polarization direction,which is near EW direction,is obvious in middle eastern Zhangjiakou—Bohai seismic belt.The spatial distribution of polarization direction athwart the Zhangjiakou—Bohai seismic belt shows that there is little difference among the Yanshan uplift area,inside of the seismic zone and North China basin,and the principle polarization direction is in the direction of nearly EW.
Zhangjiakou—Bohai seismic belt is an important seismic zone in North China.The direction of principal compressive stress is near EW in this region.According to digital seismic data from the Capital Region from September 2005 to September 2010,using the SAM method,the spatial distribution of the crust anisotropy characteristics were studied and discussed in the middle eastern part of the Zhangjiakou—Bohai seismic belt.The principle polarization direction,which is near EW direction,is obvious in middle eastern Zhangjiakou—Bohai seismic belt.The spatial distribution of polarization direction athwart the Zhangjiakou—Bohai seismic belt shows that there is little difference among the Yanshan uplift area,inside of the seismic zone and North China basin,and the principle polarization direction is in the direction of nearly EW.
引文
[1]徐杰,宋长青,楚全芝.张家口—蓬莱断裂带地震构造特性的初步探讨[J].地震地质,1998,20(2):146-154.
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[3]张红艳,谢富仁,崔效锋,等.张渤带陆地段现代构造应力场的非均匀特征[J].中国地震,2009,25(3):314-324.
[4]邓起东,张培震.中国活动构造基本特征[J].中国科学(D辑),2002,32(12):1020-1030.
[5]Crampin S,Chastin S.A review of shear-wave splitting in the crack-critical crust[J],Geophys J Int,2003,155:221-240
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[7]Margheriti L,Ferulano M F,Bona M D.Seismic anisotropy and its relation with crust structure andstress field in the Reggio Emilia Region(Northern Italy)[J].Geophys J Int,2006,167:1 035-1 043.
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[9]石玉涛,高原,昊晶,等.云南地区地壳介质各向异性—快剪切波偏振特性[J].地震学报,2006,28(6):574-585.
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[11]太龄雪,高原,石玉涛,等.辽宁区域地震台网的地壳剪切波分裂研究[J].地震地质,2009,31(3):401-414.
[12]赵博,高原,石玉涛,等.张家口—渤海地震带与山西地震带交汇区的地壳剪切波分裂[J].地球物理学报,2011,54(6):1517-1527.
[13]高原,刘希强,梁维,等.剪切波系统分裂方法(SAM)软件系统[J].中国地震,2004,20(1):101-107.
[14]高原,石玉涛,梁维,等.剪切波分裂分析系统SAM(2007)[J].中国地震,2008,24(4),345-353.
[15]郑秀芬,欧阳飚,张东宁,等.“国家数字测震台网数据备份中心”技术系统建设及其对汶川大地震研究的数据支撑[J].地球物理学报,2009,52(5):1412-1417.
[16]Crampin S,Peacock S.A review of shear-wave splitting in the compliant crack-critical anisotropicEarth[J].Wave Motion,2005,41:59-77
[17]赖院根,刘启元,陈九辉,等.首都圈地区横波分裂与地壳应力场特征[J].地球物理学报,2006,49(1):189-196.
[18]汪一鹏,邓起东,朱世龙.华北地区岩石圈动力学特征[A],中国岩石圈动力学图集[C].北京:中国地图出版社,1989.
[19]许忠淮.东亚地区现今构造应力图的编制[J].地震学报,2001,23(5):492-501.
[20]张国民,马宏生,王辉,等.中国大陆活动地块边界带与强震活动[J].地球物理学报,2005,48(3):602-610.
[2]王若柏,顾国华,徐杰,等.张家口—渤海地震构造带的地壳形变研究[J].地震地质,2004,26(4):586-596.
[3]张红艳,谢富仁,崔效锋,等.张渤带陆地段现代构造应力场的非均匀特征[J].中国地震,2009,25(3):314-324.
[4]邓起东,张培震.中国活动构造基本特征[J].中国科学(D辑),2002,32(12):1020-1030.
[5]Crampin S,Chastin S.A review of shear-wave splitting in the crack-critical crust[J],Geophys J Int,2003,155:221-240
[6]Crampin S.Effective anisotropic elastic constants for wave propagation through cracked solids[J].Geophys J R Astonsoc,1984,76:135-145.
[7]Margheriti L,Ferulano M F,Bona M D.Seismic anisotropy and its relation with crust structure andstress field in the Reggio Emilia Region(Northern Italy)[J].Geophys J Int,2006,167:1 035-1 043.
[8]高原,郑斯华,周蕙兰.唐山地区快剪切波偏振图像及其变化[J].地球物理学报,1999,42(2):228-232.
[9]石玉涛,高原,昊晶,等.云南地区地壳介质各向异性—快剪切波偏振特性[J].地震学报,2006,28(6):574-585.
[10]吴晶,高原,陈运泰,等.首都圈西北部地区地壳介质地震各向异性特征初步研究[J].地球物理学报,2007,50(1):209-220.
[11]太龄雪,高原,石玉涛,等.辽宁区域地震台网的地壳剪切波分裂研究[J].地震地质,2009,31(3):401-414.
[12]赵博,高原,石玉涛,等.张家口—渤海地震带与山西地震带交汇区的地壳剪切波分裂[J].地球物理学报,2011,54(6):1517-1527.
[13]高原,刘希强,梁维,等.剪切波系统分裂方法(SAM)软件系统[J].中国地震,2004,20(1):101-107.
[14]高原,石玉涛,梁维,等.剪切波分裂分析系统SAM(2007)[J].中国地震,2008,24(4),345-353.
[15]郑秀芬,欧阳飚,张东宁,等.“国家数字测震台网数据备份中心”技术系统建设及其对汶川大地震研究的数据支撑[J].地球物理学报,2009,52(5):1412-1417.
[16]Crampin S,Peacock S.A review of shear-wave splitting in the compliant crack-critical anisotropicEarth[J].Wave Motion,2005,41:59-77
[17]赖院根,刘启元,陈九辉,等.首都圈地区横波分裂与地壳应力场特征[J].地球物理学报,2006,49(1):189-196.
[18]汪一鹏,邓起东,朱世龙.华北地区岩石圈动力学特征[A],中国岩石圈动力学图集[C].北京:中国地图出版社,1989.
[19]许忠淮.东亚地区现今构造应力图的编制[J].地震学报,2001,23(5):492-501.
[20]张国民,马宏生,王辉,等.中国大陆活动地块边界带与强震活动[J].地球物理学报,2005,48(3):602-610.
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