接收台阵、震源阵的传递函数与双聚束法的初步研究
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摘要
根据汶川地震序列,选出距离合适、波形相关性较好的事件作为震源阵,联合永久台阵(那曲、和田台阵),进行震源阵与固定台阵组合研究,计算其台阵响应。结果表明,地震序列可以形成震源阵,按照地震台阵的特殊方法进行研究,可以提高信噪比,为揭示地下精细结构提供条件。
According to the earthquake sequence after Wenchuan earthquake occurred on May 12,in 2008,we chose several groups of earthquakes as source arrays by the correlation character of the events.Naqu seismic array in Xizang Autonomous Region and Hetian seismic array in Xinjiang Uygur Autonomous Region were the receiver seismic arrays to be chosen.The array response functions were calculated for both receiver arrays and source arrays,and the transfer function equivalents for the double-beam configurations were also calculated.The results show that wenchuan earthquake sequence could form source arrays and these cheap arrays could be researched by the using of special array seismology methods.The transfer function equivalents for the double-beam configurations have higher resolutions in slowness field than the receiver arrays,which indicate the capability to disclose the smaller structure of the interior of the earth.
According to the earthquake sequence after Wenchuan earthquake occurred on May 12,in 2008,we chose several groups of earthquakes as source arrays by the correlation character of the events.Naqu seismic array in Xizang Autonomous Region and Hetian seismic array in Xinjiang Uygur Autonomous Region were the receiver seismic arrays to be chosen.The array response functions were calculated for both receiver arrays and source arrays,and the transfer function equivalents for the double-beam configurations were also calculated.The results show that wenchuan earthquake sequence could form source arrays and these cheap arrays could be researched by the using of special array seismology methods.The transfer function equivalents for the double-beam configurations have higher resolutions in slowness field than the receiver arrays,which indicate the capability to disclose the smaller structure of the interior of the earth.
引文
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郝春月,郑重,牟磊育.兰州台阵勘址测点对相干函数的计算与分析[J].地震地磁观测与研究,2002,23(4):29-33.
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Kr(u|¨)ger F,Baumann M,Weber M,et al.Double beam analysis of anomalies in the core-mantle boundary region[J].Geophys Res Lett,1993,20:1475-1478.
Scherbaum F,Kr(u|¨)ger F,Weber M.Double beam imaging:Mapping lower mantle heterogeneities using combinations of source and receiver arrays.J GeophysRes,1997,102(B1):507-522,doi:10.1029/96JB03115.
Sebastian Rost,Christine Thomas.Array seismology:Methods and applications[J].Reviews of Geophysics,2002,40(3): 1-27.
Yamazaki A,Hirahara K.The thickness of upper mantle discontinuities as inferred from short-period J Array data[J].Geophys Res lett,1994,21:1811-1814.
郝春月,牟磊育,马牧军,等.兰州台阵勘测点均方根值的计算与分析[J].地震地磁观测与研究,2003,24(5):54-57.
郝春月,郑重,牟磊育.兰州台阵勘址测点对相干函数的计算与分析[J].地震地磁观测与研究,2002,23(4):29-33.
李海鸥,姜枚,王有学,等.青藏高原地壳的低速层与部分熔融[J].物探与化探,2004,28(4):290-293.
李永华,吴庆举,安张辉,等.青藏高原东北缘地壳S波速度结构与泊松比及其意义[R].地球物理学报,2006,49(5): 1359-1368.
吴庆举,曾融生.用宽频带远震接收函数研究青藏高原的地壳结构[J].地球物理学报,1998,41(5):669-679.
吴庆举,曾融生,赵文津.喜马拉雅青藏高原的上地幔倾斜构造与陆—陆碰撞过程[J].中国科学(D辑),2004,34(10): 919-925.
许忠淮,汪素云,裴顺平.青藏高原东北缘地区Pn波速度的横向变化[J].地震学报,2003,25(1):24—31.
赵国泽,汤吉,詹艳,等.青藏高原东北缘地壳电性结构和地块变形关系的研究[J].中国科学(D辑),2004,34(10): 908-918.
周民都,吕太乙,张元生,等.青藏高原东北缘地质构造背景及地壳结构研究[J].地震学报,2000,22(6):645—653.
朱元清,佟玉霞,宋俊高.上海地震台阵的设计方法[J].地震地磁观测与研究,2002,23(2):13—23.
Kruger F,Baumann M,Scherbaum F,Weber M.Mid mantle scatterers near the Mariana Siab detected with a double array method[J].Geophys Res Lett,2001,28(4):667-670,doi:10.1029/2000GL011570.
Kr(u|¨)ger F,Scherbaum F,Weber M,Schlittenhardt J.Analysis of Asymmetric Multipathing with a Generalization of the Double-Beam Method[J].Bulletin of the Seismological Society of America,1996,86(3):737-749,
Kr(u|¨)ger F,Baumann M,Weber M,et al.Double beam analysis of anomalies in the core-mantle boundary region[J].Geophys Res Lett,1993,20:1475-1478.
Scherbaum F,Kr(u|¨)ger F,Weber M.Double beam imaging:Mapping lower mantle heterogeneities using combinations of source and receiver arrays.J GeophysRes,1997,102(B1):507-522,doi:10.1029/96JB03115.
Sebastian Rost,Christine Thomas.Array seismology:Methods and applications[J].Reviews of Geophysics,2002,40(3): 1-27.
Yamazaki A,Hirahara K.The thickness of upper mantle discontinuities as inferred from short-period J Array data[J].Geophys Res lett,1994,21:1811-1814.
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