晋冀蒙交界区瑞利波速随时间变化特征
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摘要
以冀晋蒙交界区为研究中心,利用2010年1月—2013年5月冀晋蒙交汇区部分数字地震观测台网资料,通过波形互相关,获取研究区内台站对之间瑞利波速度随时间的变化特征。结果表明,背景噪声互相关方法获取的相对地震波速度变化可用于监测地壳内部物性介质的变化,但在一定程度上受到季节变化影响。研究区瑞利波速度2011—2012年波动较大,可能是该时段环太平洋区强/大地震活动引起华北区应力场调整变化的反映,2013年后瑞利波速度变化基本在零值附近波动,表明研究区地下介质物性变化处于相对稳定阶段。
In this paper,we collect continue seismic wave data from broadband seismic stations deployed in the Shanxi Province-Heibei Province-Inner Mongolia cross area from January,2010 to May,2013.We use wave cross-correlation to measure the Rayleigh wave velocity changes between the station-pair.Our results show that this method can be used to monitor the medium changes of crustal.But it would be effect by the season variation.The Rayleigh wave velocity change presented large fluctuate during the year 2011 to 2012,which may relate to the strong earthquakes occurred around Pacific Rim during these time,and they in turn can cause the stress field adjustment in North China.After the year 2013,the curves of velocity fluctuation around zero may mean the study area underground medium property is in the stable stage,relatively.
引文
刘志坤。黄金莉.利用背景噪声互相关研究汶川地震震源区地震波速度变化[J].地球物理学报,2010,53(4):853-863,doi:10.3969/j.issn.0001-5733.2010.04.010.
    M7专项工作组.中国大陆大地震中—长期危险性研究[M].北京:地震出版社,2012.
    赵酚盼,陈九辉,刘启元,等.汶川地震区地壳速度相对变化的环境噪声自相关研究[J].地球物理学报,2012,55(1):137-145,doi:10.6038/j.issn.0001-5733.2012.01013.
    郑秀芬,欧阳飚,张东宁,姚志祥,梁建宏,郑洁.“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):1 412~1 417.doi:10.3969/j.issn.0001-5733.2009.05.031.
    Bensen G D,Ritzwoller M H,Barmin M P et al.Processing seismic ambient noise data to obtain reliable broad-band surface wave dispersion measurements[J].Geophys J Int,2007,169:1 239—1 260.doi:10.1111/j.1365-246X.2007.03374.x.
    Brenguier F,Campillo M,Hadziioannou C,Shapiro N M,Nadeau R M and Larose E.Postseismic relaxation along the San Andreas Fault at Parkfield from continuous seismological observations[J].Science,2008,321:1 478—1 481.
    Brenguier F,Shapiro N M,Campillo M et al.Towards forecasting volcanic eruptions using seismic noise[J],Nature Geoscience,2008,1:126-130.
    Campillo M and Paul A.Long-range correlations in the diffuse seismic coda[J].Science,2003,299:547—549.
    Chen J H,Froment B,Liu Q Y et al.Distribution of seismic wave speed changes associated with the 12 May 2008 M_w 7.9Wenchuan earthquake[J],Geophysics Res Lett,2012,37:L18302,doi:10.1029/2010GL044582.
    Niu F,Silver P G,Nadeau R M and McEvilly T V.Stress-Induced Migration of Seismic Scatterers Associated with the 1993Parkfield aseismic transient event[J].Nature,2003,426:544—548.
    Stehly L,Campillo M and Shapiro N M.Travel time measurements from noise correlation:Stability arid detection of instrumental errors[J].Geophys J Int,2007,171:223—230.
    Wegler U,Sens-Schonfelder C.Fault zone monitoring with Passive Image Interferometry[J].Geophys J Int,2007,168:1 029-1 033.
    Wegler U,Nakahara H,Sens-Sch(o|¨)nfelder C et al.Sudden drop of seismic velocity after the 2004 M_W 6.6 mid-Niigata earthquake,Japan,observed with Passive Image Interferometry[J].J Geophys Res,2009,114(B06305).
    Xu Z J,Song X D.Temporal changes of surface wave velocity associated with major Sumatra earthquakes from ambient noise correlation[J].PNAS,2009,106(34):14 207-14 212.
    Zhan Z,Claryton R W.Apparent velocity change caused by temporal variation of frequency content of ambient seismic noise[C].AGU,Fall Meeting,2010,abstract#S21D-08.

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