伽师近场观测地震资料的三维Q值成像
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摘要
为了研究震源区介质的物性特征,利用振幅谱拟合和有限差分三维Q值成像方法处理了伽师地震区临时台网的地震波形资料,获得了该地震区上地壳的S波三维Q值图像。结果表明:不同深度的Q值图像都存在低Q值带,主要展布方向为EW向、NNE向和NNW向,与研究区的柯坪断裂、羊达曼断裂和麦盖提断裂有一定的对应关系,并且NNE向的低Q值带与强震群分布和余震分布的条带位置接近,推测低Q值带可能是震源区的几条深部断裂。
In order to investigate the properties of medium in the focal region of Jiashi earthquake, the seismic waveform data from the temporary seismostation network in the area were processed by use of the method of amplitude spectrum fitting and 3-D Q value tomography of finite difference and the S-wave’s Q value image of the uppercrust of the area was obtained.The results show that there is low Q belt in the Q value images of different depth,they spread in the EW,NNE and NWW directions and correspond well with the Keping,Yangdaman and Maigaiti faults.Besides,the NNE low Q belt is near to the belts in which the strong earthquake swarm and aftershokes occured.It can be infered that the low Q belts may be some deep faults in the area.
In order to investigate the properties of medium in the focal region of Jiashi earthquake, the seismic waveform data from the temporary seismostation network in the area were processed by use of the method of amplitude spectrum fitting and 3-D Q value tomography of finite difference and the S-wave’s Q value image of the uppercrust of the area was obtained.The results show that there is low Q belt in the Q value images of different depth,they spread in the EW,NNE and NWW directions and correspond well with the Keping,Yangdaman and Maigaiti faults.Besides,the NNE low Q belt is near to the belts in which the strong earthquake swarm and aftershokes occured.It can be infered that the low Q belts may be some deep faults in the area.
引文
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5 严又生,宜明理,魏新,等.井间地震速度和Q值联合层析成像及应用[J].石油地球物理勘探,2001,36(1):9～17.5 YanYousheng,YiMingli,WeiXin,etal.Jointtomograph icimagingforcross holeseismicvelocityandQvalue[J].OilGeophysicalProspecting,2001,36(1):9-17.(inChi nese)
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14 杨欣,龙海英.伽师巴楚强震群序列趋势的早期判断[J].内陆地震,2005,19(1):53～64.14 YangXinandLongHaiying.Earlydeterminationofthe Jiashi Bachustrongearthquakeclustersequencetrend[J].InlandEarthquake,2005,19(1):53-64.(inChinese)
15 曲延军,聂晓红.2003年巴楚伽师6.8级地震序列特征分析[J].内陆地震,2005,19(1):65～73.15 QuYanjunandNieXiaohong.Characteristicanalysisofthe Bachu JiashiM6.8earthquakesequence,Xinjiang,2003[J].InlandEarthquake,2005,19(1):65-73.(inChi nese)
16 王筱荣,孙甲宁,王季达.1997～2004年伽师地区6级地震序列特征研究[J].内陆地震,2005,19(1):44～52.16 WangXiaorong,SunJia’ningandWangJida.Characteris ticresearchofearthquakesequencewithmorethanMs6in Jishiareafrom1997to2004[J].InlandEarthquake,2005,19(1):44-52.(inChinese)
17 胡万秋,胡军,柏美祥,等.新疆地震构造[A].见:马杏垣主编,中国岩石圈动力学地图集[C].北京:地图出版社,1989.17 HuWanqiu,HuJun,BaiMeixiang,etal.Tectonicsetting ofseismologyofXinjiang[A].In:LithosphericDynamics AtlasofChina[C].Beijing:ChinaCartographicPublishing House,1989.(inChinese)
18 HoleJE.Nonlinearhight resolutionthree dimensional seismictraveltimetomography[J].J.Geophys.Res.,1982,87:6553-6562.
19 VidaleJE.Finite differencecalculationoftraveltimein three dimension[J].Geophysics,1990,55:521-526.
20 HumphreysEandClaytonRW.Adaptationofbackprojec tiontomographytoseismictraveltimeproblems[J].J.Geophys.Res.,1988,93:1073-1085.
21 赖晓玲,张先康,李松林,等.三维Q值层析成像方法[J].中国科学院研究生院学报,2002,19(4):357～361.21 Lai,Xiaoling,ZhangXiankang,LiSonglin,etal.Method forthree dimensionQ valuetomography[J].Journalofthe GraduateSchooloftheChineseAcademyofSciences.2002,19(4):357-361.(inChinese)
2 ClawsonSR,SmithRBandBendHM.Pwaveattenuation oftheYellowstonecalderafromthree dimensioninversionof spectraldecayusingexplosionsourceseismicdata[J].J.Geophys.Res.1989,94(B6):7205-7222.
3 GaoS.ABayesiannonlinearinversionofseismicbody-waveattenuationfactors[J].Bull.Seismol.Soc.Am.,1997,87(4):961-970.
4 LeesJMandLindleyGT.Three dimensionalattenuation tomographyatLomaPriete:Inversionoft forQ[J].J.Geophys.Res.1994,99(B4):6843-6863.
5 严又生,宜明理,魏新,等.井间地震速度和Q值联合层析成像及应用[J].石油地球物理勘探,2001,36(1):9～17.5 YanYousheng,YiMingli,WeiXin,etal.Jointtomograph icimagingforcross holeseismicvelocityandQvalue[J].OilGeophysicalProspecting,2001,36(1):9-17.(inChi nese)
6 朱令人,苏乃秦,杨马陵.1997年新疆伽师强震群及三次成功的临震预报[J].中国地震,1998,14(2):101～115.6 ZhuLingren,SuNaiqinandYangMaling.Activityofthe1997JiashistrongswarminXinjiangandthreesuccessful impendingprodictionforit[J].EarthquakeResearchin China,1998,14(2):101～115.(inChinese)
7 赵翠萍,顾瑾平,白彤霞.新疆伽师强震群震源应力环境分析[J].中国地震,2001,17(3):289～298.7 ZhaoCuiping,GuJinpingandBaiTongxia.Theanalysisof focalstressenvironmentofJiashistrongearthquakeswarms inXinjiang[J].EarthquakeResearchinChina,2001,17(3):289-298.(inChinese)
8 段永红,赖晓玲,李松林,等.新疆伽师地震的近场观测和对它的初步认识[J].地球物理学进展,1999,14(4):41～48.8 DuanYonghong,LaiXiaoling,LiSonglin,etal.Nearfield earthquakeobservationofJiashiandsomedeductionsof Jiashistrongearthquakes[J].ProgressinGeophysics,1999,14(4):41-48.(inChinese)
9 刘启元,陈九辉,李顺成,等.新疆伽师强震群区三维地壳上地幔S波速度结构及其地震成因的探讨[J].地球物理学报,2000,43(3):356～365.9 LiuQiyuan,ChenJiuhui,LiShuncheng,etal.Passive seismicexperimentinJiashistrongearthquakeregion,Xin jianganddiscussiononitsseismicgenesis[J].Chinese JournalofGeophysics,2000,43(3):356-365.(inChi nese)
10 周仕勇,许忠淮,陈晓非.伽师强震群震源特征及震源机制力学成因分析[J].地球物理学报,2001,44(5):654～662.10 ZhouShiyong,XuZhonghuaiandChenXiaofei.Analysis onthesourcecharacteristicsofthe1997Jiashiswarm,WesternChina[J].ChineseJournalofGeophysics,2001,44(5):654-662.(inChinese)
11 李松林,张先康,WDMooney,等.伽师地震区地壳细结构及发震断层的初步研究[J].地球物理学报,2002,45(1):76～82.11 LiSonglin,ZhangXiankang,MooneyWD,etal.Apre liminarystudyonfinestructureofJiashiearthquakeregion andseismicfault[J].ChineseJournalofGeophysics,2002,45(1):76-82.(inChinese)
12 赖晓玲,张先康,李松林.伽师近场地震资料处理———三维速度成像[J].中国科学院研究生院学报,2003,20(1):50～55.12 LaiXiaoling,ZhangXiankangandLiSonglin.Datapro cessingofnearfieldearthquakerecordsinJiashiEarth quakeRegion———3Dvelocitytomograthy[J].Journalof theGraduateSchooloftheChineseAcademyofSciences,2003,20(1):50-55.(inChinese)
13 高国英,杨又陵,温和平,等.2003年巴楚伽师6.8级地震中短期异常与预测[J].内陆地震,2005,19(1):22～29.13 GaoGuoying,YangYouling,WenHeping,etal.Medium shorttermanomaliesandpredictionofBachu JiashiM6.8earthquake,2003[J].InlandEarthquake,2005,19(1):22-29.(inChinese)
14 杨欣,龙海英.伽师巴楚强震群序列趋势的早期判断[J].内陆地震,2005,19(1):53～64.14 YangXinandLongHaiying.Earlydeterminationofthe Jiashi Bachustrongearthquakeclustersequencetrend[J].InlandEarthquake,2005,19(1):53-64.(inChinese)
15 曲延军,聂晓红.2003年巴楚伽师6.8级地震序列特征分析[J].内陆地震,2005,19(1):65～73.15 QuYanjunandNieXiaohong.Characteristicanalysisofthe Bachu JiashiM6.8earthquakesequence,Xinjiang,2003[J].InlandEarthquake,2005,19(1):65-73.(inChi nese)
16 王筱荣,孙甲宁,王季达.1997～2004年伽师地区6级地震序列特征研究[J].内陆地震,2005,19(1):44～52.16 WangXiaorong,SunJia’ningandWangJida.Characteris ticresearchofearthquakesequencewithmorethanMs6in Jishiareafrom1997to2004[J].InlandEarthquake,2005,19(1):44-52.(inChinese)
17 胡万秋,胡军,柏美祥,等.新疆地震构造[A].见:马杏垣主编,中国岩石圈动力学地图集[C].北京:地图出版社,1989.17 HuWanqiu,HuJun,BaiMeixiang,etal.Tectonicsetting ofseismologyofXinjiang[A].In:LithosphericDynamics AtlasofChina[C].Beijing:ChinaCartographicPublishing House,1989.(inChinese)
18 HoleJE.Nonlinearhight resolutionthree dimensional seismictraveltimetomography[J].J.Geophys.Res.,1982,87:6553-6562.
19 VidaleJE.Finite differencecalculationoftraveltimein three dimension[J].Geophysics,1990,55:521-526.
20 HumphreysEandClaytonRW.Adaptationofbackprojec tiontomographytoseismictraveltimeproblems[J].J.Geophys.Res.,1988,93:1073-1085.
21 赖晓玲,张先康,李松林,等.三维Q值层析成像方法[J].中国科学院研究生院学报,2002,19(4):357～361.21 Lai,Xiaoling,ZhangXiankang,LiSonglin,etal.Method forthree dimensionQ valuetomography[J].Journalofthe GraduateSchooloftheChineseAcademyofSciences.2002,19(4):357-361.(inChinese)
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